Package org.apache.hadoop.tools.fedbalance

Class TrashProcedure

java.lang.Object

org.apache.hadoop.tools.fedbalance.procedure.BalanceProcedure

org.apache.hadoop.tools.fedbalance.TrashProcedure

All Implemented Interfaces:

org.apache.hadoop.io.Writable

public class TrashProcedure
extends BalanceProcedure

This procedure moves the source path to the corresponding trash.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.tools.fedbalance.procedure.BalanceProcedure

BalanceProcedure.RetryException

Field Summary

Fields inherited from class org.apache.hadoop.tools.fedbalance.procedure.BalanceProcedure

LOG

Constructor Summary

Constructors

Constructor	Description
TrashProcedure()
TrashProcedure(java.lang.String name, java.lang.String nextProcedure, long delayDuration, FedBalanceContext context)	The constructor of TrashProcedure.

Method Summary

Modifier and Type	Method	Description
boolean	execute()	The main process.
FedBalanceContext	getContext()
void	readFields(java.io.DataInput in)
void	write(java.io.DataOutput out)

Methods inherited from class org.apache.hadoop.tools.fedbalance.procedure.BalanceProcedure

delayMillisBeforeRetry, equals, hashCode, isSchedulerShutdown, name, nextProcedure, setNextProcedure, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

TrashProcedure

public TrashProcedure()

TrashProcedure

public TrashProcedure(java.lang.String name,
                      java.lang.String nextProcedure,
                      long delayDuration,
                      FedBalanceContext context)
               throws java.io.IOException

The constructor of TrashProcedure.

Parameters:

name - the name of the procedure.

nextProcedure - the name of the next procedure.

delayDuration - the delay duration when this procedure is delayed.

context - the federation balance context.

Throws:

java.io.IOException

Method Detail

execute

public boolean execute()
                throws java.io.IOException

Description copied from class: BalanceProcedure

The main process. This is called by the ProcedureScheduler. Make sure the process quits fast when it's interrupted and the scheduler is shut down. One procedure may have many phases and all the phases share the same member variables. Each time this method returns, the journal is saved. User can serialize the current phase in write(DataOutput) so the job can continue with the last unfinished phase after it is recovered. The return value indicates whether the job should go to the next procedure. Return true after all the phases finish. Example: class ProcedureWithManyPhase extends BalanceProcedure { enum PHASE { P1, P2, P3 } PHASE phase; public boolean execute(T lastProcedure) throws RetryException, IOException { switch (phase) { case P1: // do something. return false; case P2: // do something. return false; case P3: // do something. return true; default: throw new IOException("Unexpected phase " + phase); } } public void write(DataOutput out) { out.writeInt(phase.ordinal()); } public void readFields(DataInput in) throws IOException { stage = Stage.values()[in.readInt()]; } }

Specified by:

execute in class BalanceProcedure

Returns:

true if the procedure has done and the job will go to the next procedure, otherwise false.

Throws:

java.io.IOException

getContext

public FedBalanceContext getContext()

write

public void write(java.io.DataOutput out)
           throws java.io.IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Overrides:

write in class BalanceProcedure

Throws:

java.io.IOException

readFields

public void readFields(java.io.DataInput in)
                throws java.io.IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Overrides:

readFields in class BalanceProcedure

Throws:

java.io.IOException