org.apache.flink.runtime.executiongraph.failover

Class ExponentialDelayRestartBackoffTimeStrategy

java.lang.Object

org.apache.flink.runtime.executiongraph.failover.ExponentialDelayRestartBackoffTimeStrategy

All Implemented Interfaces:

RestartBackoffTimeStrategy

public class ExponentialDelayRestartBackoffTimeStrategy
extends Object
implements RestartBackoffTimeStrategy

Restart strategy which tries to restart indefinitely number of times with an exponential backoff time in between. The delay starts at initial value and keeps increasing (multiplying by backoff multiplier) until maximum delay is reached.

If the tasks are running smoothly for some time, backoff is reset to its initial value.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ExponentialDelayRestartBackoffTimeStrategy.ExponentialDelayRestartBackoffTimeStrategyFactory The factory for creating ExponentialDelayRestartBackoffTimeStrategy.

Nested classes/interfaces inherited from interface org.apache.flink.runtime.executiongraph.failover.RestartBackoffTimeStrategy

RestartBackoffTimeStrategy.Factory

Method Summary

Modifier and Type	Method and Description
boolean	canRestart() Returns whether a restart should be conducted.
static ExponentialDelayRestartBackoffTimeStrategy.ExponentialDelayRestartBackoffTimeStrategyFactory	createFactory(Configuration configuration)
long	getBackoffTime() Returns the delay to do the restarting.
boolean	notifyFailure(Throwable cause) Notify the strategy about the task failure cause.
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

canRestart

public boolean canRestart()

Description copied from interface: RestartBackoffTimeStrategy

Returns whether a restart should be conducted.

Specified by:

canRestart in interface RestartBackoffTimeStrategy

Returns:

whether a restart should be conducted

getBackoffTime

public long getBackoffTime()

Description copied from interface: RestartBackoffTimeStrategy

Returns the delay to do the restarting.

Specified by:

getBackoffTime in interface RestartBackoffTimeStrategy

Returns:

the delay to do the restarting

notifyFailure

public boolean notifyFailure(Throwable cause)

Description copied from interface: RestartBackoffTimeStrategy

Notify the strategy about the task failure cause.

Specified by:

notifyFailure in interface RestartBackoffTimeStrategy

Parameters:

cause - of the task failure

Returns:

True means that the current failure is the first one after the most-recent failure handling happened, false means that there has been a failure before that was not handled, yet, and the current failure will be considered in a combined failure handling effort.

toString

public String toString()

Overrides:

toString in class Object

createFactory

public static ExponentialDelayRestartBackoffTimeStrategy.ExponentialDelayRestartBackoffTimeStrategyFactory createFactory(Configuration configuration)