com.hazelcast.instance

Class DefaultOutOfMemoryHandler

java.lang.Object

com.hazelcast.core.OutOfMemoryHandler

com.hazelcast.instance.DefaultOutOfMemoryHandler

Direct Known Subclasses:

ClientOutOfMemoryHandler

@PrivateApi
public class DefaultOutOfMemoryHandler
extends OutOfMemoryHandler

Default OutOfMemoryHandler implementation that tries to release local resources (threads, connections, memory) immediately and disconnects members from the rest of the cluster.

Field Summary

Fields

Modifier and Type	Field and Description
static String	FREE_MAX_PERCENTAGE_PROP

Constructor Summary

Constructors

Constructor and Description
DefaultOutOfMemoryHandler()
DefaultOutOfMemoryHandler(double freeVersusMaxRatio)
DefaultOutOfMemoryHandler(double freeVersusMaxRatio, MemoryInfoAccessor memoryInfoAccessor)

Method Summary

Modifier and Type	Method and Description
void	onOutOfMemory(OutOfMemoryError oome, HazelcastInstance[] hazelcastInstances) When an OutOfMemoryError is caught by Hazelcast threads, this method is called for ALL HazelcastInstances knows by current JVM (actually ClassLoader).
boolean	shouldHandle(OutOfMemoryError oome) Decides if the OutOfMemoryError thrown will be handled by this OutOfMemoryHandler or not.

Methods inherited from class com.hazelcast.core.OutOfMemoryHandler

tryCloseConnections, tryShutdown

Methods inherited from class java.lang.Object

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

Field Detail

FREE_MAX_PERCENTAGE_PROP

public static final String FREE_MAX_PERCENTAGE_PROP

See Also:

Constant Field Values

Constructor Detail

DefaultOutOfMemoryHandler

public DefaultOutOfMemoryHandler()

DefaultOutOfMemoryHandler

public DefaultOutOfMemoryHandler(double freeVersusMaxRatio)

DefaultOutOfMemoryHandler

public DefaultOutOfMemoryHandler(double freeVersusMaxRatio,
                                 MemoryInfoAccessor memoryInfoAccessor)

Method Detail

onOutOfMemory

public void onOutOfMemory(OutOfMemoryError oome,
                          HazelcastInstance[] hazelcastInstances)

Description copied from class: OutOfMemoryHandler

When an OutOfMemoryError is caught by Hazelcast threads, this method is called for ALL HazelcastInstances knows by current JVM (actually ClassLoader).

User can shutdown the HazelcastInstance, call System.exit(), just log the error, etc. The default handler tries to close socket connections to other nodes and shutdown the HazelcastInstance.

Warning: OutOfMemoryHandler may not be called even if JVM throws OutOfMemoryError because the error may be thrown from an external (user) thread and Hazelcast may not be informed about OutOfMemoryError.

Specified by:

onOutOfMemory in class OutOfMemoryHandler

Parameters:

oome - OutOfMemoryError thrown by JVM

hazelcastInstances - All HazelcastInstances known by JVM, can include inactive or NULL instances.

See Also:

OutOfMemoryHandler.tryCloseConnections(HazelcastInstance), OutOfMemoryHandler.tryShutdown(HazelcastInstance)

shouldHandle

public boolean shouldHandle(OutOfMemoryError oome)

Description copied from class: OutOfMemoryHandler

Decides if the OutOfMemoryError thrown will be handled by this OutOfMemoryHandler or not. If true is return, OutOfMemoryHandler.onOutOfMemory(OutOfMemoryError, HazelcastInstance[]) will be called to handle error, otherwise OutOfMemoryError will be ignored.

Overrides:

shouldHandle in class OutOfMemoryHandler

Parameters:

oome - OutOfMemoryError thrown by JVM

Returns:

true if OutOfMemoryError will be handled, false otherwise