alluxio.job.plan.migrate

Class MigrateDefinition

java.lang.Object

alluxio.job.plan.AbstractVoidPlanDefinition<MigrateConfig,MigrateCommand>

alluxio.job.plan.migrate.MigrateDefinition

All Implemented Interfaces:

PlanDefinition<MigrateConfig,MigrateCommand,SerializableVoid>

public final class MigrateDefinition
extends AbstractVoidPlanDefinition<MigrateConfig,MigrateCommand>

A job that migrates a single file from source path to a destination path. The source and the destination can be across mount points.

Constructor Summary

Constructors

Constructor and Description
MigrateDefinition() Constructs a new MigrateDefinition.

Method Summary

Modifier and Type	Method and Description
Class<MigrateConfig>	getJobConfigClass()
SerializableVoid	runTask(MigrateConfig config, MigrateCommand command, RunTaskContext context) Runs the task in the executor.
Set<Pair<WorkerInfo,MigrateCommand>>	selectExecutors(MigrateConfig config, List<WorkerInfo> jobWorkerInfoList, SelectExecutorsContext context) Selects the workers to run the task.

Methods inherited from class alluxio.job.plan.AbstractVoidPlanDefinition

join

Methods inherited from class java.lang.Object

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

Constructor Detail

MigrateDefinition

public MigrateDefinition()

Constructs a new MigrateDefinition.

Method Detail

selectExecutors

public Set<Pair<WorkerInfo,MigrateCommand>> selectExecutors(MigrateConfig config,
                                                            List<WorkerInfo> jobWorkerInfoList,
                                                            SelectExecutorsContext context)
                                                     throws Exception

Selects the workers to run the task. Assigns each worker to migrate whichever files it has the most blocks for. If no worker has blocks for a file, a random worker is chosen.

Parameters:

config - the job configuration

jobWorkerInfoList - the list of available workers' information

context - the context containing information used to select executors

Returns:

Throws:

Exception - if any error occurs

runTask

public SerializableVoid runTask(MigrateConfig config,
                                MigrateCommand command,
                                RunTaskContext context)
                         throws Exception

Runs the task in the executor. Migrates the file specified in the config to the configured path. If the destination path is a directory, the file is migrated inside that directory.

Parameters:

config - the job configuration

command - the arguments passed in

context - the context containing information used to execute a task

Returns:

the task result

Throws:

Exception - if any error occurs

getJobConfigClass

public Class<MigrateConfig> getJobConfigClass()

Returns:

the class of the associated JobConfig