org.apache.hadoop.hbase.regionserver

Class MemStoreFlusher

java.lang.Object

org.apache.hadoop.hbase.regionserver.MemStoreFlusher

All Implemented Interfaces:

FlushRequester

@InterfaceAudience.Private
public class MemStoreFlusher
extends Object
implements FlushRequester

Thread that flushes cache on request NOTE: This class extends Thread rather than Chore because the sleep time can be interrupted when there is something to do, rather than the Chore sleep time which is invariant.

See Also:

FlushRequester

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<Region,org.apache.hadoop.hbase.regionserver.MemStoreFlusher.FlushRegionEntry>	regionsInQueue

Constructor Summary

Constructors

Constructor and Description
MemStoreFlusher(org.apache.hadoop.conf.Configuration conf, HRegionServer server)

Method Summary

Modifier and Type	Method and Description
String	dumpQueue()
int	getFlushQueueSize()
LongAdder	getUpdatesBlockedMsHighWater()
void	reclaimMemStoreMemory() Check if the regionserver's memstore memory usage is greater than the limit.
void	registerFlushRequestListener(FlushRequestListener listener) Register a MemstoreFlushListener
boolean	requestDelayedFlush(HRegion r, long delay) Tell the listener the cache needs to be flushed after a delay
boolean	requestFlush(HRegion r, FlushLifeCycleTracker tracker) Tell the listener the cache needs to be flushed.
boolean	requestFlush(HRegion r, List<byte[]> families, FlushLifeCycleTracker tracker) Tell the listener the cache needs to be flushed.
void	setGlobalMemStoreLimit(long globalMemStoreSize) Sets the global memstore limit to a new size.
String	toString()
boolean	unregisterFlushRequestListener(FlushRequestListener listener) Unregister the listener from MemstoreFlushListeners

Methods inherited from class java.lang.Object

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

Field Detail

regionsInQueue

protected final Map<Region,org.apache.hadoop.hbase.regionserver.MemStoreFlusher.FlushRegionEntry> regionsInQueue

Constructor Detail

MemStoreFlusher

public MemStoreFlusher(org.apache.hadoop.conf.Configuration conf,
                       HRegionServer server)

Method Detail

getUpdatesBlockedMsHighWater

public LongAdder getUpdatesBlockedMsHighWater()

requestFlush

public boolean requestFlush(HRegion r,
                            FlushLifeCycleTracker tracker)

Description copied from interface: FlushRequester

Tell the listener the cache needs to be flushed.

Specified by:

requestFlush in interface FlushRequester

Parameters:

r - the Region requesting the cache flush

Returns:

true if our region is added into the queue, false otherwise

requestFlush

public boolean requestFlush(HRegion r,
                            List<byte[]> families,
                            FlushLifeCycleTracker tracker)

Description copied from interface: FlushRequester

Tell the listener the cache needs to be flushed.

Specified by:

requestFlush in interface FlushRequester

Parameters:

r - the Region requesting the cache flush

families - stores of region to flush, if null then use flush policy

Returns:

true if our region is added into the queue, false otherwise

requestDelayedFlush

public boolean requestDelayedFlush(HRegion r,
                                   long delay)

Description copied from interface: FlushRequester

Tell the listener the cache needs to be flushed after a delay

Specified by:

requestDelayedFlush in interface FlushRequester

Parameters:

r - the Region requesting the cache flush

delay - after how much time should the flush happen

Returns:

true if our region is added into the queue, false otherwise

getFlushQueueSize

public int getFlushQueueSize()

reclaimMemStoreMemory

public void reclaimMemStoreMemory()

Check if the regionserver's memstore memory usage is greater than the limit. If so, flush regions with the biggest memstores until we're down to the lower limit. This method blocks callers until we're down to a safe amount of memstore consumption.

toString

public String toString()

Overrides:

toString in class Object

dumpQueue

public String dumpQueue()

registerFlushRequestListener

public void registerFlushRequestListener(FlushRequestListener listener)

Register a MemstoreFlushListener

Specified by:

registerFlushRequestListener in interface FlushRequester

unregisterFlushRequestListener

public boolean unregisterFlushRequestListener(FlushRequestListener listener)

Unregister the listener from MemstoreFlushListeners

Specified by:

unregisterFlushRequestListener in interface FlushRequester

Returns:

true when passed listener is unregistered successfully.

setGlobalMemStoreLimit

public void setGlobalMemStoreLimit(long globalMemStoreSize)

Sets the global memstore limit to a new size.

Specified by:

setGlobalMemStoreLimit in interface FlushRequester