Package org.apache.hadoop.tools.fedbalance.procedure

Class BalanceJournalInfoHDFS

java.lang.Object

org.apache.hadoop.tools.fedbalance.procedure.BalanceJournalInfoHDFS

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, BalanceJournal

public class BalanceJournalInfoHDFS
extends java.lang.Object
implements BalanceJournal

BalanceJournal based on HDFS. This class stores all the journals in the HDFS. The jobs are persisted into the HDFS and recovered from the HDFS.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BalanceJournalInfoHDFS.IdGenerator

Field Summary

Fields

Modifier and Type	Field	Description
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor	Description
BalanceJournalInfoHDFS()

Method Summary

Modifier and Type	Method	Description
void	clear(BalanceJob job)	Clear all the journals of this job.
org.apache.hadoop.conf.Configuration	getConf()
BalanceJob[]	listAllJobs()	List all unfinished jobs.
void	recoverJob(BalanceJob job)	Recover job from journal on HDFS.
void	saveJob(BalanceJob job)	Save job journal to HDFS.
void	setConf(org.apache.hadoop.conf.Configuration conf)

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.slf4j.Logger LOG

Constructor Detail

BalanceJournalInfoHDFS

public BalanceJournalInfoHDFS()

Method Detail

saveJob

public void saveJob(BalanceJob job)
             throws java.io.IOException

Save job journal to HDFS. All the journals are saved in the path base-dir. Each job has an individual directory named after the job id. When a job is saved, a new journal file is created. The file's name consists of a prefix 'JOB-' and an incremental sequential id. The file with the largest id is the latest journal of this job. Layout: base-dir/ /job-3f1da5e5-2a60-48de-8736-418d134edbe9/ /JOB-0 /JOB-3 /JOB-5 /job-ebc19478-2324-46c2-8d1a-2f8c4391dc09/ /JOB-1 /JOB-2 /JOB-4

Specified by:

saveJob in interface BalanceJournal

Throws:

java.io.IOException

recoverJob

public void recoverJob(BalanceJob job)
                throws java.io.IOException

Recover job from journal on HDFS.

Specified by:

recoverJob in interface BalanceJournal

Throws:

java.io.IOException

listAllJobs

public BalanceJob[] listAllJobs()
                         throws java.io.IOException

Description copied from interface: BalanceJournal

List all unfinished jobs.

Specified by:

listAllJobs in interface BalanceJournal

Throws:

java.io.IOException

clear

public void clear(BalanceJob job)
           throws java.io.IOException

Description copied from interface: BalanceJournal

Clear all the journals of this job.

Specified by:

clear in interface BalanceJournal

Throws:

java.io.IOException

setConf

public void setConf(org.apache.hadoop.conf.Configuration conf)

Specified by:

setConf in interface org.apache.hadoop.conf.Configurable

getConf

public org.apache.hadoop.conf.Configuration getConf()

Specified by:

getConf in interface org.apache.hadoop.conf.Configurable