org.apache.hadoop.hbase.regionserver

Class HeapMemoryManager

java.lang.Object

org.apache.hadoop.hbase.regionserver.HeapMemoryManager

@InterfaceAudience.Private
public class HeapMemoryManager
extends Object

Manages tuning of Heap memory using HeapMemoryTuner. Most part of the heap memory is split between Memstores and BlockCache. This manager helps in tuning sizes of both these dynamically, as per the R/W load on the servers.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	HeapMemoryManager.HeapMemoryTuneObserver Every class that wants to observe heap memory tune actions must implement this interface.
static class	HeapMemoryManager.TunerContext POJO to pass all the relevant information required to do the heap memory tuning.
static class	HeapMemoryManager.TunerResult POJO which holds the result of memory tuning done by HeapMemoryTuner implementation.

Field Summary

Fields

Modifier and Type	Field and Description
static String	BLOCK_CACHE_SIZE_MAX_RANGE_KEY
static String	BLOCK_CACHE_SIZE_MIN_RANGE_KEY
static String	HBASE_RS_HEAP_MEMORY_TUNER_CLASS
static int	HBASE_RS_HEAP_MEMORY_TUNER_DEFAULT_PERIOD
static String	HBASE_RS_HEAP_MEMORY_TUNER_PERIOD
static float	HEAP_OCCUPANCY_ERROR_VALUE
static String	MEMSTORE_SIZE_MAX_RANGE_KEY
static String	MEMSTORE_SIZE_MIN_RANGE_KEY

Method Summary

Modifier and Type	Method and Description
static HeapMemoryManager	create(org.apache.hadoop.conf.Configuration conf, FlushRequester memStoreFlusher, Server server, RegionServerAccounting regionServerAccounting)
float	getHeapOccupancyPercent()
void	registerTuneObserver(HeapMemoryManager.HeapMemoryTuneObserver observer)
void	start(ChoreService service)
void	stop()

Methods inherited from class java.lang.Object

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

Field Detail

BLOCK_CACHE_SIZE_MAX_RANGE_KEY

public static final String BLOCK_CACHE_SIZE_MAX_RANGE_KEY

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Constant Field Values

BLOCK_CACHE_SIZE_MIN_RANGE_KEY

public static final String BLOCK_CACHE_SIZE_MIN_RANGE_KEY

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Constant Field Values

MEMSTORE_SIZE_MAX_RANGE_KEY

public static final String MEMSTORE_SIZE_MAX_RANGE_KEY

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Constant Field Values

MEMSTORE_SIZE_MIN_RANGE_KEY

public static final String MEMSTORE_SIZE_MIN_RANGE_KEY

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Constant Field Values

HBASE_RS_HEAP_MEMORY_TUNER_PERIOD

public static final String HBASE_RS_HEAP_MEMORY_TUNER_PERIOD

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Constant Field Values

HBASE_RS_HEAP_MEMORY_TUNER_DEFAULT_PERIOD

public static final int HBASE_RS_HEAP_MEMORY_TUNER_DEFAULT_PERIOD

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Constant Field Values

HBASE_RS_HEAP_MEMORY_TUNER_CLASS

public static final String HBASE_RS_HEAP_MEMORY_TUNER_CLASS

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Constant Field Values

HEAP_OCCUPANCY_ERROR_VALUE

public static final float HEAP_OCCUPANCY_ERROR_VALUE

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Constant Field Values

Method Detail

create

public static HeapMemoryManager create(org.apache.hadoop.conf.Configuration conf,
                                       FlushRequester memStoreFlusher,
                                       Server server,
                                       RegionServerAccounting regionServerAccounting)

start

public void start(ChoreService service)

stop

public void stop()

registerTuneObserver

public void registerTuneObserver(HeapMemoryManager.HeapMemoryTuneObserver observer)

getHeapOccupancyPercent

public float getHeapOccupancyPercent()

Returns:

heap occupancy percentage, 0 <= n <= 1. or -0.0 for error asking JVM