Package org.apache.hadoop.hbase.regionserver.wal

Interface Summary

Interface	Description
MetricsWALSource	Interface of the source that will export metrics about the region server's WAL.
WALActionsListener	Get notification of WAL events.
WALCellCodec.ByteStringCompressor
WALCellCodec.ByteStringUncompressor

Class Summary

Class	Description
AbstractFSWAL<W extends WALProvider.WriterBase>	Implementation of WAL to go against FileSystem; i.e.
AbstractFSWAL.WalProps
AbstractProtobufLogWriter	Base class for Protobuf log writer.
AsyncFSWAL	An asynchronous implementation of FSWAL.
AsyncProtobufLogWriter	AsyncWriter for protobuf-based WAL.
AsyncProtobufLogWriter.OutputStreamWrapper
CompressionContext	Context that holds the various dictionaries for compression in WAL.
CompressionContext.ValueCompressor	Encapsulates the compression algorithm and its streams that we will use for value compression in this WAL.
Compressor	A set of static functions for running our custom WAL compression/decompression.
FSHLog	The original implementation of FSWAL.
FSHLog.RingBufferExceptionHandler	Exception handler to pass the disruptor ringbuffer.
FSHLog.SafePointZigZagLatch	This class is used coordinating two threads holding one thread at a 'safe point' while the orchestrating thread does some work that requires the first thread paused: e.g.
FSWALEntry	A WAL Entry for AbstractFSWAL implementation.
MetricsWAL	Class used to push numbers about the WAL into the metrics subsystem.
MetricsWALSourceImpl	Class that transitions metrics from MetricsWAL into the metrics subsystem.
ProtobufLogReader	A Protobuf based WAL has the following structure:
ProtobufLogReader.WALHdrContext
ProtobufLogWriter	Writer for protobuf-based WAL.
ReaderBase
RingBufferTruck	A 'truck' to carry a payload across the ring buffer from Handler to WAL.
SecureAsyncProtobufLogWriter
SecureProtobufLogReader
SecureProtobufLogWriter
SecureWALCellCodec	A WALCellCodec that encrypts the WALedits.
SecureWALCellCodec.EncryptedKvDecoder
SecureWALCellCodec.EncryptedKvEncoder
SequenceIdAccounting	Accounting of sequence ids per region and then by column family.
SyncFuture	A Future on a filesystem sync call.
SyncFutureCache	A cache of SyncFutures.
WALCellCodec	Compression in this class is lifted off Compressor/KeyValueCompression.
WALCellCodec.BaosAndCompressor
WALCellCodec.CompressedKvDecoder
WALCellCodec.CompressedKvEncoder
WALCellCodec.EnsureKvEncoder
WALCellCodec.NoneCompressor
WALCellCodec.NoneUncompressor
WALCellCodec.StatelessUncompressor
WALCoprocessorHost	Implements the coprocessor environment and runtime support for coprocessors loaded within a WAL.
WALCoprocessorHost.WALEnvironment	Encapsulation of the environment of each coprocessor
WALUtil	Helper methods to ease Region Server integration with the Write Ahead Log (WAL).

Enum Summary

Enum	Description
CompressionContext.DictionaryIndex
ProtobufLogReader.WALHdrResult
RingBufferTruck.Type
WALActionsListener.RollRequestReason	The reason for the log roll request.

Exception Summary

Exception	Description
DamagedWALException	Thrown when a failed append or sync on a WAL.
FailedLogCloseException	Thrown when we fail close of the write-ahead-log file.
FailedSyncBeforeLogCloseException	Thrown when we fail close of the write-ahead-log file.