HConstants (Apache HBase 2.0.6 API)

java.lang.Object
- org.apache.hadoop.hbase.HConstants

@InterfaceAudience.Public
public final class HConstants
extends Object

HConstants holds a bunch of HBase-related constants

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class HConstants.OperationStatusCode
Status codes used for return values of bulk operations.

Nested Classes
Modifier and Type	Class and Description
`static class`	`HConstants.OperationStatusCode` Status codes used for return values of bulk operations.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`ADMIN_QOS`
`static int`	`ALL_VERSIONS` Define for 'return-all-versions'.
`static String`	`BASE_NAMESPACE_DIR`
`static String`	`BUCKET_CACHE_IOENGINE_KEY` Current ioengine options in include: heap, offheap and file:PATH (where PATH is the path to the file that will host the file-based cache.
`static String`	`BUCKET_CACHE_SIZE_KEY` When using bucket cache, this is a float that EITHER represents a percentage of total heap memory size to give to the cache (if < 1.0) OR, it is the capacity in megabytes of the cache.
`static String`	`BULKLOAD_MAX_RETRIES_NUMBER` Maximum time to retry for a failed bulk load request
`static String`	`BULKLOAD_STAGING_DIR_NAME` Staging dir used by bulk load
`static String`	`BYTES_PER_CHECKSUM` The name of the configuration parameter that specifies the number of bytes in a newly created checksum chunk.
`static byte[]`	`CATALOG_FAMILY` The catalog family
`static String`	`CATALOG_FAMILY_STR` The catalog family as a string
`static String`	`CHECKSUM_TYPE_NAME` The name of the configuration parameter that specifies the name of an algorithm that is used to compute checksums for newly created blocks.
`static String`	`CIPHER_AES` Default cipher for encryption
`static String`	`CLIENT_PORT_STR` The ZK client port key in the ZK properties map.
`static String`	`CLUSTER_DISTRIBUTED` Cluster is in distributed mode or not
`static String`	`CLUSTER_ID_DEFAULT` Default value for cluster ID
`static String`	`CLUSTER_ID_FILE_NAME` name of the file for unique cluster ID
`static boolean`	`CLUSTER_IS_DISTRIBUTED` Deprecated.
`static boolean`	`CLUSTER_IS_LOCAL` Cluster is standalone or pseudo-distributed
`static String`	`COMPACTION_KV_MAX` Parameter name for the maximum batch of KVs to be used in flushes and compactions
`static int`	`COMPACTION_KV_MAX_DEFAULT`
`static String`	`CONFIGURATION`
`static String`	`CORRUPT_DIR_NAME`
`static String`	`CP_HTD_ATTR_INCLUSION_KEY`
`static Pattern`	`CP_HTD_ATTR_KEY_PATTERN` Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
`static String`	`CP_HTD_ATTR_VALUE_PARAM_KEY_PATTERN` Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
`static Pattern`	`CP_HTD_ATTR_VALUE_PARAM_PATTERN` Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
`static String`	`CP_HTD_ATTR_VALUE_PARAM_VALUE_PATTERN` Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
`static Pattern`	`CP_HTD_ATTR_VALUE_PATTERN` Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
`static String`	`CRYPTO_ALTERNATE_KEY_ALGORITHM_CONF_KEY` Configuration key for the name of the alternate cipher algorithm for the cluster, a string
`static String`	`CRYPTO_CIPHERPROVIDER_CONF_KEY` Configuration key for the crypto algorithm provider, a class name
`static String`	`CRYPTO_KEY_ALGORITHM_CONF_KEY` Configuration key for the algorithm used for creating jks key, a string
`static String`	`CRYPTO_KEYPROVIDER_CONF_KEY` Configuration key for the crypto key provider, a class name
`static String`	`CRYPTO_KEYPROVIDER_PARAMETERS_KEY` Configuration key for the crypto key provider parameters
`static String`	`CRYPTO_MASTERKEY_ALTERNATE_NAME_CONF_KEY` Configuration key for the name of the alternate master key for the cluster, a string
`static String`	`CRYPTO_MASTERKEY_NAME_CONF_KEY` Configuration key for the name of the master key for the cluster, a string
`static String`	`CRYPTO_WAL_ALGORITHM_CONF_KEY` Configuration key for the algorithm to use when encrypting the WAL, a string
`static String`	`CRYPTO_WAL_KEY_NAME_CONF_KEY` Configuration key for the name of the master WAL encryption key for the cluster, a string
`static String`	`DATA_FILE_UMASK_KEY` File permission umask to use when creating hbase data files
`static int`	`DAY_IN_SECONDS` Seconds in a day, hour and minute
`static int`	`DEFAULT_BLOCKSIZE` Default block size for an HFile.
`static boolean`	`DEFAULT_CLUSTER_DISTRIBUTED` Default value for cluster distributed mode
`static UUID`	`DEFAULT_CLUSTER_ID` Default cluster ID, cannot be used to identify a cluster so a key with this value means it wasn't meant for replication.
`static boolean`	`DEFAULT_ENABLE_CLIENT_BACKPRESSURE`
`static int`	`DEFAULT_HBASE_BALANCER_PERIOD` Default value for the balancer period
`static int`	`DEFAULT_HBASE_CLIENT_MAX_PERREGION_TASKS` Default value of `HBASE_CLIENT_MAX_PERREGION_TASKS`.
`static int`	`DEFAULT_HBASE_CLIENT_MAX_PERSERVER_TASKS` Default value of `HBASE_CLIENT_MAX_PERSERVER_TASKS`.
`static int`	`DEFAULT_HBASE_CLIENT_MAX_TOTAL_TASKS` Default value of `HBASE_CLIENT_MAX_TOTAL_TASKS`.
`static int`	`DEFAULT_HBASE_CLIENT_OPERATION_TIMEOUT` Default HBase client operation timeout, which is tantamount to a blocking call
`static long`	`DEFAULT_HBASE_CLIENT_PAUSE` Default value of `HBASE_CLIENT_PAUSE`.
`static int`	`DEFAULT_HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD` Default value of `HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD`.
`static int`	`DEFAULT_HBASE_CLIENT_RETRIES_NUMBER` Default value of `HBASE_CLIENT_RETRIES_NUMBER`.
`static int`	`DEFAULT_HBASE_CLIENT_SCANNER_CACHING` Default value for `HBASE_CLIENT_SCANNER_CACHING`
`static long`	`DEFAULT_HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE` Maximum number of bytes returned when calling a scanner's next method.
`static int`	`DEFAULT_HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD` Default value of `HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD`.
`static int`	`DEFAULT_HBASE_CLIENT_SERVERSIDE_RETRIES_MULTIPLIER`
`static double`	`DEFAULT_HBASE_MASTER_BALANCER_MAX_RIT_PERCENT` Default value for the max percent of regions in transition
`static int`	`DEFAULT_HBASE_META_BLOCK_SIZE` Default value of `HBASE_META_BLOCK_SIZE`.
`static int`	`DEFAULT_HBASE_META_SCANNER_CACHING` Default value of `HBASE_META_SCANNER_CACHING`.
`static int`	`DEFAULT_HBASE_META_VERSIONS` Default value of `HBASE_META_VERSIONS`.
`static int`	`DEFAULT_HBASE_RPC_SHORTOPERATION_TIMEOUT` Default value of `HBASE_RPC_SHORTOPERATION_TIMEOUT_KEY`
`static int`	`DEFAULT_HBASE_RPC_TIMEOUT` Default value of `HBASE_RPC_TIMEOUT_KEY`
`static int`	`DEFAULT_HBASE_SERVER_PAUSE` Default value of `HBASE_SERVER_PAUSE`.
`static long`	`DEFAULT_HBASE_SERVER_SCANNER_MAX_RESULT_SIZE` Maximum number of bytes returned when calling a scanner's next method.
`static int`	`DEFAULT_HEALTH_FAILURE_THRESHOLD`
`static long`	`DEFAULT_HEALTH_SCRIPT_TIMEOUT`
`static float`	`DEFAULT_HEAP_OCCUPANCY_HIGH_WATERMARK`
`static float`	`DEFAULT_HEAP_OCCUPANCY_LOW_WATERMARK`
`static String`	`DEFAULT_HOST` default host address
`static boolean`	`DEFAULT_HREGION_EDITS_REPLAY_SKIP_ERRORS`
`static int`	`DEFAULT_HREGION_MEMSTORE_BLOCK_MULTIPLIER` Default value for hbase.hregion.memstore.block.multiplier
`static int`	`DEFAULT_HSTORE_OPEN_AND_CLOSE_THREADS_MAX` The default number for the max number of threads used for opening and closing stores or store files in parallel
`static String`	`DEFAULT_LOSSY_COUNTING_ERROR_RATE`
`static float`	`DEFAULT_MAJOR_COMPACTION_JITTER`
`static long`	`DEFAULT_MAJOR_COMPACTION_PERIOD`
`static int`	`DEFAULT_MASTER_HANLDER_COUNT` Deprecated.
`static int`	`DEFAULT_MASTER_INFOPORT` default port for master web api
`static int`	`DEFAULT_MASTER_PORT` default port that the master listens on
`static boolean`	`DEFAULT_MASTER_TYPE_BACKUP` by default every master is a possible primary master unless the conf explicitly overrides it
`static long`	`DEFAULT_MAX_FILE_SIZE` Default maximum file size
`static int`	`DEFAULT_META_REPLICA_NUM`
`static double`	`DEFAULT_REGION_SERVER_HANDLER_ABORT_ON_ERROR_PERCENT`
`static int`	`DEFAULT_REGION_SERVER_HANDLER_COUNT`
`static int`	`DEFAULT_REGION_SERVER_HIGH_PRIORITY_HANDLER_COUNT`
`static int`	`DEFAULT_REGION_SERVER_REPLICATION_HANDLER_COUNT`
`static int`	`DEFAULT_REGIONSERVER_INFOPORT` default port for region server web api
`static long`	`DEFAULT_REGIONSERVER_METRICS_PERIOD`
`static int`	`DEFAULT_REGIONSERVER_PORT` Default port region server listens on.
`static String`	`DEFAULT_SNAPSHOT_RESTORE_FAILSAFE_NAME`
`static boolean`	`DEFAULT_SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT`
`static String`	`DEFAULT_STATUS_MULTICAST_ADDRESS`
`static String`	`DEFAULT_STATUS_MULTICAST_BIND_ADDRESS`
`static int`	`DEFAULT_STATUS_MULTICAST_PORT`
`static String`	`DEFAULT_STATUS_MULTICAST_PUBLISHER_BIND_ADDRESS`
`static String`	`DEFAULT_TEMPORARY_HDFS_DIRECTORY`
`static int`	`DEFAULT_THREAD_WAKE_FREQUENCY` Default value for thread wake frequency
`static boolean`	`DEFAULT_USE_META_REPLICAS`
`static int`	`DEFAULT_VERSION_FILE_WRITE_ATTEMPTS` Parameter name for how often we should try to write a version file, before failing
`static String`	`DEFAULT_WAL_STORAGE_POLICY` By default we defer the WAL storage policy to HDFS
`static int`	`DEFAULT_ZK_SESSION_TIMEOUT` Default value for ZooKeeper session timeout
`static String`	`DEFAULT_ZOOKEEPER_ZNODE_PARENT`
`static int`	`DEFAULT_ZOOKEPER_CLIENT_PORT` Default client port that the zookeeper listens on
`static int`	`DEFAULT_ZOOKEPER_MAX_CLIENT_CNXNS` Default limit on concurrent client-side zookeeper connections
`static long`	`DEFAULT_ZOOKEPER_RECOVERABLE_WAITIME` Deprecated.
`static String`	`DEFER_TO_HDFS_STORAGE_POLICY` "NONE" is not a valid storage policy and means we defer the policy to HDFS.
`static int`	`DELIMITER` delimiter used between portions of a region name
`static byte[]`	`EMPTY_BYTE_ARRAY` An empty instance.
`static ByteBuffer`	`EMPTY_BYTE_BUFFER`
`static byte[]`	`EMPTY_END_ROW` Last row in a table.
`static byte[]`	`EMPTY_START_ROW` Used by scanners, etc when they want to start at the beginning of a region
`static String`	`ENABLE_CLIENT_BACKPRESSURE` Config key for if the server should send backpressure and if the client should listen to that backpressure from the server
`static String`	`ENABLE_DATA_FILE_UMASK` Enable file permission modification from standard hbase
`static String`	`ENABLE_WAL_COMPRESSION` Configuration name of WAL Compression
`static String`	`ENABLE_WAL_ENCRYPTION` Configuration key for enabling WAL encryption, a boolean
`static TableName`	`ENSEMBLE_TABLE_NAME` The name of the ensemble table
`static String`	`FILE_SYSTEM_VERSION` Current version of file system.
`static int`	`FOREVER` Unlimited time-to-live.
`static String`	`HBASE_BALANCER_MAX_BALANCING` Config for the max balancing time
`static String`	`HBASE_BALANCER_PERIOD` Config for the balancer period
`static String`	`HBASE_CANARY_READ_RAW_SCAN_KEY`
`static String`	`HBASE_CANARY_WRITE_DATA_TTL_KEY` Canary config keys
`static String`	`HBASE_CANARY_WRITE_PERSERVER_REGIONS_LOWERLIMIT_KEY`
`static String`	`HBASE_CANARY_WRITE_PERSERVER_REGIONS_UPPERLIMIT_KEY`
`static String`	`HBASE_CANARY_WRITE_TABLE_CHECK_PERIOD_KEY`
`static String`	`HBASE_CANARY_WRITE_VALUE_SIZE_KEY`
`static String`	`HBASE_CHECKSUM_VERIFICATION` If this parameter is set to true, then hbase will read data and then verify checksums.
`static boolean`	`HBASE_CLIENT_ENABLE_FAST_FAIL_MODE_DEFAULT`
`static long`	`HBASE_CLIENT_FAST_FAIL_CLEANUP_DURATION_MS_DEFAULT`
`static String`	`HBASE_CLIENT_FAST_FAIL_CLEANUP_MS_DURATION_MS`
`static String`	`HBASE_CLIENT_FAST_FAIL_INTERCEPTOR_IMPL`
`static String`	`HBASE_CLIENT_FAST_FAIL_MODE_ENABLED` Config for enabling/disabling the fast fail mode.
`static String`	`HBASE_CLIENT_FAST_FAIL_THREASHOLD_MS`
`static long`	`HBASE_CLIENT_FAST_FAIL_THREASHOLD_MS_DEFAULT`
`static String`	`HBASE_CLIENT_INSTANCE_ID` Parameter name for unique identifier for this `Configuration` instance.
`static String`	`HBASE_CLIENT_IPC_POOL_SIZE` Parameter name for HBase client IPC pool size
`static String`	`HBASE_CLIENT_IPC_POOL_TYPE` Parameter name for HBase client IPC pool type
`static String`	`HBASE_CLIENT_MAX_PERREGION_TASKS` The maximum number of concurrent connections the client will maintain to a single Region.
`static String`	`HBASE_CLIENT_MAX_PERSERVER_TASKS` The maximum number of concurrent connections the client will maintain to a single RegionServer.
`static String`	`HBASE_CLIENT_MAX_TOTAL_TASKS` The maximum number of concurrent connections the client will maintain.
`static String`	`HBASE_CLIENT_META_OPERATION_TIMEOUT` Parameter name for HBase client meta operation timeout.
`static String`	`HBASE_CLIENT_META_REPLICA_SCAN_TIMEOUT` Parameter name for HBase client meta replica scan call timeout.
`static int`	`HBASE_CLIENT_META_REPLICA_SCAN_TIMEOUT_DEFAULT` Default HBase client meta replica scan call timeout, 1 second
`static String`	`HBASE_CLIENT_OPERATION_TIMEOUT` Parameter name for HBase client operation timeout.
`static String`	`HBASE_CLIENT_PAUSE` Parameter name for client pause value, used mostly as value to wait before running a retry of a failed get, region lookup, etc.
`static String`	`HBASE_CLIENT_PAUSE_FOR_CQTBE` Parameter name for client pause value for special case such as call queue too big, etc.
`static String`	`HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD` The maximum number of concurrent pending RPC requests for one server in process level.
`static String`	`HBASE_CLIENT_RETRIES_NUMBER` Parameter name for maximum retries, used as maximum for all retryable operations such as fetching of the root region from root region server, getting a cell's value, starting a row update, etc.
`static String`	`HBASE_CLIENT_SCANNER_CACHING` Parameter name to set the default scanner caching for all clients.
`static String`	`HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE_KEY` Parameter name for maximum number of bytes returned when calling a scanner's next method.
`static String`	`HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD` The client scanner timeout period in milliseconds.
`static String`	`HBASE_CLIENT_SERVERSIDE_RETRIES_MULTIPLIER`
`static float`	`HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD`
`static String`	`HBASE_DIR` Parameter name for HBase instance root directory
`static String`	`HBASE_MASTER_BALANCER_MAX_RIT_PERCENT` Config for the max percent of regions in transition
`static String`	`HBASE_MASTER_LOADBALANCE_BYTABLE` Config for balancing the cluster by table
`static String`	`HBASE_MASTER_LOADBALANCER_CLASS` Config for pluggable load balancers
`static String`	`HBASE_MASTER_LOGCLEANER_PLUGINS`
`static String`	`HBASE_MASTER_NORMALIZER_CLASS` Config for pluggable region normalizer
`static String`	`HBASE_META_BLOCK_SIZE` Parameter name for number of versions, kept by meta table.
`static String`	`HBASE_META_SCANNER_CACHING` Parameter name for number of rows that will be fetched when calling next on a scanner if it is not served from memory.
`static String`	`HBASE_META_VERSIONS` Parameter name for number of versions, kept by meta table.
`static List<String>`	`HBASE_NON_TABLE_DIRS` Directories that are not HBase table directories
`static List<String>`	`HBASE_NON_USER_TABLE_DIRS` Directories that are not HBase user table directories
`static String`	`HBASE_REGION_SPLIT_POLICY_KEY`
`static String`	`HBASE_REGIONSERVER_LEASE_PERIOD_KEY` Deprecated. This config option is deprecated. Will be removed at later releases after 0.96.
`static String`	`HBASE_RPC_READ_TIMEOUT_KEY` timeout for each read RPC
`static String`	`HBASE_RPC_SHORTOPERATION_TIMEOUT_KEY` timeout for short operation RPC
`static String`	`HBASE_RPC_TIMEOUT_KEY` timeout for each RPC
`static String`	`HBASE_RPC_WRITE_TIMEOUT_KEY` timeout for each write RPC
`static String`	`HBASE_RS_NONCES_ENABLED` Whether nonces are enabled; default is true.
`static String`	`HBASE_SERVER_PAUSE` Parameter name for server pause value, used mostly as value to wait before running a retry of a failed operation.
`static String`	`HBASE_SERVER_SCANNER_MAX_RESULT_SIZE_KEY` Parameter name for maximum number of bytes returned when calling a scanner's next method.
`static String`	`HBASE_SPLITLOG_MANAGER_TIMEOUT` Configuration key for SplitLog manager timeout
`static String`	`HBASE_TEMP_DIRECTORY` Temporary directory used for table creation and deletion
`static String`	`HBASECLIENT_IMPL` Deprecated.
`static String`	`HBCK_CODE_NAME` Deprecated.
`static String`	`HBCK_SIDELINEDIR_NAME` Used by HBCK to sideline backup data
`static String`	`HEALTH_CHORE_WAKE_FREQ`
`static String`	`HEALTH_FAILURE_THRESHOLD` The maximum number of health check failures a server can encounter consecutively.
`static String`	`HEALTH_SCRIPT_LOC` Health script related settings.
`static String`	`HEALTH_SCRIPT_TIMEOUT`
`static String`	`HEAP_OCCUPANCY_HIGH_WATERMARK_KEY`
`static String`	`HEAP_OCCUPANCY_LOW_WATERMARK_KEY`
`static String`	`HFILE_ARCHIVE_DIRECTORY` Directory under /hbase where archived hfiles are stored
`static float`	`HFILE_BLOCK_CACHE_SIZE_DEFAULT`
`static String`	`HFILE_BLOCK_CACHE_SIZE_KEY` Configuration key for the size of the block cache
`static byte[]`	`HFILEBLOCK_DUMMY_HEADER` Just an array of bytes of the right size.
`static int`	`HFILEBLOCK_HEADER_SIZE` The size of a version 2 HFile block header, minor version 1.
`static int`	`HFILEBLOCK_HEADER_SIZE_NO_CHECKSUM` The size data structures with minor version is 0
`static int`	`HIGH_QOS`
`static int`	`HOUR_IN_SECONDS`
`static String`	`HREGION_COMPACTIONDIR_NAME` Used to construct the name of the compaction directory during compaction
`static String`	`HREGION_EDITS_REPLAY_SKIP_ERRORS`
`static String`	`HREGION_LOGDIR_NAME` Used to construct the name of the log directory for a region server
`static String`	`HREGION_MAX_FILESIZE` Conf key for the max file size after which we split the region
`static String`	`HREGION_MEMSTORE_BLOCK_MULTIPLIER` Block updates if memstore has hbase.hregion.memstore.block.multiplier times hbase.hregion.memstore.flush.size bytes.
`static String`	`HREGION_MEMSTORE_FLUSH_SIZE` Conf key for the memstore size at which we flush the memstore
`static String`	`HREGION_OLDLOGDIR_NAME` Like the previous, but for old logs that are about to be deleted
`static String`	`HSTORE_OPEN_AND_CLOSE_THREADS_MAX` The max number of threads used for opening and closing stores or store files in parallel
`static String`	`IN_MEMORY`
`static int`	`INDEX_KEY_MAGIC` Used as a magic return value while optimized index key feature enabled(HBASE-7845)
`static String`	`KEEP_SEQID_PERIOD` Parameter name for # days to keep MVCC values during a major compaction
`static String`	`KEY_FOR_HOSTNAME_SEEN_BY_MASTER`
`static byte[]`	`LAST_ROW` Used by scanners and others when they're trying to detect the end of a table
`static long`	`LATEST_TIMESTAMP` Timestamp to use when we want to refer to the latest cell.
`static byte[]`	`LATEST_TIMESTAMP_BYTES` LATEST_TIMESTAMP in bytes form
`static String`	`LIB_DIR` Deprecated.
`static String`	`LOAD_BALANCER_SLOP_KEY`
`static String`	`LOCALHOST` Host name of the local machine
`static String`	`LOCALHOST_IP`
`static String`	`LOG_REPLAY_WAIT_REGION_TIMEOUT` Deprecated.
`static String`	`MAJOR_COMPACTION_JITTER` Parameter name and default value for major compaction jitter.
`static String`	`MAJOR_COMPACTION_PERIOD` Parameter name and default value for how often a region should perform a major compaction
`static int`	`MASTER__META_TRANSITION_HANDLER_COUNT_DEFAULT`
`static String`	`MASTER_HANDLER_COUNT` Deprecated.
`static String`	`MASTER_IMPL` Parameter name for what master implementation to use.
`static String`	`MASTER_INFO_PORT` Configuration key for master web API port
`static String`	`MASTER_META_TRANSITION_HANDLER_COUNT`
`static String`	`MASTER_PORT` Parameter name for port master listens on.
`static String`	`MASTER_TYPE_BACKUP` Parameter name for the master type being backup (waits for primary to go inactive).
`static int`	`MAX_ROW_LENGTH` Max length a row can have because of the limitation in TFile.
`static int`	`MAXIMUM_VALUE_LENGTH` Maximum value length, enforced on KeyValue construction
`static byte[]`	`MERGE_QUALIFIER_PREFIX`
`static String`	`MERGE_QUALIFIER_PREFIX_STR` Merge qualifier prefix.
`static byte[]`	`MERGEA_QUALIFIER` Deprecated. Since 2.3.0 and 2.2.1. Not used anymore. Instead we look for the `MERGE_QUALIFIER_PREFIX_STR` prefix.
`static byte[]`	`MERGEB_QUALIFIER` Deprecated. Since 2.3.0 and 2.2.1. Not used anymore. Instead we look for the `MERGE_QUALIFIER_PREFIX_STR` prefix.
`static int`	`META_QOS`
`static String`	`META_REPLICAS_NUM`
`static int`	`META_ROW_DELIMITER` delimiter used between portions of a region name
`static short`	`META_VERSION` The current version of the meta table.
`static byte[]`	`META_VERSION_QUALIFIER` The meta table version column qualifier.
`static String`	`METADATA`
`static String`	`METRICS_RIT_STUCK_WARNING_THRESHOLD` Region in Transition metrics threshold time
`static String`	`MIGRATION_NAME` Any artifacts left from migration can be moved here
`static int`	`MIN_KEEP_SEQID_PERIOD` At least to keep MVCC values in hfiles for 5 days
`static int`	`MINUTE_IN_SECONDS`
`static String`	`NAME`
`static String`	`NINES`
`static long`	`NO_NONCE`
`static long`	`NO_SEQNUM` Value indicating the server name was saved with no sequence number.
`static int`	`NORMAL_QOS`
`static String`	`NOT_IMPLEMENTED`
`static String`	`OLD_SNAPSHOT_DIR_NAME`
`static long`	`OLDEST_TIMESTAMP` Deprecated. Should not be public since hbase-1.3.0. For internal use only. Move internal to Scanners flagged as special timestamp value never to be returned as timestamp on a Cell.
`static int`	`PRIORITY_UNSET` QOS attributes: these attributes are used to demarcate RPC call processing by different set of handlers.
`static int`	`QOS_THRESHOLD`
`static String`	`RECOVERED_EDITS_DIR`
`static String`	`REGION_IMPL`
`static String`	`REGION_SERVER_HANDLER_ABORT_ON_ERROR_PERCENT`
`static String`	`REGION_SERVER_HANDLER_COUNT`
`static String`	`REGION_SERVER_HIGH_PRIORITY_HANDLER_COUNT`
`static String`	`REGION_SERVER_IMPL` Parameter name for what region server implementation to use.
`static String`	`REGION_SERVER_REPLICATION_HANDLER_COUNT`
`static String`	`REGION_SPLIT_THREADS_MAX` The max number of threads used for splitting storefiles in parallel during the region split process.
`static byte[]`	`REGIONINFO_QUALIFIER` The regioninfo column qualifier
`static String`	`REGIONINFO_QUALIFIER_STR` The RegionInfo qualifier as a string
`static String`	`REGIONSERVER_INFO_PORT` A configuration key for regionserver info port
`static String`	`REGIONSERVER_INFO_PORT_AUTO` A flag that enables automatic selection of regionserver info port
`static String`	`REGIONSERVER_METRICS_PERIOD` The period (in milliseconds) between computing region server point in time metrics
`static String`	`REGIONSERVER_PORT` Parameter name for port region server listens on.
`static int`	`REPLAY_QOS`
`static boolean`	`REPLICATION_BULKLOAD_ENABLE_DEFAULT`
`static String`	`REPLICATION_BULKLOAD_ENABLE_KEY`
`static String`	`REPLICATION_CLUSTER_ID` Replication cluster id of source cluster which uniquely identifies itself with peer cluster
`static String`	`REPLICATION_CODEC_CONF_KEY` Configuration key for setting replication codec class name
`static String`	`REPLICATION_CONF_DIR` Directory where the source cluster file system client configuration are placed which is used by sink cluster to copy HFiles from source cluster file system
`static String`	`REPLICATION_DROP_ON_DELETED_TABLE_KEY` Drop edits for tables that been deleted from the replication source and target
`static int`	`REPLICATION_QOS`
`static int`	`REPLICATION_SCOPE_GLOBAL` Scope tag for globally scoped data.
`static int`	`REPLICATION_SCOPE_LOCAL` Scope tag for locally scoped data.
`static String`	`REPLICATION_SERVICE_CLASSNAME_DEFAULT`
`static String`	`REPLICATION_SINK_SERVICE_CLASSNAME`
`static int`	`REPLICATION_SOURCE_MAXTHREADS_DEFAULT` Maximum number of threads used by the replication source for shipping edits to the sinks
`static String`	`REPLICATION_SOURCE_MAXTHREADS_KEY` Maximum number of threads used by the replication source for shipping edits to the sinks
`static String`	`REPLICATION_SOURCE_SERVICE_CLASSNAME`
`static int`	`REPLICATION_SOURCE_TOTAL_BUFFER_DFAULT`
`static String`	`REPLICATION_SOURCE_TOTAL_BUFFER_KEY` Max total size of buffered entries in all replication peers.
`static int[]`	`RETRY_BACKOFF` Retrying we multiply hbase.client.pause setting by what we have in this array until we run out of array items.
`static String`	`RPC_CODEC_CONF_KEY` Configuration key for setting RPC codec class name
`static byte`	`RPC_CURRENT_VERSION`
`static byte[]`	`RPC_HEADER` The first four bytes of Hadoop RPC connections
`static byte[]`	`SEQNUM_QUALIFIER` The open seqnum column qualifier
`static String`	`SEQNUM_QUALIFIER_STR` The open seqnum column qualifier
`static byte[]`	`SERVER_QUALIFIER` The server column qualifier
`static String`	`SERVER_QUALIFIER_STR` The server column qualifier
`static byte[]`	`SERVERNAME_QUALIFIER`
`static String`	`SERVERNAME_QUALIFIER_STR` The serverName column qualifier.
`static String`	`SNAPSHOT_DIR_NAME` Name of the directory to store all snapshots.
`static String`	`SNAPSHOT_RESTORE_FAILSAFE_NAME`
`static String`	`SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT`
`static int`	`SOCKET_RETRY_WAIT_MS` The delay when re-trying a socket operation in a loop (HBASE-4712)
`static String`	`SPLIT_LOGDIR_NAME` Used to construct the name of the splitlog directory for a region server
`static byte[]`	`SPLITA_QUALIFIER` The lower-half split region column qualifier
`static byte[]`	`SPLITB_QUALIFIER` The upper-half split region column qualifier
`static byte[]`	`STARTCODE_QUALIFIER` The startcode column qualifier
`static String`	`STARTCODE_QUALIFIER_STR` The startcode column qualifier
`static byte[]`	`STATE_QUALIFIER`
`static String`	`STATE_QUALIFIER_STR` The state column qualifier
`static String`	`STATUS_MULTICAST_ADDRESS` IP to use for the multicast status messages between the master and the clients.
`static String`	`STATUS_MULTICAST_BIND_ADDRESS` The address to use for binding the local socket for receiving multicast.
`static String`	`STATUS_MULTICAST_NI_NAME` The network interface name to use for the multicast messages.
`static String`	`STATUS_MULTICAST_PORT` The port to use for the multicast messages.
`static String`	`STATUS_MULTICAST_PUBLISHER_BIND_ADDRESS` The address to use for binding the local socket for sending multicast.
`static String`	`STATUS_PUBLISHED` Setting to activate, or not, the publication of the status by the master.
`static boolean`	`STATUS_PUBLISHED_DEFAULT`
`static int`	`SYSTEMTABLE_QOS`
`static byte[]`	`TABLE_FAMILY` The catalog family
`static String`	`TABLE_FAMILY_STR` The catalog family as a string
`static long`	`TABLE_MAX_ROWSIZE_DEFAULT` Default max row size (1 Gb).
`static String`	`TABLE_MAX_ROWSIZE_KEY` Max size of single row for Get's or Scan's without in-row scanning flag set.
`static byte[]`	`TABLE_STATE_QUALIFIER` The serialized table state qualifier
`static String`	`TEMPORARY_FS_DIRECTORY_KEY` Config key for hbase temporary directory in hdfs
`static String`	`THREAD_WAKE_FREQUENCY` Parameter name for how often threads should wake up
`static String`	`USE_META_REPLICAS` Conf key for enabling meta replication
`static Charset`	`UTF8_CHARSET` When we encode strings, we always specify UTF8 encoding
`static String`	`UTF8_ENCODING` When we encode strings, we always specify UTF8 encoding
`static String`	`VERSION_FILE_NAME` name of version file
`static String`	`VERSION_FILE_WRITE_ATTEMPTS` Parameter name for how often we should try to write a version file, before failing
`static String`	`VERSIONS`
`static String`	`WAL_STORAGE_POLICY` Configuration name of WAL storage policy Valid values are: HOT, COLD, WARM, ALL_SSD, ONE_SSD, LAZY_PERSIST See http://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html
`static int`	`WEEK_IN_SECONDS` Deprecated.
`static Long`	`ZERO_L` long constant for zero
`static String`	`ZEROES`
`static String`	`ZK_CFG_PROPERTY_PREFIX` Common prefix of ZooKeeper configuration properties
`static int`	`ZK_CFG_PROPERTY_PREFIX_LEN`
`static String`	`ZK_CLIENT_KERBEROS_PRINCIPAL`
`static String`	`ZK_CLIENT_KEYTAB_FILE` Configuration keys for programmatic JAAS configuration for secured ZK interaction
`static String`	`ZK_SERVER_KERBEROS_PRINCIPAL`
`static String`	`ZK_SERVER_KEYTAB_FILE`
`static String`	`ZK_SESSION_TIMEOUT` Configuration key for ZooKeeper session timeout
`static String`	`ZOOKEEPER_CLIENT_PORT` Parameter name for the client port that the zookeeper listens on
`static String`	`ZOOKEEPER_DATA_DIR` Parameter name for the ZK data directory
`static String`	`ZOOKEEPER_MAX_CLIENT_CNXNS` Parameter name for the limit on concurrent client-side zookeeper connections
`static String`	`ZOOKEEPER_QUORUM` Name of ZooKeeper quorum configuration parameter.
`static String`	`ZOOKEEPER_RECOVERABLE_WAITTIME` Deprecated.
`static String`	`ZOOKEEPER_TICK_TIME` Parameter name for the ZK tick time
`static String`	`ZOOKEEPER_ZNODE_PARENT` Parameter name for the root dir in ZK for this cluster

Constructor Summary

Constructors
Modifier Constructor and Description

private HConstants()

Constructors
Modifier	Constructor and Description
`private`	`HConstants()`

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - UTF8_ENCODING
```
public static final String UTF8_ENCODING
```
    When we encode strings, we always specify UTF8 encoding
    
    See Also:
    
    Constant Field Values
  - UTF8_CHARSET
```
public static final Charset UTF8_CHARSET
```
    When we encode strings, we always specify UTF8 encoding
  - DEFAULT_BLOCKSIZE
```
public static final int DEFAULT_BLOCKSIZE
```
    Default block size for an HFile.
    
    See Also:
    
    Constant Field Values
  - INDEX_KEY_MAGIC
```
public static final int INDEX_KEY_MAGIC
```
    Used as a magic return value while optimized index key feature enabled(HBASE-7845)
    
    See Also:
    
    Constant Field Values
  - RECOVERED_EDITS_DIR
```
public static final String RECOVERED_EDITS_DIR
```
    See Also:
    
    Constant Field Values
  - RPC_HEADER
```
public static final byte[] RPC_HEADER
```
    The first four bytes of Hadoop RPC connections
  - RPC_CURRENT_VERSION
```
public static final byte RPC_CURRENT_VERSION
```
    See Also:
    
    Constant Field Values
  - HFILEBLOCK_HEADER_SIZE_NO_CHECKSUM
```
public static final int HFILEBLOCK_HEADER_SIZE_NO_CHECKSUM
```
    The size data structures with minor version is 0
    
    See Also:
    
    Constant Field Values
  - HFILEBLOCK_HEADER_SIZE
```
public static final int HFILEBLOCK_HEADER_SIZE
```
    The size of a version 2 HFile block header, minor version 1. There is a 1 byte checksum type, followed by a 4 byte bytesPerChecksum followed by another 4 byte value to store sizeofDataOnDisk.
    
    See Also:
    
    Constant Field Values
  - HFILEBLOCK_DUMMY_HEADER
```
public static final byte[] HFILEBLOCK_DUMMY_HEADER
```
    Just an array of bytes of the right size.
  - ZERO_L
```
public static final Long ZERO_L
```
    long constant for zero
  - NINES
```
public static final String NINES
```
    See Also:
    
    Constant Field Values
  - ZEROES
```
public static final String ZEROES
```
    See Also:
    
    Constant Field Values
  - VERSION_FILE_NAME
```
public static final String VERSION_FILE_NAME
```
    name of version file
    
    See Also:
    
    Constant Field Values
  - FILE_SYSTEM_VERSION
```
public static final String FILE_SYSTEM_VERSION
```
    Current version of file system. Version 4 supports only one kind of bloom filter. Version 5 changes versions in catalog table regions. Version 6 enables blockcaching on catalog tables. Version 7 introduces hfile -- hbase 0.19 to 0.20.. Version 8 introduces namespace
    
    See Also:
    
    Constant Field Values
  - CLUSTER_DISTRIBUTED
```
public static final String CLUSTER_DISTRIBUTED
```
    Cluster is in distributed mode or not
    
    See Also:
    
    Constant Field Values
  - HBASE_MASTER_LOADBALANCER_CLASS
```
public static final String HBASE_MASTER_LOADBALANCER_CLASS
```
    Config for pluggable load balancers
    
    See Also:
    
    Constant Field Values
  - HBASE_MASTER_LOADBALANCE_BYTABLE
```
public static final String HBASE_MASTER_LOADBALANCE_BYTABLE
```
    Config for balancing the cluster by table
    
    See Also:
    
    Constant Field Values
  - HBASE_MASTER_BALANCER_MAX_RIT_PERCENT
```
public static final String HBASE_MASTER_BALANCER_MAX_RIT_PERCENT
```
    Config for the max percent of regions in transition
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_MASTER_BALANCER_MAX_RIT_PERCENT
```
public static final double DEFAULT_HBASE_MASTER_BALANCER_MAX_RIT_PERCENT
```
    Default value for the max percent of regions in transition
    
    See Also:
    
    Constant Field Values
  - HBASE_BALANCER_MAX_BALANCING
```
public static final String HBASE_BALANCER_MAX_BALANCING
```
    Config for the max balancing time
    
    See Also:
    
    Constant Field Values
  - HBASE_BALANCER_PERIOD
```
public static final String HBASE_BALANCER_PERIOD
```
    Config for the balancer period
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_BALANCER_PERIOD
```
public static final int DEFAULT_HBASE_BALANCER_PERIOD
```
    Default value for the balancer period
    
    See Also:
    
    Constant Field Values
  - ENSEMBLE_TABLE_NAME
```
public static final TableName ENSEMBLE_TABLE_NAME
```
    The name of the ensemble table
  - HBASE_MASTER_NORMALIZER_CLASS
```
public static final String HBASE_MASTER_NORMALIZER_CLASS
```
    Config for pluggable region normalizer
    
    See Also:
    
    Constant Field Values
  - CLUSTER_IS_LOCAL
```
public static final boolean CLUSTER_IS_LOCAL
```
    Cluster is standalone or pseudo-distributed
    
    See Also:
    
    Constant Field Values
  - CLUSTER_IS_DISTRIBUTED
```
@Deprecated
public static final boolean CLUSTER_IS_DISTRIBUTED
```
    Deprecated.
    
    Cluster is fully-distributed
    
    See Also:
    
    Constant Field Values
  - DEFAULT_CLUSTER_DISTRIBUTED
```
public static final boolean DEFAULT_CLUSTER_DISTRIBUTED
```
    Default value for cluster distributed mode
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HOST
```
public static final String DEFAULT_HOST
```
    default host address
    
    See Also:
    
    Constant Field Values
  - MASTER_PORT
```
public static final String MASTER_PORT
```
    Parameter name for port master listens on.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MASTER_PORT
```
public static final int DEFAULT_MASTER_PORT
```
    default port that the master listens on
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MASTER_INFOPORT
```
public static final int DEFAULT_MASTER_INFOPORT
```
    default port for master web api
    
    See Also:
    
    Constant Field Values
  - MASTER_INFO_PORT
```
public static final String MASTER_INFO_PORT
```
    Configuration key for master web API port
    
    See Also:
    
    Constant Field Values
  - MASTER_TYPE_BACKUP
```
public static final String MASTER_TYPE_BACKUP
```
    Parameter name for the master type being backup (waits for primary to go inactive).
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MASTER_TYPE_BACKUP
```
public static final boolean DEFAULT_MASTER_TYPE_BACKUP
```
    by default every master is a possible primary master unless the conf explicitly overrides it
    
    See Also:
    
    Constant Field Values
  - ZOOKEEPER_QUORUM
```
public static final String ZOOKEEPER_QUORUM
```
    Name of ZooKeeper quorum configuration parameter.
    
    See Also:
    
    Constant Field Values
  - ZK_CFG_PROPERTY_PREFIX
```
public static final String ZK_CFG_PROPERTY_PREFIX
```
    Common prefix of ZooKeeper configuration properties
    
    See Also:
    
    Constant Field Values
  - ZK_CFG_PROPERTY_PREFIX_LEN
```
public static final int ZK_CFG_PROPERTY_PREFIX_LEN
```
  - CLIENT_PORT_STR
```
public static final String CLIENT_PORT_STR
```
    The ZK client port key in the ZK properties map. The name reflects the fact that this is not an HBase configuration key.
    
    See Also:
    
    Constant Field Values
  - ZOOKEEPER_CLIENT_PORT
```
public static final String ZOOKEEPER_CLIENT_PORT
```
    Parameter name for the client port that the zookeeper listens on
    
    See Also:
    
    Constant Field Values
  - DEFAULT_ZOOKEPER_CLIENT_PORT
```
public static final int DEFAULT_ZOOKEPER_CLIENT_PORT
```
    Default client port that the zookeeper listens on
    
    See Also:
    
    Constant Field Values
  - ZOOKEEPER_RECOVERABLE_WAITTIME
```
@Deprecated
public static final String ZOOKEEPER_RECOVERABLE_WAITTIME
```
    Deprecated.
    
    Parameter name for the wait time for the recoverable zookeeper
    
    See Also:
    
    Constant Field Values
  - DEFAULT_ZOOKEPER_RECOVERABLE_WAITIME
```
@Deprecated
public static final long DEFAULT_ZOOKEPER_RECOVERABLE_WAITIME
```
    Deprecated.
    
    Default wait time for the recoverable zookeeper
    
    See Also:
    
    Constant Field Values
  - ZOOKEEPER_ZNODE_PARENT
```
public static final String ZOOKEEPER_ZNODE_PARENT
```
    Parameter name for the root dir in ZK for this cluster
    
    See Also:
    
    Constant Field Values
  - DEFAULT_ZOOKEEPER_ZNODE_PARENT
```
public static final String DEFAULT_ZOOKEEPER_ZNODE_PARENT
```
    See Also:
    
    Constant Field Values
  - ZOOKEEPER_MAX_CLIENT_CNXNS
```
public static final String ZOOKEEPER_MAX_CLIENT_CNXNS
```
    Parameter name for the limit on concurrent client-side zookeeper connections
    
    See Also:
    
    Constant Field Values
  - ZOOKEEPER_DATA_DIR
```
public static final String ZOOKEEPER_DATA_DIR
```
    Parameter name for the ZK data directory
    
    See Also:
    
    Constant Field Values
  - ZOOKEEPER_TICK_TIME
```
public static final String ZOOKEEPER_TICK_TIME
```
    Parameter name for the ZK tick time
    
    See Also:
    
    Constant Field Values
  - DEFAULT_ZOOKEPER_MAX_CLIENT_CNXNS
```
public static final int DEFAULT_ZOOKEPER_MAX_CLIENT_CNXNS
```
    Default limit on concurrent client-side zookeeper connections
    
    See Also:
    
    Constant Field Values
  - ZK_SESSION_TIMEOUT
```
public static final String ZK_SESSION_TIMEOUT
```
    Configuration key for ZooKeeper session timeout
    
    See Also:
    
    Constant Field Values
  - DEFAULT_ZK_SESSION_TIMEOUT
```
public static final int DEFAULT_ZK_SESSION_TIMEOUT
```
    Default value for ZooKeeper session timeout
    
    See Also:
    
    Constant Field Values
  - REGIONSERVER_PORT
```
public static final String REGIONSERVER_PORT
```
    Parameter name for port region server listens on.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_REGIONSERVER_PORT
```
public static final int DEFAULT_REGIONSERVER_PORT
```
    Default port region server listens on.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_REGIONSERVER_INFOPORT
```
public static final int DEFAULT_REGIONSERVER_INFOPORT
```
    default port for region server web api
    
    See Also:
    
    Constant Field Values
  - REGIONSERVER_INFO_PORT
```
public static final String REGIONSERVER_INFO_PORT
```
    A configuration key for regionserver info port
    
    See Also:
    
    Constant Field Values
  - REGIONSERVER_INFO_PORT_AUTO
```
public static final String REGIONSERVER_INFO_PORT_AUTO
```
    A flag that enables automatic selection of regionserver info port
    
    See Also:
    
    Constant Field Values
  - REGION_SERVER_IMPL
```
public static final String REGION_SERVER_IMPL
```
    Parameter name for what region server implementation to use.
    
    See Also:
    
    Constant Field Values
  - MASTER_IMPL
```
public static final String MASTER_IMPL
```
    Parameter name for what master implementation to use.
    
    See Also:
    
    Constant Field Values
  - HBASECLIENT_IMPL
```
@Deprecated
public static final String HBASECLIENT_IMPL
```
    Deprecated.
    
    Parameter name for what hbase client implementation to use.
    
    See Also:
    
    Constant Field Values
  - THREAD_WAKE_FREQUENCY
```
public static final String THREAD_WAKE_FREQUENCY
```
    Parameter name for how often threads should wake up
    
    See Also:
    
    Constant Field Values
  - DEFAULT_THREAD_WAKE_FREQUENCY
```
public static final int DEFAULT_THREAD_WAKE_FREQUENCY
```
    Default value for thread wake frequency
    
    See Also:
    
    Constant Field Values
  - VERSION_FILE_WRITE_ATTEMPTS
```
public static final String VERSION_FILE_WRITE_ATTEMPTS
```
    Parameter name for how often we should try to write a version file, before failing
    
    See Also:
    
    Constant Field Values
  - DEFAULT_VERSION_FILE_WRITE_ATTEMPTS
```
public static final int DEFAULT_VERSION_FILE_WRITE_ATTEMPTS
```
    Parameter name for how often we should try to write a version file, before failing
    
    See Also:
    
    Constant Field Values
  - MAJOR_COMPACTION_PERIOD
```
public static final String MAJOR_COMPACTION_PERIOD
```
    Parameter name and default value for how often a region should perform a major compaction
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MAJOR_COMPACTION_PERIOD
```
public static final long DEFAULT_MAJOR_COMPACTION_PERIOD
```
    See Also:
    
    Constant Field Values
  - MAJOR_COMPACTION_JITTER
```
public static final String MAJOR_COMPACTION_JITTER
```
    Parameter name and default value for major compaction jitter. Used as a multiplier applied to MAJOR_COMPACTION_PERIOD to cause compaction to occur a given amount of time either side of MAJOR_COMPACTION_PERIOD. Default to 0.5 so jitter has us fall evenly either side of when the compaction should run.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MAJOR_COMPACTION_JITTER
```
public static final float DEFAULT_MAJOR_COMPACTION_JITTER
```
    See Also:
    
    Constant Field Values
  - COMPACTION_KV_MAX
```
public static final String COMPACTION_KV_MAX
```
    Parameter name for the maximum batch of KVs to be used in flushes and compactions
    
    See Also:
    
    Constant Field Values
  - COMPACTION_KV_MAX_DEFAULT
```
public static final int COMPACTION_KV_MAX_DEFAULT
```
    See Also:
    
    Constant Field Values
  - HBASE_DIR
```
public static final String HBASE_DIR
```
    Parameter name for HBase instance root directory
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_IPC_POOL_TYPE
```
public static final String HBASE_CLIENT_IPC_POOL_TYPE
```
    Parameter name for HBase client IPC pool type
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_IPC_POOL_SIZE
```
public static final String HBASE_CLIENT_IPC_POOL_SIZE
```
    Parameter name for HBase client IPC pool size
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_OPERATION_TIMEOUT
```
public static final String HBASE_CLIENT_OPERATION_TIMEOUT
```
    Parameter name for HBase client operation timeout.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_META_OPERATION_TIMEOUT
```
public static final String HBASE_CLIENT_META_OPERATION_TIMEOUT
```
    Parameter name for HBase client meta operation timeout.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_OPERATION_TIMEOUT
```
public static final int DEFAULT_HBASE_CLIENT_OPERATION_TIMEOUT
```
    Default HBase client operation timeout, which is tantamount to a blocking call
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_META_REPLICA_SCAN_TIMEOUT
```
public static final String HBASE_CLIENT_META_REPLICA_SCAN_TIMEOUT
```
    Parameter name for HBase client meta replica scan call timeout.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_META_REPLICA_SCAN_TIMEOUT_DEFAULT
```
public static final int HBASE_CLIENT_META_REPLICA_SCAN_TIMEOUT_DEFAULT
```
    Default HBase client meta replica scan call timeout, 1 second
    
    See Also:
    
    Constant Field Values
  - HREGION_LOGDIR_NAME
```
public static final String HREGION_LOGDIR_NAME
```
    Used to construct the name of the log directory for a region server
    
    See Also:
    
    Constant Field Values
  - SPLIT_LOGDIR_NAME
```
public static final String SPLIT_LOGDIR_NAME
```
    Used to construct the name of the splitlog directory for a region server
    
    See Also:
    
    Constant Field Values
  - HREGION_OLDLOGDIR_NAME
```
public static final String HREGION_OLDLOGDIR_NAME
```
    Like the previous, but for old logs that are about to be deleted
    
    See Also:
    
    Constant Field Values
  - BULKLOAD_STAGING_DIR_NAME
```
public static final String BULKLOAD_STAGING_DIR_NAME
```
    Staging dir used by bulk load
    
    See Also:
    
    Constant Field Values
  - CORRUPT_DIR_NAME
```
public static final String CORRUPT_DIR_NAME
```
    See Also:
    
    Constant Field Values
  - HBCK_SIDELINEDIR_NAME
```
public static final String HBCK_SIDELINEDIR_NAME
```
    Used by HBCK to sideline backup data
    
    See Also:
    
    Constant Field Values
  - MIGRATION_NAME
```
public static final String MIGRATION_NAME
```
    Any artifacts left from migration can be moved here
    
    See Also:
    
    Constant Field Values
  - LIB_DIR
```
@Deprecated
public static final String LIB_DIR
```
    Deprecated.
    
    The directory from which co-processor/custom filter jars can be loaded dynamically by the region servers. This value can be overridden by the hbase.dynamic.jars.dir config.
    
    See Also:
    
    Constant Field Values
  - HREGION_COMPACTIONDIR_NAME
```
public static final String HREGION_COMPACTIONDIR_NAME
```
    Used to construct the name of the compaction directory during compaction
    
    See Also:
    
    Constant Field Values
  - HREGION_MAX_FILESIZE
```
public static final String HREGION_MAX_FILESIZE
```
    Conf key for the max file size after which we split the region
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MAX_FILE_SIZE
```
public static final long DEFAULT_MAX_FILE_SIZE
```
    Default maximum file size
    
    See Also:
    
    Constant Field Values
  - TABLE_MAX_ROWSIZE_KEY
```
public static final String TABLE_MAX_ROWSIZE_KEY
```
    Max size of single row for Get's or Scan's without in-row scanning flag set.
    
    See Also:
    
    Constant Field Values
  - TABLE_MAX_ROWSIZE_DEFAULT
```
public static final long TABLE_MAX_ROWSIZE_DEFAULT
```
    Default max row size (1 Gb).
    
    See Also:
    
    Constant Field Values
  - HSTORE_OPEN_AND_CLOSE_THREADS_MAX
```
public static final String HSTORE_OPEN_AND_CLOSE_THREADS_MAX
```
    The max number of threads used for opening and closing stores or store files in parallel
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HSTORE_OPEN_AND_CLOSE_THREADS_MAX
```
public static final int DEFAULT_HSTORE_OPEN_AND_CLOSE_THREADS_MAX
```
    The default number for the max number of threads used for opening and closing stores or store files in parallel
    
    See Also:
    
    Constant Field Values
  - HREGION_MEMSTORE_BLOCK_MULTIPLIER
```
public static final String HREGION_MEMSTORE_BLOCK_MULTIPLIER
```
    Block updates if memstore has hbase.hregion.memstore.block.multiplier times hbase.hregion.memstore.flush.size bytes. Useful preventing runaway memstore during spikes in update traffic.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HREGION_MEMSTORE_BLOCK_MULTIPLIER
```
public static final int DEFAULT_HREGION_MEMSTORE_BLOCK_MULTIPLIER
```
    Default value for hbase.hregion.memstore.block.multiplier
    
    See Also:
    
    Constant Field Values
  - HREGION_MEMSTORE_FLUSH_SIZE
```
public static final String HREGION_MEMSTORE_FLUSH_SIZE
```
    Conf key for the memstore size at which we flush the memstore
    
    See Also:
    
    Constant Field Values
  - HREGION_EDITS_REPLAY_SKIP_ERRORS
```
public static final String HREGION_EDITS_REPLAY_SKIP_ERRORS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_HREGION_EDITS_REPLAY_SKIP_ERRORS
```
public static final boolean DEFAULT_HREGION_EDITS_REPLAY_SKIP_ERRORS
```
    See Also:
    
    Constant Field Values
  - MAXIMUM_VALUE_LENGTH
```
public static final int MAXIMUM_VALUE_LENGTH
```
    Maximum value length, enforced on KeyValue construction
    
    See Also:
    
    Constant Field Values
  - CLUSTER_ID_FILE_NAME
```
public static final String CLUSTER_ID_FILE_NAME
```
    name of the file for unique cluster ID
    
    See Also:
    
    Constant Field Values
  - CLUSTER_ID_DEFAULT
```
public static final String CLUSTER_ID_DEFAULT
```
    Default value for cluster ID
    
    See Also:
    
    Constant Field Values
  - KEEP_SEQID_PERIOD
```
public static final String KEEP_SEQID_PERIOD
```
    Parameter name for # days to keep MVCC values during a major compaction
    
    See Also:
    
    Constant Field Values
  - MIN_KEEP_SEQID_PERIOD
```
public static final int MIN_KEEP_SEQID_PERIOD
```
    At least to keep MVCC values in hfiles for 5 days
    
    See Also:
    
    Constant Field Values
  - BASE_NAMESPACE_DIR
```
public static final String BASE_NAMESPACE_DIR
```
    See Also:
    
    Constant Field Values
  - META_ROW_DELIMITER
```
public static final int META_ROW_DELIMITER
```
    delimiter used between portions of a region name
    
    See Also:
    
    Constant Field Values
  - CATALOG_FAMILY_STR
```
public static final String CATALOG_FAMILY_STR
```
    The catalog family as a string
    
    See Also:
    
    Constant Field Values
  - CATALOG_FAMILY
```
public static final byte[] CATALOG_FAMILY
```
    The catalog family
  - REGIONINFO_QUALIFIER_STR
```
public static final String REGIONINFO_QUALIFIER_STR
```
    The RegionInfo qualifier as a string
    
    See Also:
    
    Constant Field Values
  - REGIONINFO_QUALIFIER
```
public static final byte[] REGIONINFO_QUALIFIER
```
    The regioninfo column qualifier
  - SERVER_QUALIFIER_STR
```
public static final String SERVER_QUALIFIER_STR
```
    The server column qualifier
    
    See Also:
    
    Constant Field Values
  - SERVER_QUALIFIER
```
public static final byte[] SERVER_QUALIFIER
```
    The server column qualifier
  - STARTCODE_QUALIFIER_STR
```
public static final String STARTCODE_QUALIFIER_STR
```
    The startcode column qualifier
    
    See Also:
    
    Constant Field Values
  - STARTCODE_QUALIFIER
```
public static final byte[] STARTCODE_QUALIFIER
```
    The startcode column qualifier
  - SEQNUM_QUALIFIER_STR
```
public static final String SEQNUM_QUALIFIER_STR
```
    The open seqnum column qualifier
    
    See Also:
    
    Constant Field Values
  - SEQNUM_QUALIFIER
```
public static final byte[] SEQNUM_QUALIFIER
```
    The open seqnum column qualifier
  - STATE_QUALIFIER_STR
```
public static final String STATE_QUALIFIER_STR
```
    The state column qualifier
    
    See Also:
    
    Constant Field Values
  - STATE_QUALIFIER
```
public static final byte[] STATE_QUALIFIER
```
  - SERVERNAME_QUALIFIER_STR
```
public static final String SERVERNAME_QUALIFIER_STR
```
    The serverName column qualifier. Its the server where the region is transitioning on, while column server is the server where the region is opened on. They are the same when the region is in state OPEN.
    
    See Also:
    
    Constant Field Values
  - SERVERNAME_QUALIFIER
```
public static final byte[] SERVERNAME_QUALIFIER
```
  - SPLITA_QUALIFIER
```
public static final byte[] SPLITA_QUALIFIER
```
    The lower-half split region column qualifier
  - SPLITB_QUALIFIER
```
public static final byte[] SPLITB_QUALIFIER
```
    The upper-half split region column qualifier
  - MERGE_QUALIFIER_PREFIX_STR
```
public static final String MERGE_QUALIFIER_PREFIX_STR
```
    Merge qualifier prefix. We used to only allow two regions merge; mergeA and mergeB. Now we allow many to merge. Each region to merge will be referenced in a column whose qualifier starts with this define.
    
    See Also:
    
    Constant Field Values
  - MERGE_QUALIFIER_PREFIX
```
public static final byte[] MERGE_QUALIFIER_PREFIX
```
  - MERGEA_QUALIFIER
```
@Deprecated
public static final byte[] MERGEA_QUALIFIER
```
    Deprecated. Since 2.3.0 and 2.2.1. Not used anymore. Instead we look for the MERGE_QUALIFIER_PREFIX_STR prefix.
    
    The lower-half merge region column qualifier
  - MERGEB_QUALIFIER
```
@Deprecated
public static final byte[] MERGEB_QUALIFIER
```
    Deprecated. Since 2.3.0 and 2.2.1. Not used anymore. Instead we look for the MERGE_QUALIFIER_PREFIX_STR prefix.
    
    The upper-half merge region column qualifier
  - TABLE_FAMILY_STR
```
public static final String TABLE_FAMILY_STR
```
    The catalog family as a string
    
    See Also:
    
    Constant Field Values
  - TABLE_FAMILY
```
public static final byte[] TABLE_FAMILY
```
    The catalog family
  - TABLE_STATE_QUALIFIER
```
public static final byte[] TABLE_STATE_QUALIFIER
```
    The serialized table state qualifier
  - META_VERSION_QUALIFIER
```
public static final byte[] META_VERSION_QUALIFIER
```
    The meta table version column qualifier. We keep current version of the meta table in this column in -ROOT- table: i.e. in the 'info:v' column.
  - META_VERSION
```
public static final short META_VERSION
```
    The current version of the meta table. - pre-hbase 0.92. There is no META_VERSION column in the root table in this case. The meta has HTableDescriptor serialized into the HRegionInfo; - version 0 is 0.92 and 0.94. Meta data has serialized HRegionInfo's using Writable serialization, and HRegionInfo's does not contain HTableDescriptors. - version 1 for 0.96+ keeps HRegionInfo data structures, but changes the byte[] serialization from Writables to Protobuf. See HRegionInfo.VERSION
    
    See Also:
    
    Constant Field Values
  - EMPTY_BYTE_ARRAY
```
public static final byte[] EMPTY_BYTE_ARRAY
```
    An empty instance.
  - EMPTY_BYTE_BUFFER
```
public static final ByteBuffer EMPTY_BYTE_BUFFER
```
  - EMPTY_START_ROW
```
public static final byte[] EMPTY_START_ROW
```
    Used by scanners, etc when they want to start at the beginning of a region
  - EMPTY_END_ROW
```
public static final byte[] EMPTY_END_ROW
```
    Last row in a table.
  - LAST_ROW
```
public static final byte[] LAST_ROW
```
    Used by scanners and others when they're trying to detect the end of a table
  - MAX_ROW_LENGTH
```
public static final int MAX_ROW_LENGTH
```
    Max length a row can have because of the limitation in TFile.
    
    See Also:
    
    Constant Field Values
  - LATEST_TIMESTAMP
```
public static final long LATEST_TIMESTAMP
```
    Timestamp to use when we want to refer to the latest cell. This is the timestamp sent by clients when no timestamp is specified on commit.
    
    See Also:
    
    Constant Field Values
  - OLDEST_TIMESTAMP
```
@Deprecated
public static final long OLDEST_TIMESTAMP
```
    Deprecated. Should not be public since hbase-1.3.0. For internal use only. Move internal to Scanners flagged as special timestamp value never to be returned as timestamp on a Cell.
    
    Timestamp to use when we want to refer to the oldest cell. Special! Used in fake Cells only. Should never be the timestamp on an actual Cell returned to a client.
    
    See Also:
    
    Constant Field Values
  - LATEST_TIMESTAMP_BYTES
```
public static final byte[] LATEST_TIMESTAMP_BYTES
```
    LATEST_TIMESTAMP in bytes form
  - ALL_VERSIONS
```
public static final int ALL_VERSIONS
```
    Define for 'return-all-versions'.
    
    See Also:
    
    Constant Field Values
  - FOREVER
```
public static final int FOREVER
```
    Unlimited time-to-live.
    
    See Also:
    
    Constant Field Values
  - WEEK_IN_SECONDS
```
@Deprecated
public static final int WEEK_IN_SECONDS
```
    Deprecated.
    
    Seconds in a week
    
    See Also:
    
    Constant Field Values
  - DAY_IN_SECONDS
```
public static final int DAY_IN_SECONDS
```
    Seconds in a day, hour and minute
    
    See Also:
    
    Constant Field Values
  - HOUR_IN_SECONDS
```
public static final int HOUR_IN_SECONDS
```
    See Also:
    
    Constant Field Values
  - MINUTE_IN_SECONDS
```
public static final int MINUTE_IN_SECONDS
```
    See Also:
    
    Constant Field Values
  - NAME
```
public static final String NAME
```
    See Also:
    
    Constant Field Values
  - VERSIONS
```
public static final String VERSIONS
```
    See Also:
    
    Constant Field Values
  - IN_MEMORY
```
public static final String IN_MEMORY
```
    See Also:
    
    Constant Field Values
  - METADATA
```
public static final String METADATA
```
    See Also:
    
    Constant Field Values
  - CONFIGURATION
```
public static final String CONFIGURATION
```
    See Also:
    
    Constant Field Values
  - RETRY_BACKOFF
```
public static final int[] RETRY_BACKOFF
```
    Retrying we multiply hbase.client.pause setting by what we have in this array until we run out of array items. Retries beyond this use the last number in the array. So, for example, if hbase.client.pause is 1 second, and maximum retries count hbase.client.retries.number is 10, we will retry at the following intervals: 1, 2, 3, 5, 10, 20, 40, 100, 100, 100. With 100ms, a back-off of 200 means 20s
  - REGION_IMPL
```
public static final String REGION_IMPL
```
    See Also:
    
    Constant Field Values
  - REPLICATION_SCOPE_LOCAL
```
public static final int REPLICATION_SCOPE_LOCAL
```
    Scope tag for locally scoped data. This data will not be replicated.
    
    See Also:
    
    Constant Field Values
  - REPLICATION_SCOPE_GLOBAL
```
public static final int REPLICATION_SCOPE_GLOBAL
```
    Scope tag for globally scoped data. This data will be replicated to all peers.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_CLUSTER_ID
```
public static final UUID DEFAULT_CLUSTER_ID
```
    Default cluster ID, cannot be used to identify a cluster so a key with this value means it wasn't meant for replication.
  - HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE_KEY
```
public static final String HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE_KEY
```
    Parameter name for maximum number of bytes returned when calling a scanner's next method. Controlled by the client.
    
    See Also:
    
    Constant Field Values
  - HBASE_SERVER_SCANNER_MAX_RESULT_SIZE_KEY
```
public static final String HBASE_SERVER_SCANNER_MAX_RESULT_SIZE_KEY
```
    Parameter name for maximum number of bytes returned when calling a scanner's next method. Controlled by the server.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE
```
public static final long DEFAULT_HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE
```
    Maximum number of bytes returned when calling a scanner's next method. Note that when a single row is larger than this limit the row is still returned completely. The default value is 2MB.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_SERVER_SCANNER_MAX_RESULT_SIZE
```
public static final long DEFAULT_HBASE_SERVER_SCANNER_MAX_RESULT_SIZE
```
    Maximum number of bytes returned when calling a scanner's next method. Note that when a single row is larger than this limit the row is still returned completely. Safety setting to protect the region server. The default value is 100MB. (a client would rarely request larger chunks on purpose)
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_PAUSE
```
public static final String HBASE_CLIENT_PAUSE
```
    Parameter name for client pause value, used mostly as value to wait before running a retry of a failed get, region lookup, etc.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_PAUSE
```
public static final long DEFAULT_HBASE_CLIENT_PAUSE
```
    Default value of HBASE_CLIENT_PAUSE.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_PAUSE_FOR_CQTBE
```
public static final String HBASE_CLIENT_PAUSE_FOR_CQTBE
```
    Parameter name for client pause value for special case such as call queue too big, etc.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_MAX_TOTAL_TASKS
```
public static final String HBASE_CLIENT_MAX_TOTAL_TASKS
```
    The maximum number of concurrent connections the client will maintain.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_MAX_TOTAL_TASKS
```
public static final int DEFAULT_HBASE_CLIENT_MAX_TOTAL_TASKS
```
    Default value of HBASE_CLIENT_MAX_TOTAL_TASKS.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_MAX_PERSERVER_TASKS
```
public static final String HBASE_CLIENT_MAX_PERSERVER_TASKS
```
    The maximum number of concurrent connections the client will maintain to a single RegionServer.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_MAX_PERSERVER_TASKS
```
public static final int DEFAULT_HBASE_CLIENT_MAX_PERSERVER_TASKS
```
    Default value of HBASE_CLIENT_MAX_PERSERVER_TASKS.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_MAX_PERREGION_TASKS
```
public static final String HBASE_CLIENT_MAX_PERREGION_TASKS
```
    The maximum number of concurrent connections the client will maintain to a single Region.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_MAX_PERREGION_TASKS
```
public static final int DEFAULT_HBASE_CLIENT_MAX_PERREGION_TASKS
```
    Default value of HBASE_CLIENT_MAX_PERREGION_TASKS.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD
```
public static final String HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD
```
    The maximum number of concurrent pending RPC requests for one server in process level.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD
```
public static final int DEFAULT_HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD
```
    Default value of HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD.
    
    See Also:
    
    Constant Field Values
  - HBASE_SERVER_PAUSE
```
public static final String HBASE_SERVER_PAUSE
```
    Parameter name for server pause value, used mostly as value to wait before running a retry of a failed operation.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_SERVER_PAUSE
```
public static final int DEFAULT_HBASE_SERVER_PAUSE
```
    Default value of HBASE_SERVER_PAUSE.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_RETRIES_NUMBER
```
public static final String HBASE_CLIENT_RETRIES_NUMBER
```
    Parameter name for maximum retries, used as maximum for all retryable operations such as fetching of the root region from root region server, getting a cell's value, starting a row update, etc.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_RETRIES_NUMBER
```
public static final int DEFAULT_HBASE_CLIENT_RETRIES_NUMBER
```
    Default value of HBASE_CLIENT_RETRIES_NUMBER.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_SERVERSIDE_RETRIES_MULTIPLIER
```
public static final String HBASE_CLIENT_SERVERSIDE_RETRIES_MULTIPLIER
```
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_SERVERSIDE_RETRIES_MULTIPLIER
```
public static final int DEFAULT_HBASE_CLIENT_SERVERSIDE_RETRIES_MULTIPLIER
```
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_SCANNER_CACHING
```
public static final String HBASE_CLIENT_SCANNER_CACHING
```
    Parameter name to set the default scanner caching for all clients.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_SCANNER_CACHING
```
public static final int DEFAULT_HBASE_CLIENT_SCANNER_CACHING
```
    Default value for HBASE_CLIENT_SCANNER_CACHING
    
    See Also:
    
    Constant Field Values
  - HBASE_META_SCANNER_CACHING
```
public static final String HBASE_META_SCANNER_CACHING
```
    Parameter name for number of rows that will be fetched when calling next on a scanner if it is not served from memory. Higher caching values will enable faster scanners but will eat up more memory and some calls of next may take longer and longer times when the cache is empty.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_META_SCANNER_CACHING
```
public static final int DEFAULT_HBASE_META_SCANNER_CACHING
```
    Default value of HBASE_META_SCANNER_CACHING.
    
    See Also:
    
    Constant Field Values
  - HBASE_META_VERSIONS
```
public static final String HBASE_META_VERSIONS
```
    Parameter name for number of versions, kept by meta table.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_META_VERSIONS
```
public static final int DEFAULT_HBASE_META_VERSIONS
```
    Default value of HBASE_META_VERSIONS.
    
    See Also:
    
    Constant Field Values
  - HBASE_META_BLOCK_SIZE
```
public static final String HBASE_META_BLOCK_SIZE
```
    Parameter name for number of versions, kept by meta table.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_META_BLOCK_SIZE
```
public static final int DEFAULT_HBASE_META_BLOCK_SIZE
```
    Default value of HBASE_META_BLOCK_SIZE.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_INSTANCE_ID
```
public static final String HBASE_CLIENT_INSTANCE_ID
```
    Parameter name for unique identifier for this Configuration instance. If there are two or more Configuration instances that, for all intents and purposes, are the same except for their instance ids, then they will not be able to share the same org.apache.hadoop.hbase.client.HConnection instance. On the other hand, even if the instance ids are the same, it could result in non-shared org.apache.hadoop.hbase.client.HConnection instances if some of the other connection parameters differ.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD
```
public static final String HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD
```
    The client scanner timeout period in milliseconds.
    
    See Also:
    
    Constant Field Values
  - HBASE_REGIONSERVER_LEASE_PERIOD_KEY
```
@Deprecated
public static final String HBASE_REGIONSERVER_LEASE_PERIOD_KEY
```
    Deprecated. This config option is deprecated. Will be removed at later releases after 0.96.
    
    Use HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD instead.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD
```
public static final int DEFAULT_HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD
```
    Default value of HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD.
    
    See Also:
    
    Constant Field Values
  - HBASE_RPC_TIMEOUT_KEY
```
public static final String HBASE_RPC_TIMEOUT_KEY
```
    timeout for each RPC
    
    See Also:
    
    Constant Field Values
  - HBASE_RPC_READ_TIMEOUT_KEY
```
public static final String HBASE_RPC_READ_TIMEOUT_KEY
```
    timeout for each read RPC
    
    See Also:
    
    Constant Field Values
  - HBASE_RPC_WRITE_TIMEOUT_KEY
```
public static final String HBASE_RPC_WRITE_TIMEOUT_KEY
```
    timeout for each write RPC
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_RPC_TIMEOUT
```
public static final int DEFAULT_HBASE_RPC_TIMEOUT
```
    Default value of HBASE_RPC_TIMEOUT_KEY
    
    See Also:
    
    Constant Field Values
  - HBASE_RPC_SHORTOPERATION_TIMEOUT_KEY
```
public static final String HBASE_RPC_SHORTOPERATION_TIMEOUT_KEY
```
    timeout for short operation RPC
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HBASE_RPC_SHORTOPERATION_TIMEOUT
```
public static final int DEFAULT_HBASE_RPC_SHORTOPERATION_TIMEOUT
```
    Default value of HBASE_RPC_SHORTOPERATION_TIMEOUT_KEY
    
    See Also:
    
    Constant Field Values
  - NO_SEQNUM
```
public static final long NO_SEQNUM
```
    Value indicating the server name was saved with no sequence number.
    
    See Also:
    
    Constant Field Values
  - REPLICATION_SOURCE_SERVICE_CLASSNAME
```
public static final String REPLICATION_SOURCE_SERVICE_CLASSNAME
```
    See Also:
    
    Constant Field Values
  - REPLICATION_SINK_SERVICE_CLASSNAME
```
public static final String REPLICATION_SINK_SERVICE_CLASSNAME
```
    See Also:
    
    Constant Field Values
  - REPLICATION_SERVICE_CLASSNAME_DEFAULT
```
public static final String REPLICATION_SERVICE_CLASSNAME_DEFAULT
```
    See Also:
    
    Constant Field Values
  - REPLICATION_BULKLOAD_ENABLE_KEY
```
public static final String REPLICATION_BULKLOAD_ENABLE_KEY
```
    See Also:
    
    Constant Field Values
  - REPLICATION_BULKLOAD_ENABLE_DEFAULT
```
public static final boolean REPLICATION_BULKLOAD_ENABLE_DEFAULT
```
    See Also:
    
    Constant Field Values
  - REPLICATION_CLUSTER_ID
```
public static final String REPLICATION_CLUSTER_ID
```
    Replication cluster id of source cluster which uniquely identifies itself with peer cluster
    
    See Also:
    
    Constant Field Values
  - REPLICATION_SOURCE_TOTAL_BUFFER_KEY
```
public static final String REPLICATION_SOURCE_TOTAL_BUFFER_KEY
```
    Max total size of buffered entries in all replication peers. It will prevent server getting OOM if there are many peers. Default value is 256MB which is four times to default replication.source.size.capacity.
    
    See Also:
    
    Constant Field Values
  - REPLICATION_SOURCE_TOTAL_BUFFER_DFAULT
```
public static final int REPLICATION_SOURCE_TOTAL_BUFFER_DFAULT
```
    See Also:
    
    Constant Field Values
  - REPLICATION_CONF_DIR
```
public static final String REPLICATION_CONF_DIR
```
    Directory where the source cluster file system client configuration are placed which is used by sink cluster to copy HFiles from source cluster file system
    
    See Also:
    
    Constant Field Values
  - BULKLOAD_MAX_RETRIES_NUMBER
```
public static final String BULKLOAD_MAX_RETRIES_NUMBER
```
    Maximum time to retry for a failed bulk load request
    
    See Also:
    
    Constant Field Values
  - HBCK_CODE_NAME
```
@Deprecated
public static final String HBCK_CODE_NAME
```
    Deprecated.
    
    HBCK special code name used as server name when manipulating ZK nodes
    
    See Also:
    
    Constant Field Values
  - KEY_FOR_HOSTNAME_SEEN_BY_MASTER
```
public static final String KEY_FOR_HOSTNAME_SEEN_BY_MASTER
```
    See Also:
    
    Constant Field Values
  - HBASE_MASTER_LOGCLEANER_PLUGINS
```
public static final String HBASE_MASTER_LOGCLEANER_PLUGINS
```
    See Also:
    
    Constant Field Values
  - HBASE_REGION_SPLIT_POLICY_KEY
```
public static final String HBASE_REGION_SPLIT_POLICY_KEY
```
    See Also:
    
    Constant Field Values
  - HBASE_RS_NONCES_ENABLED
```
public static final String HBASE_RS_NONCES_ENABLED
```
    Whether nonces are enabled; default is true.
    
    See Also:
    
    Constant Field Values
  - HFILE_BLOCK_CACHE_SIZE_KEY
```
public static final String HFILE_BLOCK_CACHE_SIZE_KEY
```
    Configuration key for the size of the block cache
    
    See Also:
    
    Constant Field Values
  - HFILE_BLOCK_CACHE_SIZE_DEFAULT
```
public static final float HFILE_BLOCK_CACHE_SIZE_DEFAULT
```
    See Also:
    
    Constant Field Values
  - HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD
```
public static final float HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD
```
    See Also:
    
    Constant Field Values
  - CP_HTD_ATTR_KEY_PATTERN
```
@Deprecated
public static final Pattern CP_HTD_ATTR_KEY_PATTERN
```
    Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
  - CP_HTD_ATTR_VALUE_PATTERN
```
@Deprecated
public static final Pattern CP_HTD_ATTR_VALUE_PATTERN
```
    Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
```
 Pattern that matches a coprocessor specification. Form is:
  <coprocessor jar file location> '|' <class name> ['|' <priority> ['|' <arguments>]]
 where arguments are  <KEY> '=' <VALUE> [,...]
 For example:  hdfs:///foo.jar|com.foo.FooRegionObserver|1001|arg1=1,arg2=2
 
```
  - CP_HTD_ATTR_VALUE_PARAM_KEY_PATTERN
```
@Deprecated
public static final String CP_HTD_ATTR_VALUE_PARAM_KEY_PATTERN
```
    Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
    
    See Also:
    
    Constant Field Values
  - CP_HTD_ATTR_VALUE_PARAM_VALUE_PATTERN
```
@Deprecated
public static final String CP_HTD_ATTR_VALUE_PARAM_VALUE_PATTERN
```
    Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
    
    See Also:
    
    Constant Field Values
  - CP_HTD_ATTR_VALUE_PARAM_PATTERN
```
@Deprecated
public static final Pattern CP_HTD_ATTR_VALUE_PARAM_PATTERN
```
    Deprecated. It is used internally. As of release 2.0.0, this will be removed in HBase 3.0.0.
  - CP_HTD_ATTR_INCLUSION_KEY
```
public static final String CP_HTD_ATTR_INCLUSION_KEY
```
    See Also:
    
    Constant Field Values
  - SOCKET_RETRY_WAIT_MS
```
public static final int SOCKET_RETRY_WAIT_MS
```
    The delay when re-trying a socket operation in a loop (HBASE-4712)
    
    See Also:
    
    Constant Field Values
  - LOCALHOST
```
public static final String LOCALHOST
```
    Host name of the local machine
    
    See Also:
    
    Constant Field Values
  - HBASE_CHECKSUM_VERIFICATION
```
public static final String HBASE_CHECKSUM_VERIFICATION
```
    If this parameter is set to true, then hbase will read data and then verify checksums. Checksum verification inside hdfs will be switched off. However, if the hbase-checksum verification fails, then it will switch back to using hdfs checksums for verifiying data that is being read from storage. If this parameter is set to false, then hbase will not verify any checksums, instead it will depend on checksum verification being done in the hdfs client.
    
    See Also:
    
    Constant Field Values
  - LOCALHOST_IP
```
public static final String LOCALHOST_IP
```
    See Also:
    
    Constant Field Values
  - REGION_SERVER_HANDLER_COUNT
```
public static final String REGION_SERVER_HANDLER_COUNT
```
    See Also:
    
    Constant Field Values
  - DEFAULT_REGION_SERVER_HANDLER_COUNT
```
public static final int DEFAULT_REGION_SERVER_HANDLER_COUNT
```
    See Also:
    
    Constant Field Values
  - REGION_SERVER_HANDLER_ABORT_ON_ERROR_PERCENT
```
public static final String REGION_SERVER_HANDLER_ABORT_ON_ERROR_PERCENT
```
    See Also:
    
    Constant Field Values
  - DEFAULT_REGION_SERVER_HANDLER_ABORT_ON_ERROR_PERCENT
```
public static final double DEFAULT_REGION_SERVER_HANDLER_ABORT_ON_ERROR_PERCENT
```
    See Also:
    
    Constant Field Values
  - REGION_SERVER_HIGH_PRIORITY_HANDLER_COUNT
```
public static final String REGION_SERVER_HIGH_PRIORITY_HANDLER_COUNT
```
    See Also:
    
    Constant Field Values
  - DEFAULT_REGION_SERVER_HIGH_PRIORITY_HANDLER_COUNT
```
public static final int DEFAULT_REGION_SERVER_HIGH_PRIORITY_HANDLER_COUNT
```
    See Also:
    
    Constant Field Values
  - REGION_SERVER_REPLICATION_HANDLER_COUNT
```
public static final String REGION_SERVER_REPLICATION_HANDLER_COUNT
```
    See Also:
    
    Constant Field Values
  - DEFAULT_REGION_SERVER_REPLICATION_HANDLER_COUNT
```
public static final int DEFAULT_REGION_SERVER_REPLICATION_HANDLER_COUNT
```
    See Also:
    
    Constant Field Values
  - MASTER_META_TRANSITION_HANDLER_COUNT
```
public static final String MASTER_META_TRANSITION_HANDLER_COUNT
```
    See Also:
    
    Constant Field Values
  - MASTER__META_TRANSITION_HANDLER_COUNT_DEFAULT
```
public static final int MASTER__META_TRANSITION_HANDLER_COUNT_DEFAULT
```
    See Also:
    
    Constant Field Values
  - MASTER_HANDLER_COUNT
```
@Deprecated
public static final String MASTER_HANDLER_COUNT
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MASTER_HANLDER_COUNT
```
@Deprecated
public static final int DEFAULT_MASTER_HANLDER_COUNT
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - LOG_REPLAY_WAIT_REGION_TIMEOUT
```
@Deprecated
public static final String LOG_REPLAY_WAIT_REGION_TIMEOUT
```
    Deprecated.
    
    Conf key that specifies timeout value to wait for a region ready
    
    See Also:
    
    Constant Field Values
  - USE_META_REPLICAS
```
public static final String USE_META_REPLICAS
```
    Conf key for enabling meta replication
    
    See Also:
    
    Constant Field Values
  - DEFAULT_USE_META_REPLICAS
```
public static final boolean DEFAULT_USE_META_REPLICAS
```
    See Also:
    
    Constant Field Values
  - META_REPLICAS_NUM
```
public static final String META_REPLICAS_NUM
```
    See Also:
    
    Constant Field Values
  - DEFAULT_META_REPLICA_NUM
```
public static final int DEFAULT_META_REPLICA_NUM
```
    See Also:
    
    Constant Field Values
  - BYTES_PER_CHECKSUM
```
public static final String BYTES_PER_CHECKSUM
```
    The name of the configuration parameter that specifies the number of bytes in a newly created checksum chunk.
    
    See Also:
    
    Constant Field Values
  - CHECKSUM_TYPE_NAME
```
public static final String CHECKSUM_TYPE_NAME
```
    The name of the configuration parameter that specifies the name of an algorithm that is used to compute checksums for newly created blocks.
    
    See Also:
    
    Constant Field Values
  - ENABLE_DATA_FILE_UMASK
```
public static final String ENABLE_DATA_FILE_UMASK
```
    Enable file permission modification from standard hbase
    
    See Also:
    
    Constant Field Values
  - DATA_FILE_UMASK_KEY
```
public static final String DATA_FILE_UMASK_KEY
```
    File permission umask to use when creating hbase data files
    
    See Also:
    
    Constant Field Values
  - ENABLE_WAL_COMPRESSION
```
public static final String ENABLE_WAL_COMPRESSION
```
    Configuration name of WAL Compression
    
    See Also:
    
    Constant Field Values
  - WAL_STORAGE_POLICY
```
public static final String WAL_STORAGE_POLICY
```
    Configuration name of WAL storage policy Valid values are: HOT, COLD, WARM, ALL_SSD, ONE_SSD, LAZY_PERSIST See http://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html
    
    See Also:
    
    Constant Field Values
  - DEFER_TO_HDFS_STORAGE_POLICY
```
public static final String DEFER_TO_HDFS_STORAGE_POLICY
```
    "NONE" is not a valid storage policy and means we defer the policy to HDFS. @see HBASE-20691
    
    See Also:
    
    Constant Field Values
  - DEFAULT_WAL_STORAGE_POLICY
```
public static final String DEFAULT_WAL_STORAGE_POLICY
```
    By default we defer the WAL storage policy to HDFS
    
    See Also:
    
    Constant Field Values
  - METRICS_RIT_STUCK_WARNING_THRESHOLD
```
public static final String METRICS_RIT_STUCK_WARNING_THRESHOLD
```
    Region in Transition metrics threshold time
    
    See Also:
    
    Constant Field Values
  - LOAD_BALANCER_SLOP_KEY
```
public static final String LOAD_BALANCER_SLOP_KEY
```
    See Also:
    
    Constant Field Values
  - DELIMITER
```
public static final int DELIMITER
```
    delimiter used between portions of a region name
    
    See Also:
    
    Constant Field Values
  - PRIORITY_UNSET
```
public static final int PRIORITY_UNSET
```
    QOS attributes: these attributes are used to demarcate RPC call processing by different set of handlers. For example, HIGH_QOS tagged methods are handled by high priority handlers.
    
    See Also:
    
    Constant Field Values
  - NORMAL_QOS
```
public static final int NORMAL_QOS
```
    See Also:
    
    Constant Field Values
  - REPLICATION_QOS
```
public static final int REPLICATION_QOS
```
    See Also:
    
    Constant Field Values
  - REPLAY_QOS
```
public static final int REPLAY_QOS
```
    See Also:
    
    Constant Field Values
  - QOS_THRESHOLD
```
public static final int QOS_THRESHOLD
```
    See Also:
    
    Constant Field Values
  - ADMIN_QOS
```
public static final int ADMIN_QOS
```
    See Also:
    
    Constant Field Values
  - HIGH_QOS
```
public static final int HIGH_QOS
```
    See Also:
    
    Constant Field Values
  - SYSTEMTABLE_QOS
```
public static final int SYSTEMTABLE_QOS
```
    See Also:
    
    Constant Field Values
  - META_QOS
```
public static final int META_QOS
```
    See Also:
    
    Constant Field Values
  - HFILE_ARCHIVE_DIRECTORY
```
public static final String HFILE_ARCHIVE_DIRECTORY
```
    Directory under /hbase where archived hfiles are stored
    
    See Also:
    
    Constant Field Values
  - SNAPSHOT_DIR_NAME
```
public static final String SNAPSHOT_DIR_NAME
```
    Name of the directory to store all snapshots. See SnapshotDescriptionUtils for remaining snapshot constants; this is here to keep HConstants dependencies at a minimum and uni-directional.
    
    See Also:
    
    Constant Field Values
  - OLD_SNAPSHOT_DIR_NAME
```
public static final String OLD_SNAPSHOT_DIR_NAME
```
    See Also:
    
    Constant Field Values
  - HBASE_TEMP_DIRECTORY
```
public static final String HBASE_TEMP_DIRECTORY
```
    Temporary directory used for table creation and deletion
    
    See Also:
    
    Constant Field Values
  - REGIONSERVER_METRICS_PERIOD
```
public static final String REGIONSERVER_METRICS_PERIOD
```
    The period (in milliseconds) between computing region server point in time metrics
    
    See Also:
    
    Constant Field Values
  - DEFAULT_REGIONSERVER_METRICS_PERIOD
```
public static final long DEFAULT_REGIONSERVER_METRICS_PERIOD
```
    See Also:
    
    Constant Field Values
  - HBASE_NON_TABLE_DIRS
```
public static final List<String> HBASE_NON_TABLE_DIRS
```
    Directories that are not HBase table directories
  - HBASE_NON_USER_TABLE_DIRS
```
public static final List<String> HBASE_NON_USER_TABLE_DIRS
```
    Directories that are not HBase user table directories
  - HEALTH_SCRIPT_LOC
```
public static final String HEALTH_SCRIPT_LOC
```
    Health script related settings.
    
    See Also:
    
    Constant Field Values
  - HEALTH_SCRIPT_TIMEOUT
```
public static final String HEALTH_SCRIPT_TIMEOUT
```
    See Also:
    
    Constant Field Values
  - HEALTH_CHORE_WAKE_FREQ
```
public static final String HEALTH_CHORE_WAKE_FREQ
```
    See Also:
    
    Constant Field Values
  - DEFAULT_HEALTH_SCRIPT_TIMEOUT
```
public static final long DEFAULT_HEALTH_SCRIPT_TIMEOUT
```
    See Also:
    
    Constant Field Values
  - HEALTH_FAILURE_THRESHOLD
```
public static final String HEALTH_FAILURE_THRESHOLD
```
    The maximum number of health check failures a server can encounter consecutively.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_HEALTH_FAILURE_THRESHOLD
```
public static final int DEFAULT_HEALTH_FAILURE_THRESHOLD
```
    See Also:
    
    Constant Field Values
  - STATUS_PUBLISHED
```
public static final String STATUS_PUBLISHED
```
    Setting to activate, or not, the publication of the status by the master. Default notification is by a multicast message.
    
    See Also:
    
    Constant Field Values
  - STATUS_PUBLISHED_DEFAULT
```
public static final boolean STATUS_PUBLISHED_DEFAULT
```
    See Also:
    
    Constant Field Values
  - STATUS_MULTICAST_ADDRESS
```
public static final String STATUS_MULTICAST_ADDRESS
```
    IP to use for the multicast status messages between the master and the clients. The default address is chosen as one among others within the ones suitable for multicast messages.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_STATUS_MULTICAST_ADDRESS
```
public static final String DEFAULT_STATUS_MULTICAST_ADDRESS
```
    See Also:
    
    Constant Field Values
  - STATUS_MULTICAST_BIND_ADDRESS
```
public static final String STATUS_MULTICAST_BIND_ADDRESS
```
    The address to use for binding the local socket for receiving multicast. Defaults to 0.0.0.0.
    
    See Also:
    
    HBASE-9961, Constant Field Values
  - DEFAULT_STATUS_MULTICAST_BIND_ADDRESS
```
public static final String DEFAULT_STATUS_MULTICAST_BIND_ADDRESS
```
    See Also:
    
    Constant Field Values
  - STATUS_MULTICAST_PORT
```
public static final String STATUS_MULTICAST_PORT
```
    The port to use for the multicast messages.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_STATUS_MULTICAST_PORT
```
public static final int DEFAULT_STATUS_MULTICAST_PORT
```
    See Also:
    
    Constant Field Values
  - STATUS_MULTICAST_NI_NAME
```
public static final String STATUS_MULTICAST_NI_NAME
```
    The network interface name to use for the multicast messages.
    
    See Also:
    
    Constant Field Values
  - STATUS_MULTICAST_PUBLISHER_BIND_ADDRESS
```
public static final String STATUS_MULTICAST_PUBLISHER_BIND_ADDRESS
```
    The address to use for binding the local socket for sending multicast. Defaults to 0.0.0.0.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_STATUS_MULTICAST_PUBLISHER_BIND_ADDRESS
```
public static final String DEFAULT_STATUS_MULTICAST_PUBLISHER_BIND_ADDRESS
```
    See Also:
    
    Constant Field Values
  - NO_NONCE
```
public static final long NO_NONCE
```
    See Also:
    
    Constant Field Values
  - CIPHER_AES
```
public static final String CIPHER_AES
```
    Default cipher for encryption
    
    See Also:
    
    Constant Field Values
  - CRYPTO_CIPHERPROVIDER_CONF_KEY
```
public static final String CRYPTO_CIPHERPROVIDER_CONF_KEY
```
    Configuration key for the crypto algorithm provider, a class name
    
    See Also:
    
    Constant Field Values
  - CRYPTO_KEYPROVIDER_CONF_KEY
```
public static final String CRYPTO_KEYPROVIDER_CONF_KEY
```
    Configuration key for the crypto key provider, a class name
    
    See Also:
    
    Constant Field Values
  - CRYPTO_KEYPROVIDER_PARAMETERS_KEY
```
public static final String CRYPTO_KEYPROVIDER_PARAMETERS_KEY
```
    Configuration key for the crypto key provider parameters
    
    See Also:
    
    Constant Field Values
  - CRYPTO_MASTERKEY_NAME_CONF_KEY
```
public static final String CRYPTO_MASTERKEY_NAME_CONF_KEY
```
    Configuration key for the name of the master key for the cluster, a string
    
    See Also:
    
    Constant Field Values
  - CRYPTO_MASTERKEY_ALTERNATE_NAME_CONF_KEY
```
public static final String CRYPTO_MASTERKEY_ALTERNATE_NAME_CONF_KEY
```
    Configuration key for the name of the alternate master key for the cluster, a string
    
    See Also:
    
    Constant Field Values
  - CRYPTO_WAL_ALGORITHM_CONF_KEY
```
public static final String CRYPTO_WAL_ALGORITHM_CONF_KEY
```
    Configuration key for the algorithm to use when encrypting the WAL, a string
    
    See Also:
    
    Constant Field Values
  - CRYPTO_WAL_KEY_NAME_CONF_KEY
```
public static final String CRYPTO_WAL_KEY_NAME_CONF_KEY
```
    Configuration key for the name of the master WAL encryption key for the cluster, a string
    
    See Also:
    
    Constant Field Values
  - CRYPTO_KEY_ALGORITHM_CONF_KEY
```
public static final String CRYPTO_KEY_ALGORITHM_CONF_KEY
```
    Configuration key for the algorithm used for creating jks key, a string
    
    See Also:
    
    Constant Field Values
  - CRYPTO_ALTERNATE_KEY_ALGORITHM_CONF_KEY
```
public static final String CRYPTO_ALTERNATE_KEY_ALGORITHM_CONF_KEY
```
    Configuration key for the name of the alternate cipher algorithm for the cluster, a string
    
    See Also:
    
    Constant Field Values
  - ENABLE_WAL_ENCRYPTION
```
public static final String ENABLE_WAL_ENCRYPTION
```
    Configuration key for enabling WAL encryption, a boolean
    
    See Also:
    
    Constant Field Values
  - RPC_CODEC_CONF_KEY
```
public static final String RPC_CODEC_CONF_KEY
```
    Configuration key for setting RPC codec class name
    
    See Also:
    
    Constant Field Values
  - REPLICATION_CODEC_CONF_KEY
```
public static final String REPLICATION_CODEC_CONF_KEY
```
    Configuration key for setting replication codec class name
    
    See Also:
    
    Constant Field Values
  - REPLICATION_SOURCE_MAXTHREADS_KEY
```
public static final String REPLICATION_SOURCE_MAXTHREADS_KEY
```
    Maximum number of threads used by the replication source for shipping edits to the sinks
    
    See Also:
    
    Constant Field Values
  - REPLICATION_DROP_ON_DELETED_TABLE_KEY
```
public static final String REPLICATION_DROP_ON_DELETED_TABLE_KEY
```
    Drop edits for tables that been deleted from the replication source and target
    
    See Also:
    
    Constant Field Values
  - REPLICATION_SOURCE_MAXTHREADS_DEFAULT
```
public static final int REPLICATION_SOURCE_MAXTHREADS_DEFAULT
```
    Maximum number of threads used by the replication source for shipping edits to the sinks
    
    See Also:
    
    Constant Field Values
  - HBASE_SPLITLOG_MANAGER_TIMEOUT
```
public static final String HBASE_SPLITLOG_MANAGER_TIMEOUT
```
    Configuration key for SplitLog manager timeout
    
    See Also:
    
    Constant Field Values
  - BUCKET_CACHE_IOENGINE_KEY
```
public static final String BUCKET_CACHE_IOENGINE_KEY
```
    Current ioengine options in include: heap, offheap and file:PATH (where PATH is the path to the file that will host the file-based cache. See BucketCache#getIOEngineFromName() for list of supported ioengine options.
    Set this option and a non-zero BUCKET_CACHE_SIZE_KEY to enable bucket cache.
    
    See Also:
    
    Constant Field Values
  - BUCKET_CACHE_SIZE_KEY
```
public static final String BUCKET_CACHE_SIZE_KEY
```
    When using bucket cache, this is a float that EITHER represents a percentage of total heap memory size to give to the cache (if < 1.0) OR, it is the capacity in megabytes of the cache.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_FAST_FAIL_MODE_ENABLED
```
public static final String HBASE_CLIENT_FAST_FAIL_MODE_ENABLED
```
    Config for enabling/disabling the fast fail mode.
    
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_ENABLE_FAST_FAIL_MODE_DEFAULT
```
public static final boolean HBASE_CLIENT_ENABLE_FAST_FAIL_MODE_DEFAULT
```
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_FAST_FAIL_THREASHOLD_MS
```
public static final String HBASE_CLIENT_FAST_FAIL_THREASHOLD_MS
```
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_FAST_FAIL_THREASHOLD_MS_DEFAULT
```
public static final long HBASE_CLIENT_FAST_FAIL_THREASHOLD_MS_DEFAULT
```
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_FAST_FAIL_CLEANUP_MS_DURATION_MS
```
public static final String HBASE_CLIENT_FAST_FAIL_CLEANUP_MS_DURATION_MS
```
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_FAST_FAIL_CLEANUP_DURATION_MS_DEFAULT
```
public static final long HBASE_CLIENT_FAST_FAIL_CLEANUP_DURATION_MS_DEFAULT
```
    See Also:
    
    Constant Field Values
  - HBASE_CLIENT_FAST_FAIL_INTERCEPTOR_IMPL
```
public static final String HBASE_CLIENT_FAST_FAIL_INTERCEPTOR_IMPL
```
    See Also:
    
    Constant Field Values
  - ENABLE_CLIENT_BACKPRESSURE
```
public static final String ENABLE_CLIENT_BACKPRESSURE
```
    Config key for if the server should send backpressure and if the client should listen to that backpressure from the server
    
    See Also:
    
    Constant Field Values
  - DEFAULT_ENABLE_CLIENT_BACKPRESSURE
```
public static final boolean DEFAULT_ENABLE_CLIENT_BACKPRESSURE
```
    See Also:
    
    Constant Field Values
  - HEAP_OCCUPANCY_LOW_WATERMARK_KEY
```
public static final String HEAP_OCCUPANCY_LOW_WATERMARK_KEY
```
    See Also:
    
    Constant Field Values
  - DEFAULT_HEAP_OCCUPANCY_LOW_WATERMARK
```
public static final float DEFAULT_HEAP_OCCUPANCY_LOW_WATERMARK
```
    See Also:
    
    Constant Field Values
  - HEAP_OCCUPANCY_HIGH_WATERMARK_KEY
```
public static final String HEAP_OCCUPANCY_HIGH_WATERMARK_KEY
```
    See Also:
    
    Constant Field Values
  - DEFAULT_HEAP_OCCUPANCY_HIGH_WATERMARK
```
public static final float DEFAULT_HEAP_OCCUPANCY_HIGH_WATERMARK
```
    See Also:
    
    Constant Field Values
  - REGION_SPLIT_THREADS_MAX
```
public static final String REGION_SPLIT_THREADS_MAX
```
    The max number of threads used for splitting storefiles in parallel during the region split process.
    
    See Also:
    
    Constant Field Values
  - HBASE_CANARY_WRITE_DATA_TTL_KEY
```
public static final String HBASE_CANARY_WRITE_DATA_TTL_KEY
```
    Canary config keys
    
    See Also:
    
    Constant Field Values
  - HBASE_CANARY_WRITE_PERSERVER_REGIONS_LOWERLIMIT_KEY
```
public static final String HBASE_CANARY_WRITE_PERSERVER_REGIONS_LOWERLIMIT_KEY
```
    See Also:
    
    Constant Field Values
  - HBASE_CANARY_WRITE_PERSERVER_REGIONS_UPPERLIMIT_KEY
```
public static final String HBASE_CANARY_WRITE_PERSERVER_REGIONS_UPPERLIMIT_KEY
```
    See Also:
    
    Constant Field Values
  - HBASE_CANARY_WRITE_VALUE_SIZE_KEY
```
public static final String HBASE_CANARY_WRITE_VALUE_SIZE_KEY
```
    See Also:
    
    Constant Field Values
  - HBASE_CANARY_WRITE_TABLE_CHECK_PERIOD_KEY
```
public static final String HBASE_CANARY_WRITE_TABLE_CHECK_PERIOD_KEY
```
    See Also:
    
    Constant Field Values
  - HBASE_CANARY_READ_RAW_SCAN_KEY
```
public static final String HBASE_CANARY_READ_RAW_SCAN_KEY
```
    See Also:
    
    Constant Field Values
  - ZK_CLIENT_KEYTAB_FILE
```
public static final String ZK_CLIENT_KEYTAB_FILE
```
    Configuration keys for programmatic JAAS configuration for secured ZK interaction
    
    See Also:
    
    Constant Field Values
  - ZK_CLIENT_KERBEROS_PRINCIPAL
```
public static final String ZK_CLIENT_KERBEROS_PRINCIPAL
```
    See Also:
    
    Constant Field Values
  - ZK_SERVER_KEYTAB_FILE
```
public static final String ZK_SERVER_KEYTAB_FILE
```
    See Also:
    
    Constant Field Values
  - ZK_SERVER_KERBEROS_PRINCIPAL
```
public static final String ZK_SERVER_KERBEROS_PRINCIPAL
```
    See Also:
    
    Constant Field Values
  - TEMPORARY_FS_DIRECTORY_KEY
```
public static final String TEMPORARY_FS_DIRECTORY_KEY
```
    Config key for hbase temporary directory in hdfs
    
    See Also:
    
    Constant Field Values
  - DEFAULT_TEMPORARY_HDFS_DIRECTORY
```
public static final String DEFAULT_TEMPORARY_HDFS_DIRECTORY
```
  - SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT
```
public static final String SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT
```
    See Also:
    
    Constant Field Values
  - DEFAULT_SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT
```
public static final boolean DEFAULT_SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT
```
    See Also:
    
    Constant Field Values
  - SNAPSHOT_RESTORE_FAILSAFE_NAME
```
public static final String SNAPSHOT_RESTORE_FAILSAFE_NAME
```
    See Also:
    
    Constant Field Values
  - DEFAULT_SNAPSHOT_RESTORE_FAILSAFE_NAME
```
public static final String DEFAULT_SNAPSHOT_RESTORE_FAILSAFE_NAME
```
    See Also:
    
    Constant Field Values
  - DEFAULT_LOSSY_COUNTING_ERROR_RATE
```
public static final String DEFAULT_LOSSY_COUNTING_ERROR_RATE
```
    See Also:
    
    Constant Field Values
  - NOT_IMPLEMENTED
```
public static final String NOT_IMPLEMENTED
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - HConstants
```
private HConstants()
```

Class HConstants

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

UTF8_ENCODING

UTF8_CHARSET

DEFAULT_BLOCKSIZE

INDEX_KEY_MAGIC

RECOVERED_EDITS_DIR

RPC_HEADER

RPC_CURRENT_VERSION

HFILEBLOCK_HEADER_SIZE_NO_CHECKSUM

HFILEBLOCK_HEADER_SIZE

HFILEBLOCK_DUMMY_HEADER

ZERO_L

NINES

ZEROES

VERSION_FILE_NAME

FILE_SYSTEM_VERSION

CLUSTER_DISTRIBUTED

HBASE_MASTER_LOADBALANCER_CLASS

HBASE_MASTER_LOADBALANCE_BYTABLE

HBASE_MASTER_BALANCER_MAX_RIT_PERCENT

DEFAULT_HBASE_MASTER_BALANCER_MAX_RIT_PERCENT

HBASE_BALANCER_MAX_BALANCING

HBASE_BALANCER_PERIOD

DEFAULT_HBASE_BALANCER_PERIOD

ENSEMBLE_TABLE_NAME

HBASE_MASTER_NORMALIZER_CLASS

CLUSTER_IS_LOCAL

CLUSTER_IS_DISTRIBUTED

DEFAULT_CLUSTER_DISTRIBUTED

DEFAULT_HOST

MASTER_PORT

DEFAULT_MASTER_PORT

DEFAULT_MASTER_INFOPORT

MASTER_INFO_PORT

MASTER_TYPE_BACKUP

DEFAULT_MASTER_TYPE_BACKUP

ZOOKEEPER_QUORUM

ZK_CFG_PROPERTY_PREFIX

ZK_CFG_PROPERTY_PREFIX_LEN

CLIENT_PORT_STR

ZOOKEEPER_CLIENT_PORT

DEFAULT_ZOOKEPER_CLIENT_PORT

ZOOKEEPER_RECOVERABLE_WAITTIME

DEFAULT_ZOOKEPER_RECOVERABLE_WAITIME

ZOOKEEPER_ZNODE_PARENT

DEFAULT_ZOOKEEPER_ZNODE_PARENT

ZOOKEEPER_MAX_CLIENT_CNXNS

ZOOKEEPER_DATA_DIR

ZOOKEEPER_TICK_TIME

DEFAULT_ZOOKEPER_MAX_CLIENT_CNXNS

ZK_SESSION_TIMEOUT

DEFAULT_ZK_SESSION_TIMEOUT

REGIONSERVER_PORT

DEFAULT_REGIONSERVER_PORT

DEFAULT_REGIONSERVER_INFOPORT

REGIONSERVER_INFO_PORT

REGIONSERVER_INFO_PORT_AUTO

REGION_SERVER_IMPL

MASTER_IMPL

HBASECLIENT_IMPL

THREAD_WAKE_FREQUENCY

DEFAULT_THREAD_WAKE_FREQUENCY

VERSION_FILE_WRITE_ATTEMPTS

DEFAULT_VERSION_FILE_WRITE_ATTEMPTS

MAJOR_COMPACTION_PERIOD

DEFAULT_MAJOR_COMPACTION_PERIOD

MAJOR_COMPACTION_JITTER

DEFAULT_MAJOR_COMPACTION_JITTER

COMPACTION_KV_MAX

COMPACTION_KV_MAX_DEFAULT

HBASE_DIR

HBASE_CLIENT_IPC_POOL_TYPE

HBASE_CLIENT_IPC_POOL_SIZE

HBASE_CLIENT_OPERATION_TIMEOUT