Package org.apache.hadoop.hbase.wal

Class EntryBuffers

java.lang.Object

org.apache.hadoop.hbase.wal.EntryBuffers

Direct Known Subclasses:

BoundedEntryBuffers

@Private
public class EntryBuffers
extends Object

Class which accumulates edits and separates them into a buffer per region while simultaneously accounting RAM usage. Blocks if the RAM usage crosses a predefined threshold. Writer threads then pull region-specific buffers from this class.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	EntryBuffers.RegionEntryBuffer	A buffer of some number of edits for a given region.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final Map<byte[],EntryBuffers.RegionEntryBuffer>	buffers
private final WALSplitter.PipelineController	controller
private final Set<byte[]>	currentlyWriting
private static final org.slf4j.Logger	LOG
protected final long	maxHeapUsage
protected long	totalBuffered

Constructor Summary

Constructors

Constructor	Description
EntryBuffers(WALSplitter.PipelineController controller, long maxHeapUsage)

Method Summary

Modifier and Type	Method	Description
void	appendEntry(WAL.Entry entry)	Append a log entry into the corresponding region buffer.
(package private) void	doneWriting(EntryBuffers.RegionEntryBuffer buffer)
(package private) EntryBuffers.RegionEntryBuffer	getChunkToWrite()	Returns RegionEntryBuffer a buffer of edits to be written.
(package private) boolean	isRegionCurrentlyWriting(byte[] region)
void	waitUntilDrained()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

LOG

private static final org.slf4j.Logger LOG

controller

private final WALSplitter.PipelineController controller

buffers

final Map<byte[],EntryBuffers.RegionEntryBuffer> buffers

currentlyWriting

private final Set<byte[]> currentlyWriting

totalBuffered

protected long totalBuffered

maxHeapUsage

protected final long maxHeapUsage

Constructor Details

EntryBuffers

public EntryBuffers(WALSplitter.PipelineController controller,
 long maxHeapUsage)

Method Details

appendEntry

public void appendEntry(WAL.Entry entry)
                 throws InterruptedException,
IOException

Append a log entry into the corresponding region buffer. Blocks if the total heap usage has crossed the specified threshold.

Throws:

InterruptedException

IOException

getChunkToWrite

EntryBuffers.RegionEntryBuffer getChunkToWrite()

Returns RegionEntryBuffer a buffer of edits to be written.

doneWriting

void doneWriting(EntryBuffers.RegionEntryBuffer buffer)

isRegionCurrentlyWriting

boolean isRegionCurrentlyWriting(byte[] region)

waitUntilDrained

public void waitUntilDrained()