org.apache.hadoop.hbase.regionserver

Class ImmutableMemStoreLAB

java.lang.Object

org.apache.hadoop.hbase.regionserver.ImmutableMemStoreLAB

All Implemented Interfaces:

MemStoreLAB

@InterfaceAudience.Private
public class ImmutableMemStoreLAB
extends Object
implements MemStoreLAB

A MemStoreLAB implementation which wraps N MemStoreLABs. Its main duty is in proper managing the close of the individual MemStoreLAB. This is treated as an immutable one and so do not allow to add any more Cells into it. copyCellInto(Cell) throws Exception

Field Summary

Fields inherited from interface org.apache.hadoop.hbase.regionserver.MemStoreLAB

CHUNK_POOL_INITIALSIZE_KEY, CHUNK_POOL_MAXSIZE_KEY, CHUNK_SIZE_DEFAULT, CHUNK_SIZE_KEY, MAX_ALLOC_DEFAULT, MAX_ALLOC_KEY, MSLAB_CLASS_NAME, POOL_INITIAL_SIZE_DEFAULT, POOL_MAX_SIZE_DEFAULT, USEMSLAB_DEFAULT, USEMSLAB_KEY

Constructor Summary

Constructors

Constructor and Description
ImmutableMemStoreLAB(List<MemStoreLAB> mslabs)

Method Summary

Modifier and Type	Method and Description
void	close() Close instance since it won't be used any more, try to put the chunks back to pool
Cell	copyCellInto(Cell cell) Allocates slice in this LAB and copy the passed Cell into this area.
void	decScannerCount() Called when closing a scanner on the data of this MemStoreLAB
Cell	forceCopyOfBigCellInto(Cell cell) Allocates slice in this LAB and copy the passed Cell into this area.
Chunk	getNewExternalChunk()
Chunk	getNewExternalJumboChunk(int size)
void	incScannerCount() Called when opening a scanner on the data of this MemStoreLAB

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hbase.regionserver.MemStoreLAB

isEnabled, newInstance

Constructor Detail

ImmutableMemStoreLAB

public ImmutableMemStoreLAB(List<MemStoreLAB> mslabs)

Method Detail

copyCellInto

public Cell copyCellInto(Cell cell)

Description copied from interface: MemStoreLAB

Allocates slice in this LAB and copy the passed Cell into this area. Returns new Cell instance over the copied the data. When this MemStoreLAB can not copy this Cell, it returns null.

Specified by:

copyCellInto in interface MemStoreLAB

forceCopyOfBigCellInto

public Cell forceCopyOfBigCellInto(Cell cell)

Description copied from interface: MemStoreLAB

Allocates slice in this LAB and copy the passed Cell into this area. Returns new Cell instance over the copied the data. When this MemStoreLAB can not copy this Cell, it returns null. Since the process of flattening to CellChunkMap assumes all cells are allocated on MSLAB, and since copyCellInto does not copy big cells (for whom size > maxAlloc) into MSLAB, this method is called while the process of flattening to CellChunkMap is running, for forcing the allocation of big cells on this MSLAB.

Specified by:

forceCopyOfBigCellInto in interface MemStoreLAB

getNewExternalChunk

public Chunk getNewExternalChunk()

Specified by:

getNewExternalChunk in interface MemStoreLAB

getNewExternalJumboChunk

public Chunk getNewExternalJumboChunk(int size)

Specified by:

getNewExternalJumboChunk in interface MemStoreLAB

close

public void close()

Description copied from interface: MemStoreLAB

Close instance since it won't be used any more, try to put the chunks back to pool

Specified by:

close in interface MemStoreLAB

incScannerCount

public void incScannerCount()

Description copied from interface: MemStoreLAB

Called when opening a scanner on the data of this MemStoreLAB

Specified by:

incScannerCount in interface MemStoreLAB

decScannerCount

public void decScannerCount()

Description copied from interface: MemStoreLAB

Called when closing a scanner on the data of this MemStoreLAB

Specified by:

decScannerCount in interface MemStoreLAB