org.apache.druid.rpc.indexing

Class SpecificTaskRetryPolicy

java.lang.Object

org.apache.druid.rpc.indexing.SpecificTaskRetryPolicy

All Implemented Interfaces:

ServiceRetryPolicy

public class SpecificTaskRetryPolicy
extends Object
implements ServiceRetryPolicy

Retry policy for tasks. Meant to be used together with SpecificTaskServiceLocator. Returns true from retryHttpResponse(org.jboss.netty.handler.codec.http.HttpResponse) when encountering an HTTP 400 or HTTP 404 with a ChatHandlerResource.TASK_ID_HEADER header for a different task. This can happen when a task is suspended and then later restored in a different location, and then some *other* task reuses its old port. This task-mismatch scenario is retried indefinitely, since we expect that the SpecificTaskServiceLocator will update the location at some point.

Field Summary

Fields inherited from interface org.apache.druid.rpc.ServiceRetryPolicy

UNLIMITED

Constructor Summary

Constructors

Constructor and Description
SpecificTaskRetryPolicy(String taskId, ServiceRetryPolicy baseRetryPolicy)

Method Summary

Modifier and Type	Method and Description
long	maxAttempts() Returns the maximum number of desired attempts, or ServiceRetryPolicy.UNLIMITED if unlimited.
long	maxWaitMillis() Returns the maximum wait time between retries.
long	minWaitMillis() Returns the minimum wait time between retries.
boolean	retryHttpResponse(org.jboss.netty.handler.codec.http.HttpResponse response) Returns whether the given HTTP response can be retried.
boolean	retryNotAvailable() Returns whether service-not-available, i.e.
boolean	retryThrowable(Throwable t) Returns whether the given exception can be retried.

Methods inherited from class java.lang.Object

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

Constructor Detail

SpecificTaskRetryPolicy

public SpecificTaskRetryPolicy(String taskId,
                               ServiceRetryPolicy baseRetryPolicy)

Method Detail

maxAttempts

public long maxAttempts()

Description copied from interface: ServiceRetryPolicy

Returns the maximum number of desired attempts, or ServiceRetryPolicy.UNLIMITED if unlimited. A value of 1 means no retries. Zero is invalid.

Specified by:

maxAttempts in interface ServiceRetryPolicy

minWaitMillis

public long minWaitMillis()

Description copied from interface: ServiceRetryPolicy

Returns the minimum wait time between retries.

Specified by:

minWaitMillis in interface ServiceRetryPolicy

maxWaitMillis

public long maxWaitMillis()

Description copied from interface: ServiceRetryPolicy

Returns the maximum wait time between retries.

Specified by:

maxWaitMillis in interface ServiceRetryPolicy

retryHttpResponse

public boolean retryHttpResponse(org.jboss.netty.handler.codec.http.HttpResponse response)

Description copied from interface: ServiceRetryPolicy

Returns whether the given HTTP response can be retried. The response will have a non-2xx error code.

Specified by:

retryHttpResponse in interface ServiceRetryPolicy

retryThrowable

public boolean retryThrowable(Throwable t)

Description copied from interface: ServiceRetryPolicy

Returns whether the given exception can be retried.

Specified by:

retryThrowable in interface ServiceRetryPolicy

retryNotAvailable

public boolean retryNotAvailable()

Description copied from interface: ServiceRetryPolicy

Returns whether service-not-available, i.e. empty ServiceLocations.getLocations(), can be retried.

Specified by:

retryNotAvailable in interface ServiceRetryPolicy