org.apache.hadoop.hbase.wal

Class EntryBuffers

java.lang.Object

org.apache.hadoop.hbase.wal.EntryBuffers

Direct Known Subclasses:

BoundedEntryBuffers

@InterfaceAudience.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 and Description
static class	EntryBuffers.RegionEntryBuffer A buffer of some number of edits for a given region.

Field Summary

Fields

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and 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()
(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 Detail

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 Detail

EntryBuffers

public EntryBuffers(WALSplitter.PipelineController controller,
                    long maxHeapUsage)

Method Detail

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()