Package org.apache.hadoop.hbase.util

Interface Summary

Interface	Description
Addressing.AddressSelectionCondition	Interface for AddressSelectionCondition to check if address is acceptable
AvlUtil.AvlInsertOrReplace<TNode extends AvlUtil.AvlNode>
AvlUtil.AvlKeyComparator<TNode extends AvlUtil.AvlNode>	The AvlTree allows to lookup an object using a custom key.
AvlUtil.AvlNodeVisitor<TNode extends AvlUtil.AvlNode>	Visitor that allows to traverse a set of AvlNodes.
BloomFilter	Implements a Bloom filter, as defined by Bloom in 1970.
BloomFilterBase	Common methods Bloom filter methods required at read and write time.
BloomFilterWriter	Specifies methods needed to add elements to a Bloom filter and serialize the resulting Bloom filter as a sequence of bytes.
ByteBufferAllocator	Defines the way the ByteBuffers are created
ByteBufferArray.Visitor
ByteRange	Lightweight, reusable class for specifying ranges of byte[]'s.
Bytes.Comparer<T>
CancelableProgressable	Similar interface as Progressable but returns a boolean to support canceling the operation.
ConcurrentMapUtils.IOExceptionSupplier<V>	A supplier that throws IOException when get.
EnvironmentEdge	Has some basic interaction with the environment.
FileStatusFilter
FSUtils.ProgressReporter	Called every so-often by storefile map builder getTableStoreFilePathMap to report progress.
FSVisitor.StoreFileVisitor
HbckErrorReporter	Deprecated Since 2.3.0.
JSONBean.Writer	Use dumping out mbeans as JSON.
KeyRange	A key range use in split coverage.
LossyCounting.LossyCountingListener
ModifyRegionUtils.RegionEditTask
ModifyRegionUtils.RegionFillTask
ObjectPool.ObjectFactory<K,V>	An ObjectFactory object is used to create new shared objects on demand.
PoolMap.Pool<R>
PositionedByteRange	Extends ByteRange with additional methods to support tracking a consumers position within the viewport.
RegionSplitter.SplitAlgorithm	A generic interface for the RegionSplitter code to use for all it's functionality.
Threads.PrintThreadInfoHelper
TimeMeasurable<T>	Methods that implement this interface can be measured elapsed time.

Class Summary

Class	Description
AbstractByteRange	An abstract implementation of the ByteRange API
AbstractFileStatusFilter	Typical base class for file status filter.
AbstractHBaseTool	Common base class used for HBase command-line tools.
AbstractPositionedByteRange	Extends the basic SimpleByteRange implementation with position support.
Addressing	Utility for network addresses, resolving and naming.
AtomicUtils	Utilities related to atomic operations.
AvlUtil	Helper class that allows to create and manipulate an AvlTree.
AvlUtil.AvlIterableList	Helper class that allows to create and manipulate a linked list of AvlLinkedNodes
AvlUtil.AvlLinkedNode<TNode extends AvlUtil.AvlLinkedNode>	This class extends the AvlNode and adds two links that will be used in conjunction with the AvlIterableList class.
AvlUtil.AvlNode<TNode extends AvlUtil.AvlNode>	This class represent a node that will be used in an AvlTree.
AvlUtil.AvlTree	Helper class that allows to create and manipulate an AVL Tree
AvlUtil.AvlTreeIterator<TNode extends AvlUtil.AvlNode>	Iterator for the AvlTree
BloomContext	The bloom context that is used by the StorefileWriter to add the bloom details per cell
BloomFilterChunk	The basic building block for the CompoundBloomFilter
BloomFilterFactory	Handles Bloom filter initialization based on configuration and serialized metadata in the reader and writer of HStoreFile.
BloomFilterUtil	Utility methods related to BloomFilters
BoundedCompletionService<V>	A completion service, close to the one available in the JDK 1.7 However, this ones keeps the list of the future, and allows to cancel them all.
BoundedPriorityBlockingQueue<E>	A generic bounded blocking Priority-Queue.
BoundedPriorityBlockingQueue.PriorityQueue<E>
ByteArrayHashKey
ByteBufferArray	This class manages an array of ByteBuffers with a default size 4MB.
ByteBufferArray.BufferCreatorCallable	A callable that creates buffers of the specified length either onheap/offheap using the ByteBufferAllocator
ByteBufferUtils	Utility functions for working with byte buffers, such as reading/writing variable-length long numbers.
ByteBufferUtils.Comparer
ByteBufferUtils.ComparerHolder
ByteBufferUtils.ComparerHolder.PureJavaComparer
ByteBufferUtils.ComparerHolder.UnsafeComparer
ByteBufferUtils.Converter
ByteBufferUtils.ConverterHolder
ByteBufferUtils.ConverterHolder.PureJavaConverter
ByteBufferUtils.ConverterHolder.UnsafeConverter
ByteRangeUtils	Utility methods for working with ByteRange.
Bytes	Utility class that handles byte arrays, conversions to/from other types, comparisons, hash code generation, manufacturing keys for HashMaps or HashSets, and can be used as key in maps or trees.
Bytes.ByteArrayComparator	Byte array comparator class.
Bytes.Converter
Bytes.ConverterHolder
Bytes.ConverterHolder.PureJavaConverter
Bytes.ConverterHolder.UnsafeConverter
Bytes.LexicographicalComparerHolder	Provides a lexicographical comparer implementation; either a Java implementation or a faster implementation based on Unsafe.
Bytes.RowEndKeyComparator	A Bytes.ByteArrayComparator that treats the empty array as the largest value.
ByteStringer	Hack to workaround HBASE-10304 issue that keeps bubbling up when a mapreduce context.
CellHashKey	Extracts the byte for the hash calculation from the given cell
Classes	Utilities for class manipulation.
ClassLoaderBase	Base class loader that defines couple shared constants used by sub-classes.
ClassSize	Class for determining the "size" of a class, an attempt to calculate the actual bytes that an object of this class will occupy in memory The core of this class is taken from the Derby project
ClassSize.MemoryLayout	MemoryLayout abstracts details about the JVM object layout.
ClassSize.UnsafeLayout	UnsafeLayout uses Unsafe to guesstimate the object-layout related parameters like object header sizes and oop sizes See HBASE-15950.
ClassSize.UnsafeLayout.HeaderSize
ClientUtils	Common Utility class for clients
CollectionBackedScanner	Utility scanner that wraps a sortable collection and serves as a KeyValueScanner.
CollectionUtils	Deprecated Since 2.0.6/2.1.3/2.2.0
CommonFSUtils	Utility methods for interacting with the underlying file system.
CommonFSUtils.DfsBuilderUtility
CommonFSUtils.StreamCapabilities
CompressionTest	Compression validation test.
ConcatenatedLists<T>	A collection class that contains multiple sub-lists, which allows us to not copy lists.
ConcurrentMapUtils	Utility methods for dealing with Collections, including treating null collections as empty.
ConfigurationUtil	Utilities for storing more complex collection types in Configuration instances.
ConnectionCache	A utility to store user specific HConnections in memory.
CoprocessorClassLoader	ClassLoader used to load classes for Coprocessor instances.
Counter	Deprecated since 2.0.0 and will be removed in 3.0.0.
Counter.Cell
Counter.Container
DefaultEnvironmentEdge	Default implementation of an environment edge.
DirectMemoryUtils	Utilities for interacting with and monitoring DirectByteBuffer allocations.
DNS	Wrapper around Hadoop's DNS class to hide reflection.
DynamicClassLoader	This is a class loader that can load classes dynamically from new jar files under a configured folder.
EncryptionTest
EnvironmentEdgeManager	Manages a singleton instance of the environment edge.
ExceptionUtil	This class handles the different interruption classes.
ExponentialMovingAverage	EMA is similar to WeightedMovingAverage in weighted, but the weighting factor decrease exponentially.
ForeignExceptionUtil	Helper to convert Exceptions and StackTraces from/to protobuf.
FSHDFSUtils	Implementation for hdfs
FSRegionScanner	Thread that walks over the filesystem, and computes the mappings Region -> BestHost and Region -> Map<HostName, fractional-locality-of-region>
FSTableDescriptors	Implementation of TableDescriptors that reads descriptors from the passed filesystem.
FSUtils	Utility methods for interacting with the underlying file system.
FSUtils.BlackListDirFilter	Directory filter that doesn't include any of the directories in the specified blacklist
FSUtils.DirFilter	A PathFilter that only allows directories.
FSUtils.FamilyDirFilter	Filter for all dirs that are legal column family names.
FSUtils.FileFilter	A PathFilter that returns only regular files.
FSUtils.HFileFilter	Filter for HFiles that excludes reference files.
FSUtils.HFileLinkFilter	Filter for HFileLinks (StoreFiles and HFiles not included).
FSUtils.ReferenceFileFilter
FSUtils.RegionDirFilter	Filter for all dirs that don't start with '.'
FSUtils.UserTableDirFilter	A PathFilter that returns usertable directories.
FSVisitor	Utility methods for interacting with the hbase.root file system.
FutureUtils	Helper class for processing futures.
GetJavaProperty	A generic way for querying Java properties.
GsonUtil	Helper class for gson.
Hash	This class represents a common API for hashing functions.
HashedBytes	This class encapsulates a byte array and overrides hashCode and equals so that it's identity is based on the data rather than the array instance.
HashKey<T>	Used to calculate the hash Hash algorithms for Bloomfilters.
HasThread	Abstract class which contains a Thread and delegates the common Thread methods to that instance.
HBaseConfTool	Tool that prints out a configuration.
HBaseFsck	Deprecated For removal in hbase-4.0.0.
HBaseFsck.FileLockCallable
HBaseFsck.HBaseFsckTool	This is a Tool wrapper that gathers -Dxxx=yyy configuration settings from the command line.
HBaseFsck.PrintingErrorReporter
HBaseFsck.RegionBoundariesInformation
HBaseFsck.WorkItemHdfsRegionInfo	Contact hdfs and get all information about specified table directory into regioninfo list.
HBaseFsck.WorkItemOverlapMerge
HBaseFsck.WorkItemRegion	Contact a region server and get all information from it
HBaseFsckRepair	This class contains helper methods that repair parts of hbase's filesystem contents.
HbckRegionInfo	Maintain information about a particular region.
HbckRegionInfo.HdfsEntry	Stores the regioninfo entries from HDFS
HbckRegionInfo.MetaEntry	Stores the regioninfo entries scanned from META
HbckRegionInfo.OnlineEntry	Stores the regioninfo retrieved from Online region servers.
HbckTableInfo	Maintain information about a particular table.
HFileArchiveUtil	Helper class for all utilities related to archival/retrieval of HFiles
IdLock	Allows multiple concurrent clients to lock on a numeric id with a minimal memory overhead.
IdLock.Entry	An entry returned to the client as a lock object
IdReadWriteLock<T>	Allows multiple concurrent clients to lock on a numeric id with ReentrantReadWriteLock.
ImmutableByteArray	Mainly used as keys for HashMap.
IncrementingEnvironmentEdge	Uses an incrementing algorithm instead of the default.
JenkinsHash	Produces 32-bit hash for hash table lookup.
JRubyFormat	Utility class for converting objects to JRuby.
JSONBean	Utility for doing JSON and MBeans.
JsonMapper	Utility class for converting objects to JSON
JSONMetricUtil
JVM	This class is a wrapper for the implementation of com.sun.management.UnixOperatingSystemMXBean It will decide to use the sun api or its own implementation depending on the runtime (vendor) used.
JVMClusterUtil	Utility used running a cluster all in the one JVM.
JVMClusterUtil.MasterThread	Datastructure to hold Master Thread and Master instance
JVMClusterUtil.RegionServerThread	Datastructure to hold RegionServer Thread and RegionServer instance
JvmPauseMonitor	Class which sets up a simple thread which runs in a loop sleeping for a short interval of time.
JvmPauseMonitor.GcTimes
JvmVersion	Certain JVM versions are known to be unstable with HBase.
KeyLocker<K>	A utility class to manage a set of locks.
LossyCounting	LossyCounting utility, bounded data structure that maintains approximate high frequency elements in data stream.
ManualEnvironmentEdge	An environment edge that uses a manually set value.
MapreduceDependencyClasspathTool	Generate a classpath string containing any jars required by mapreduce jobs.
MapReduceExtendedCell	A wrapper for a cell to be used with mapreduce, as the output value class for mappers/reducers.
MD5Hash	Utility class for MD5 MD5 hash produces a 128-bit digest.
Methods
ModifyRegionUtils	Utility methods for interacting with the regions.
MovingAverage<T>	The purpose of introduction of MovingAverage mainly is to measure execution time of a specific method, which can help us to know its performance fluctuation in response to different machine states or situations, better case, then to act accordingly.
MultiHConnection	Provides ability to create multiple Connection instances and allows to process a batch of actions using CHTable.doBatchWithCallback()
MunkresAssignment	Computes the optimal (minimal cost) assignment of jobs to workers (or other analogous) concepts given a cost matrix of each pair of job and worker, using the algorithm by James Munkres in "Algorithms for the Assignment and Transportation Problems", with additional optimizations as described by Jin Kue Wong in "A New Implementation of an Algorithm for the Optimal Assignment Problem: An Improved Version of Munkres' Algorithm".
MurmurHash	This is a very fast, non-cryptographic hash suitable for general hash-based lookup.
MurmurHash3	This is a very fast, non-cryptographic hash suitable for general hash-based lookup.
NettyEventLoopGroupConfig	Event loop group related config.
NonceKey	This implementation is not smart and just treats nonce group and nonce as random bits.
ObjectIntPair<T>	A generic class for pair of an Object and and a primitive int value.
ObjectPool<K,V>	A thread-safe shared object pool in which object creation is expected to be lightweight, and the objects may be excessively created and discarded.
OrderedBytes	Utility class that handles ordered byte arrays.
Pair<T1,T2>	A generic class for pairs.
PairOfSameType<T>	A generic, immutable class for pairs of objects both of type T.
PoolMap<K,V>	The PoolMap maps a key to a collection of values, the elements of which are managed by a pool.
PoolMap.ReusablePool<R>	The ReusablePool represents a PoolMap.Pool that builds on the LinkedList class.
PoolMap.RoundRobinPool<R>	The RoundRobinPool represents a PoolMap.Pool, which stores its resources in an ArrayList.
PoolMap.ThreadLocalPool<R>	The ThreadLocalPool represents a PoolMap.Pool that builds on the ThreadLocal class.
PrettyPrinter
ProcessUtils	Process related utilities.
Random64	An instance of this class is used to generate a stream of pseudorandom numbers.
ReflectionUtils
RegionMover	Tool for loading/unloading regions to/from given regionserver This tool can be run from Command line directly as a utility.
RegionMover.RegionMoverBuilder	Builder for Region mover.
RegionSplitCalculator<R extends KeyRange>	This is a generic region split calculator.
RegionSplitter	The RegionSplitter class provides several utilities to help in the administration lifecycle for developers who choose to manually split regions instead of having HBase handle that automatically.
RegionSplitter.DecimalStringSplit	The format of a DecimalStringSplit region boundary is the ASCII representation of reversed sequential number, or any other uniformly distributed decimal value.
RegionSplitter.HexStringSplit	HexStringSplit is a well-known RegionSplitter.SplitAlgorithm for choosing region boundaries.
RegionSplitter.NumberStringSplit
RegionSplitter.UniformSplit	A SplitAlgorithm that divides the space of possible keys evenly.
RetryCounter	Operation retry accounting.
RetryCounter.BackoffPolicy	Policy for calculating sleeping intervals between retry attempts
RetryCounter.ExponentialBackoffPolicy
RetryCounter.ExponentialBackoffPolicyWithLimit
RetryCounter.RetryConfig	Configuration for a retry counter
RetryCounterFactory
RollingStatCalculator	This class maintains mean and variation for any sequence of input provided to it.
RowBloomContext	Handles ROW bloom related context.
RowBloomHashKey
RowColBloomContext	Handles ROWCOL bloom related context.
RowColBloomHashKey	An hash key for ROWCOL bloom.
RowPrefixFixedLengthBloomContext	Handles ROWPREFIX bloom related context.
ServerCommandLine	Base class for command lines that start up various HBase daemons.
ServerRegionReplicaUtil	Similar to RegionReplicaUtil but for the server side
ShutdownHookManager	This class provides ShutdownHookManager shims for HBase to interact with the Hadoop 1.0.x and the Hadoop 2.0+ series.
ShutdownHookManager.ShutdownHookManagerV1
ShutdownHookManager.ShutdownHookManagerV2
SimpleByteRange	A read only version of the ByteRange.
SimpleMovingAverage	SMA measure the overall average execution time of a specific method.
SimpleMutableByteRange	A basic mutable ByteRange implementation.
SimplePositionedByteRange	Extends the basic SimpleMutableByteRange implementation with position support and it is a readonly version.
SimplePositionedMutableByteRange	Extends the basic AbstractPositionedByteRange implementation with position support and it is a mutable version.
Sleeper	Sleeper for current thread.
SoftObjectPool<K,V>	A SoftReference based shared object pool.
SortedList<E>	Simple sorted list implementation that uses ArrayList as the underlying collection so we can support RandomAccess.
StealJobQueue<T>	This queue allows a ThreadPoolExecutor to steal jobs from another ThreadPoolExecutor.
Strings	Utility for Strings.
TableDescriptorChecker	Only used for master to sanity check TableDescriptor.
Threads	Thread Utility
Threads.PrintThreadInfoLazyHolder
Triple<A,B,C>	Utility class to manage a triple.
UnsafeAccess
UnsafeAvailChecker
VersionInfo	This class finds the Version information for HBase.
WeakObjectPool<K,V>	A WeakReference based shared object pool.
WeightedMovingAverage	Different from SMA SimpleMovingAverage, WeightedMovingAverage gives each data different weight.
WindowMovingAverage	Instead of calculate a whole time average, this class focus on the last N.
Writables	Utility class with methods for manipulating Writable objects
YammerHistogramUtils	Utility functions for working with Yammer Metrics.
ZKDataMigrator	Deprecated Since 2.0.0.

Enum Summary

Enum	Description
Bytes.LexicographicalComparerHolder.PureJavaComparer
Bytes.LexicographicalComparerHolder.UnsafeComparer
ChecksumType	Checksum types.
HbckErrorReporter.ERROR_CODE
IdReadWriteLock.ReferenceType
Order	Used to describe or modify the lexicographical sort order of a byte[].
PoolMap.PoolType
PrettyPrinter.Unit

Exception Summary

Exception	Description
CommonFSUtils.StreamLacksCapabilityException	Helper exception for those cases where the place where we need to check a stream capability is not where we have the needed context to explain the impact and mitigation for a lack.
FileSystemVersionException	Thrown when the file system needs to be upgraded
LeaseNotRecoveredException	Thrown when the lease was expected to be recovered, but the file can't be opened.
ReadOnlyByteRangeException	Exception thrown when a read only byte range is modified