Package org.apache.ignite.internal.processors.cache.persistence.snapshot

Class AbstractSnapshotVerificationTask

java.lang.Object

org.apache.ignite.compute.ComputeTaskAdapter<SnapshotPartitionsVerifyTaskArg,SnapshotPartitionsVerifyTaskResult>

org.apache.ignite.internal.processors.cache.persistence.snapshot.AbstractSnapshotVerificationTask

All Implemented Interfaces:

Serializable, ComputeTask<SnapshotPartitionsVerifyTaskArg,SnapshotPartitionsVerifyTaskResult>

Direct Known Subclasses:

IncrementalSnapshotVerificationTask, SnapshotHandlerRestoreTask, SnapshotPartitionsVerifyTask

public abstract class AbstractSnapshotVerificationTask
extends ComputeTaskAdapter<SnapshotPartitionsVerifyTaskArg,SnapshotPartitionsVerifyTaskResult>

The task for checking the consistency of snapshots in the cluster.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	AbstractSnapshotVerificationTask.AbstractSnapshotVerificationJob

Field Summary

Fields

Modifier and Type	Field	Description
protected IgniteEx	ignite	Ignite instance.
protected IgniteLogger	log	Injected logger.
protected Map<ClusterNode,List<SnapshotMetadata>>	metas	Map of snapshot metadata information found on each cluster node.

Constructor Summary

Constructors

Constructor	Description
AbstractSnapshotVerificationTask()

Method Summary

Modifier and Type	Method	Description
protected abstract AbstractSnapshotVerificationTask.AbstractSnapshotVerificationJob	createJob(String name, String consId, SnapshotPartitionsVerifyTaskArg args)
Map<ComputeJob,ClusterNode>	map(List<ClusterNode> subgrid, SnapshotPartitionsVerifyTaskArg arg)	This method is called to map or split grid task into multiple grid jobs.
ComputeJobResultPolicy	result(ComputeJobResult res, List<ComputeJobResult> rcvd)	Default implementation which will wait for all jobs to complete before calling ComputeTask.reduce(List) method.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.ignite.compute.ComputeTask

reduce

Field Detail

metas

protected final Map<ClusterNode,List<SnapshotMetadata>> metas

Map of snapshot metadata information found on each cluster node.

ignite

@IgniteInstanceResource
protected IgniteEx ignite

Ignite instance.

log

@LoggerResource
protected IgniteLogger log

Injected logger.

Constructor Detail

AbstractSnapshotVerificationTask

public AbstractSnapshotVerificationTask()

Method Detail

map

public Map<ComputeJob,ClusterNode> map(List<ClusterNode> subgrid,
                                             SnapshotPartitionsVerifyTaskArg arg)

This method is called to map or split grid task into multiple grid jobs. This is the first method that gets called when task execution starts.

Parameters:

subgrid - Nodes available for this task execution. Note that order of nodes is guaranteed to be randomized by container. This ensures that every time you simply iterate through grid nodes, the order of nodes will be random which over time should result into all nodes being used equally.

arg - Task execution argument. Can be null. This is the same argument as the one passed into Grid#execute(...) methods.

Returns:

Map of grid jobs assigned to subgrid node. Unless ComputeTaskContinuousMapper is injected into task, if null or empty map is returned, exception will be thrown.

result

public ComputeJobResultPolicy result(ComputeJobResult res,
                                     List<ComputeJobResult> rcvd)
                              throws IgniteException

Default implementation which will wait for all jobs to complete before calling ComputeTask.reduce(List) method.

If remote job resulted in exception (ComputeJobResult.getException() is not null), then ComputeJobResultPolicy.FAILOVER policy will be returned if the exception is instance of ClusterTopologyException or ComputeExecutionRejectedException, which means that remote node either failed or job execution was rejected before it got a chance to start. In all other cases the exception will be rethrown which will ultimately cause task to fail.

Specified by:

result in interface ComputeTask<SnapshotPartitionsVerifyTaskArg,SnapshotPartitionsVerifyTaskResult>

Overrides:

result in class ComputeTaskAdapter<SnapshotPartitionsVerifyTaskArg,SnapshotPartitionsVerifyTaskResult>

Parameters:

res - Received remote grid executable result.

rcvd - All previously received results.

Returns:

Result policy that dictates how to process further upcoming job results.

Throws:

IgniteException - If handling a job result caused an error effectively rejecting a failover. This exception will be thrown out of ComputeTaskFuture.get() method.

createJob

protected abstract AbstractSnapshotVerificationTask.AbstractSnapshotVerificationJob createJob(String name,
                                                                                              String consId,
                                                                                              SnapshotPartitionsVerifyTaskArg args)

Parameters:

name - Snapshot name.

consId - Consistent id of the related node.

args - Check snapshot parameters.

Returns:

Compute job.