com.hazelcast.spi.hotrestart.impl.gc.chunk

Class StableTombChunk

java.lang.Object

com.hazelcast.spi.hotrestart.impl.gc.chunk.Chunk

com.hazelcast.spi.hotrestart.impl.gc.chunk.StableChunk

com.hazelcast.spi.hotrestart.impl.gc.chunk.StableTombChunk

All Implemented Interfaces:

com.hazelcast.nio.Disposable

public final class StableTombChunk
extends StableChunk

Stable tombstone chunk.

Field Summary

Fields inherited from class com.hazelcast.spi.hotrestart.impl.gc.chunk.StableChunk

BY_BENEFIT_COST_DESC

Fields inherited from class com.hazelcast.spi.hotrestart.impl.gc.chunk.Chunk

ACTIVE_FNAME_SUFFIX, FNAME_SUFFIX, garbage, liveRecordCount, records, seq, SURVIVOR_FNAME_SUFFIX, SYSPROP_TOMB_CHUNK_SIZE_LIMIT, SYSPROP_VAL_CHUNK_SIZE_LIMIT, TOMB_BASEDIR, TOMB_SIZE_LIMIT_DEFAULT, VAL_BASEDIR, VAL_SIZE_LIMIT_DEFAULT

Constructor Summary

Constructors

Constructor and Description
StableTombChunk(long seq, RecordMap records, int liveRecordCount, long size, long garbage)

Method Summary

Modifier and Type	Method and Description
String	base()
static double	benefitToCost(long garbage, long size) Calculates the Benefit-Cost factor.
void	disposeFilePosToKeyHandle() Disposes the file position-to-key handle map.
KeyHandle	getLiveKeyHandle(long filePos)
int[]	initFilePosToKeyHandle() Initializes the file position-to-key handle map used during TombGC to look up a tombstone at a given file position, in order to determine its liveness status.
void	needsDismissing(boolean needsDismissing) Sets whether the "dismiss prefix garbage" operation is needed for this chunk.
void	retire(KeyHandle kh, Record r, boolean mayIncrementGarbageCount) Retires a record in this chunk (makes it dead).
double	updateBenefitToCost() Updates the cached value of the Benefit-Cost factor.

Methods inherited from class com.hazelcast.spi.hotrestart.impl.gc.chunk.StableChunk

cachedBenefitToCost, size

Methods inherited from class com.hazelcast.spi.hotrestart.impl.gc.chunk.Chunk

dispose, fnameSuffix, needsDismissing, retire, tombChunkSizeLimit, toString, valChunkSizeLimit

Methods inherited from class java.lang.Object

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

Constructor Detail

StableTombChunk

public StableTombChunk(long seq,
                       RecordMap records,
                       int liveRecordCount,
                       long size,
                       long garbage)

Method Detail

base

public String base()

Overrides:

base in class Chunk

Returns:

name of the base directory of this chunk (within the owning Hot Restart store's home dir)

retire

public void retire(KeyHandle kh,
                   Record r,
                   boolean mayIncrementGarbageCount)

Description copied from class: Chunk

Retires a record in this chunk (makes it dead).

Overrides:

retire in class Chunk

Parameters:

kh - key handle of the record

r - the record to retire

mayIncrementGarbageCount - whether it is appropriate to increment the garbage count for this key handle

needsDismissing

public void needsDismissing(boolean needsDismissing)

Description copied from class: Chunk

Sets whether the "dismiss prefix garbage" operation is needed for this chunk.

Overrides:

needsDismissing in class Chunk

initFilePosToKeyHandle

public int[] initFilePosToKeyHandle()

Initializes the file position-to-key handle map used during TombGC to look up a tombstone at a given file position, in order to determine its liveness status.

Returns:

array of the file positions of all currently live tombstones, in ascending order.

getLiveKeyHandle

public KeyHandle getLiveKeyHandle(long filePos)

Parameters:

filePos - a file position in this tombstone chunk

Returns:

the key handle of the tombstone at the supplied position, if that tombstone is still alive

disposeFilePosToKeyHandle

public void disposeFilePosToKeyHandle()

Disposes the file position-to-key handle map.

updateBenefitToCost

public double updateBenefitToCost()

Updates the cached value of the Benefit-Cost factor.

Returns:

the value just calculated

benefitToCost

public static double benefitToCost(long garbage,
                                   long size)

Calculates the Benefit-Cost factor.

Parameters:

garbage - amount of garbage bytes in a chunk

size - total bytes in a chunk