Package org.apache.hadoop.mapred.gridmix.emulators.resourceusage

Class TotalHeapUsageEmulatorPlugin.DefaultHeapUsageEmulator

java.lang.Object

org.apache.hadoop.mapred.gridmix.emulators.resourceusage.TotalHeapUsageEmulatorPlugin.DefaultHeapUsageEmulator

All Implemented Interfaces:

TotalHeapUsageEmulatorPlugin.HeapUsageEmulatorCore

Enclosing class:

TotalHeapUsageEmulatorPlugin

public static class TotalHeapUsageEmulatorPlugin.DefaultHeapUsageEmulator
extends java.lang.Object
implements TotalHeapUsageEmulatorPlugin.HeapUsageEmulatorCore

This is the core engine to emulate the heap usage. The only responsibility of this class is to perform certain memory intensive operations to make sure that some desired value of heap is used.

Constructor Summary

Constructors

Constructor	Description
DefaultHeapUsageEmulator()

Method Summary

Modifier and Type	Method	Description
int	getHeapSpaceSize()	Gets the total number of 1mb objects stored in the emulator.
void	initialize(org.apache.hadoop.yarn.util.ResourceCalculatorPlugin monitor, long totalHeapUsageInMB)	This will initialize the core and check if the core can emulate the desired target on the underlying hardware.
void	load(long sizeInMB)	Increase heap usage by current process by the given amount.
void	reset()	Clear references to all the GridMix-allocated special objects so that heap usage is reduced.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultHeapUsageEmulator

public DefaultHeapUsageEmulator()

Method Detail

load

public void load(long sizeInMB)

Increase heap usage by current process by the given amount. This is done by creating objects each of size 1MB.

Specified by:

load in interface TotalHeapUsageEmulatorPlugin.HeapUsageEmulatorCore

getHeapSpaceSize

@VisibleForTesting
public int getHeapSpaceSize()

Gets the total number of 1mb objects stored in the emulator.

Returns:

total number of 1mb objects.

initialize

public void initialize(org.apache.hadoop.yarn.util.ResourceCalculatorPlugin monitor,
                       long totalHeapUsageInMB)

This will initialize the core and check if the core can emulate the desired target on the underlying hardware.

Specified by:

initialize in interface TotalHeapUsageEmulatorPlugin.HeapUsageEmulatorCore

reset

public void reset()

Clear references to all the GridMix-allocated special objects so that heap usage is reduced.

Specified by:

reset in interface TotalHeapUsageEmulatorPlugin.HeapUsageEmulatorCore