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From "Dan Adkins (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2060) IOException: Filesystem closed on submitJob
Date Mon, 13 Sep 2010 23:13:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909039#action_12909039
] 

Dan Adkins commented on MAPREDUCE-2060:
---------------------------------------

I'm not sure exactly how to provide a repro.  I hit this every time.  I just restarted my
jobtracker and hit the "Filesystem closed" error right away: no need to even submit a job.
 My jobtracker is run as user mr20, the namenode is run as user hd20 on the same node.  Here
are their logs:

************************************************************/
10/09/13 23:04:52 INFO mapred.JobTracker: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting JobTracker
STARTUP_MSG:   host = hns4.sea1.qc/10.2.12.100
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 0.22.0-qc
STARTUP_MSG:   classpath = /home/mr20/bin/../conf:/usr/java/default/lib/tools.jar:/home/mr20/bin/..:/home/mr20/bin/../hadoop-common-0.22.0-qc.jar:/home/mr20/bin/../hadoop-hdfs-0.22.0-qc.jar:/home/mr20/bin/../hadoop-mapred-0.22.0-qc.jar:/home/mr20/bin/../lib/ant-1.6.5.jar:/home/mr20/bin/../lib/asm-3.2.jar:/home/mr20/bin/../lib/aspectjrt-1.6.5.jar:/home/mr20/bin/../lib/aspectjtools-1.6.5.jar:/home/mr20/bin/../lib/avro-1.3.2.jar:/home/mr20/bin/../lib/commons-cli-1.2.jar:/home/mr20/bin/../lib/commons-codec-1.4.jar:/home/mr20/bin/../lib/commons-el-1.0.jar:/home/mr20/bin/../lib/commons-httpclient-3.1.jar:/home/mr20/bin/../lib/commons-lang-2.5.jar:/home/mr20/bin/../lib/commons-logging-1.1.1.jar:/home/mr20/bin/../lib/commons-logging-api-1.1.jar:/home/mr20/bin/../lib/commons-net-1.4.1.jar:/home/mr20/bin/../lib/core-3.1.1.jar:/home/mr20/bin/../lib/ftplet-api-1.0.0.jar:/home/mr20/bin/../lib/ftpserver-core-1.0.0.jar:/home/mr20/bin/../lib/ftpserver-deprecated-1.0.0-M2.jar:/home/mr20/bin/../lib/hadoop-0.22.0-qc-fairscheduler.jar:/home/mr20/bin/../lib/hsqldb-1.8.0.10.jar:/home/mr20/bin/../lib/jackson-core-asl-1.4.2.jar:/home/mr20/bin/../lib/jackson-mapper-asl-1.4.2.jar:/home/mr20/bin/../lib/jasper-compiler-5.5.12.jar:/home/mr20/bin/../lib/jasper-runtime-5.5.12.jar:/home/mr20/bin/../lib/jdiff-1.0.9.jar:/home/mr20/bin/../lib/jets3t-0.7.1.jar:/home/mr20/bin/../lib/jetty-6.1.14.jar:/home/mr20/bin/../lib/jetty-util-6.1.14.jar:/home/mr20/bin/../lib/jsp-2.1-6.1.14.jar:/home/mr20/bin/../lib/jsp-api-2.1-6.1.14.jar:/home/mr20/bin/../lib/junit-4.8.1.jar:/home/mr20/bin/../lib/kfs-0.3.jar:/home/mr20/bin/../lib/log4j-1.2.15.jar:/home/mr20/bin/../lib/mina-core-2.0.0-M5.jar:/home/mr20/bin/../lib/mockito-all-1.8.2.jar:/home/mr20/bin/../lib/oro-2.0.8.jar:/home/mr20/bin/../lib/paranamer-2.2.jar:/home/mr20/bin/../lib/paranamer-ant-2.2.jar:/home/mr20/bin/../lib/paranamer-generator-2.2.jar:/home/mr20/bin/../lib/qdox-1.10.1.jar:/home/mr20/bin/../lib/servlet-api-2.5-6.1.14.jar:/home/mr20/bin/../lib/slf4j-api-1.5.11.jar:/home/mr20/bin/../lib/slf4j-log4j12-1.5.11.jar:/home/mr20/bin/../lib/xmlenc-0.52.jar:/home/mr20/bin/../lib/jsp-2.1/*.jar:/home/mr20:/home/mr20/conf:/home/mr20/hadoop-mapred-0.22.0-qc.jar:/home/mr20/lib/ant-1.6.5.jar:/home/mr20/lib/asm-3.2.jar:/home/mr20/lib/aspectjrt-1.6.5.jar:/home/mr20/lib/aspectjtools-1.6.5.jar:/home/mr20/lib/avro-1.3.2.jar:/home/mr20/lib/commons-cli-1.2.jar:/home/mr20/lib/commons-codec-1.4.jar:/home/mr20/lib/commons-el-1.0.jar:/home/mr20/lib/commons-httpclient-3.1.jar:/home/mr20/lib/commons-lang-2.5.jar:/home/mr20/lib/commons-logging-1.1.1.jar:/home/mr20/lib/commons-logging-api-1.1.jar:/home/mr20/lib/commons-net-1.4.1.jar:/home/mr20/lib/core-3.1.1.jar:/home/mr20/lib/ftplet-api-1.0.0.jar:/home/mr20/lib/ftpserver-core-1.0.0.jar:/home/mr20/lib/ftpserver-deprecated-1.0.0-M2.jar:/home/mr20/lib/hadoop-0.22.0-qc-fairscheduler.jar:/home/mr20/lib/hsqldb-1.8.0.10.jar:/home/mr20/lib/jackson-core-asl-1.4.2.jar:/home/mr20/lib/jackson-mapper-asl-1.4.2.jar:/home/mr20/lib/jasper-compiler-5.5.12.jar:/home/mr20/lib/jasper-runtime-5.5.12.jar:/home/mr20/lib/jdiff-1.0.9.jar:/home/mr20/lib/jets3t-0.7.1.jar:/home/mr20/lib/jetty-6.1.14.jar:/home/mr20/lib/jetty-util-6.1.14.jar:/home/mr20/lib/jsp-2.1-6.1.14.jar:/home/mr20/lib/jsp-api-2.1-6.1.14.jar:/home/mr20/lib/junit-4.8.1.jar:/home/mr20/lib/kfs-0.3.jar:/home/mr20/lib/log4j-1.2.15.jar:/home/mr20/lib/mina-core-2.0.0-M5.jar:/home/mr20/lib/mockito-all-1.8.2.jar:/home/mr20/lib/oro-2.0.8.jar:/home/mr20/lib/paranamer-2.2.jar:/home/mr20/lib/paranamer-ant-2.2.jar:/home/mr20/lib/paranamer-generator-2.2.jar:/home/mr20/lib/qdox-1.10.1.jar:/home/mr20/lib/servlet-api-2.5-6.1.14.jar:/home/mr20/lib/slf4j-api-1.5.11.jar:/home/mr20/lib/slf4j-log4j12-1.5.11.jar:/home/mr20/lib/xmlenc-0.52.jar:/home/mr20:/home/mr20/hadoop-mapred-0.22.0-qc.jar:/home/mr20/lib/ant-1.6.5.jar:/home/mr20/lib/asm-3.2.jar:/home/mr20/lib/aspectjrt-1.6.5.jar:/home/mr20/lib/aspectjtools-1.6.5.jar:/home/mr20/lib/avro-1.3.2.jar:/home/mr20/lib/commons-cli-1.2.jar:/home/mr20/lib/commons-codec-1.4.jar:/home/mr20/lib/commons-el-1.0.jar:/home/mr20/lib/commons-httpclient-3.1.jar:/home/mr20/lib/commons-lang-2.5.jar:/home/mr20/lib/commons-logging-1.1.1.jar:/home/mr20/lib/commons-logging-api-1.1.jar:/home/mr20/lib/commons-net-1.4.1.jar:/home/mr20/lib/core-3.1.1.jar:/home/mr20/lib/ftplet-api-1.0.0.jar:/home/mr20/lib/ftpserver-core-1.0.0.jar:/home/mr20/lib/ftpserver-deprecated-1.0.0-M2.jar:/home/mr20/lib/hadoop-0.22.0-qc-fairscheduler.jar:/home/mr20/lib/hsqldb-1.8.0.10.jar:/home/mr20/lib/jackson-core-asl-1.4.2.jar:/home/mr20/lib/jackson-mapper-asl-1.4.2.jar:/home/mr20/lib/jasper-compiler-5.5.12.jar:/home/mr20/lib/jasper-runtime-5.5.12.jar:/home/mr20/lib/jdiff-1.0.9.jar:/home/mr20/lib/jets3t-0.7.1.jar:/home/mr20/lib/jetty-6.1.14.jar:/home/mr20/lib/jetty-util-6.1.14.jar:/home/mr20/lib/jsp-2.1-6.1.14.jar:/home/mr20/lib/jsp-api-2.1-6.1.14.jar:/home/mr20/lib/junit-4.8.1.jar:/home/mr20/lib/kfs-0.3.jar:/home/mr20/lib/log4j-1.2.15.jar:/home/mr20/lib/mina-core-2.0.0-M5.jar:/home/mr20/lib/mockito-all-1.8.2.jar:/home/mr20/lib/oro-2.0.8.jar:/home/mr20/lib/paranamer-2.2.jar:/home/mr20/lib/paranamer-ant-2.2.jar:/home/mr20/lib/paranamer-generator-2.2.jar:/home/mr20/lib/qdox-1.10.1.jar:/home/mr20/lib/servlet-api-2.5-6.1.14.jar:/home/mr20/lib/slf4j-api-1.5.11.jar:/home/mr20/lib/slf4j-log4j12-1.5.11.jar:/home/mr20/lib/xmlenc-0.52.jar
STARTUP_MSG:   build = git://dadkins-l.corp.qc/Users/dadkins/sandbox/hadoop-git/hadoop-common
-r f8cf1bbc93e1091991961eac871cc3132015c4a9; compiled by 'dadkins' on Thu Sep  9 13:57:06
PDT 2010
************************************************************/
10/09/13 23:04:58 INFO mapred.JobTracker: Starting jobtracker with owner as mr20 and supergroup
as supergroup
10/09/13 23:04:58 INFO delegation.AbstractDelegationTokenSecretManager: Updating the current
master key for generating delegation tokens
10/09/13 23:04:58 INFO mapred.JobTracker: Scheduler configured with (memSizeForMapSlotOnJT,
memSizeForReduceSlotOnJT, limitMaxMemForMapTasks, limitMaxMemForReduceTasks) (-1, -1, -1,
-1)
10/09/13 23:04:58 INFO delegation.AbstractDelegationTokenSecretManager: Starting expired delegation
token remover thread, tokenRemoverScanInterval=60 min(s)
10/09/13 23:04:58 INFO delegation.AbstractDelegationTokenSecretManager: Updating the current
master key for generating delegation tokens
10/09/13 23:04:58 INFO util.HostsFileReader: Refreshing hosts (include/exclude) list
10/09/13 23:04:58 INFO mapred.QueueManager: AllQueues : {default=default}; LeafQueues : {default=default}
10/09/13 23:04:58 INFO ipc.Server: Starting SocketReader
10/09/13 23:04:58 INFO metrics.RpcMetrics: Initializing RPC Metrics with hostName=JobTracker,
port=31000
10/09/13 23:04:58 INFO metrics.RpcDetailedMetrics: Initializing RPC Metrics with hostName=JobTracker,
port=31000
10/09/13 23:04:58 INFO mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log)
via org.mortbay.log.Slf4jLog
10/09/13 23:04:59 INFO http.HttpServer: Added global filtersafety (class=org.apache.hadoop.http.HttpServer$QuotingInputFilter)
10/09/13 23:04:59 INFO jobhistory.JobHistory: History log directory is file:////home/mr20/bin/../logs/history
10/09/13 23:04:59 INFO http.HttpServer: Port returned by webServer.getConnectors()[0].getLocalPort()
before open() is -1. Opening the listener on 32000
10/09/13 23:04:59 INFO http.HttpServer: listener.getLocalPort() returned 32000 webServer.getConnectors()[0].getLocalPort()
returned 32000
10/09/13 23:04:59 INFO http.HttpServer: Jetty bound to port 32000
10/09/13 23:04:59 INFO mortbay.log: jetty-6.1.14
10/09/13 23:05:04 INFO mortbay.log: Started SelectChannelConnector@hns4.sea1.qc:32000
10/09/13 23:05:04 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker,
sessionId=
10/09/13 23:05:04 INFO mapred.JobTracker: JobTracker up at: 31000
10/09/13 23:05:04 INFO mapred.JobTracker: JobTracker webserver: 32000
10/09/13 23:05:04 WARN conf.Configuration: mapred.task.id is deprecated. Instead, use mapreduce.task.attempt.id
10/09/13 23:05:04 WARN mapred.JobTracker: Failed to add the job jobtracker.info
java.lang.IllegalArgumentException: JobId string : jobtracker.info is not properly formed
	at org.apache.hadoop.mapreduce.JobID.forName(JobID.java:158)
	at org.apache.hadoop.mapred.JobID.forName(JobID.java:84)
	at org.apache.hadoop.mapred.JobTracker$RecoveryManager.addJobForRecovery(JobTracker.java:1057)
	at org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:1565)
	at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:275)
	at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:267)
	at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:262)
	at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:4256)
10/09/13 23:05:04 INFO jobhistory.JobHistory: Inited the done directory to file:/home/mr20/logs/history/done
10/09/13 23:05:04 INFO jobhistory.JobHistory: Job History Cleaner Thread started. MaxAge is
604800000 ms(7.0 days), Cleanup Frequency is 86400000 ms (1.0 days)
10/09/13 23:05:04 WARN conf.Configuration: topology.node.switch.mapping.impl is deprecated.
Instead, use net.topology.node.switch.mapping.impl
10/09/13 23:05:04 INFO mapred.CompletedJobStatusStore: Completed job store activated/configured
with retain-time : 3600000 , job-info-dir : /jobtracker/jobsInfo
10/09/13 23:05:05 INFO mapred.FairScheduler: Successfully configured FairScheduler
10/09/13 23:05:05 INFO mapred.JobTracker: Starting the recovery process for 1 jobs ...
10/09/13 23:05:05 INFO mapred.JobTracker: Submitting job job_201009090022_0001
10/09/13 23:05:05 WARN mapred.JobTracker: Could not recover job job_201009090022_0001
java.io.FileNotFoundException: File does not exist: hdfs://hns4.sea1.qc:21000/tmp/hadoop-mr20/mapred/staging/dadkins/.staging/job_201009090022_0001/job.xml
	at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:732)
	at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:231)
	at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:183)
	at org.apache.hadoop.fs.FileSystem.copyToLocalFile(FileSystem.java:1587)
	at org.apache.hadoop.fs.FileSystem.copyToLocalFile(FileSystem.java:1568)
	at org.apache.hadoop.mapred.JobInProgress.<init>(JobInProgress.java:426)
	at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:3048)
	at org.apache.hadoop.mapred.JobTracker.access$1200(JobTracker.java:125)
	at org.apache.hadoop.mapred.JobTracker$RecoveryManager.recover(JobTracker.java:1171)
	at org.apache.hadoop.mapred.JobTracker.offerService(JobTracker.java:1733)
	at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:4257)
10/09/13 23:05:05 INFO mapred.JobTracker: Recovery done! Recoverd 0 of 1 jobs.
10/09/13 23:05:05 INFO mapred.JobTracker: Recovery Duration (ms):73
10/09/13 23:05:05 INFO mapred.JobTracker: Refreshing hosts information
10/09/13 23:05:05 INFO util.HostsFileReader: Setting the includes file to 
10/09/13 23:05:05 INFO util.HostsFileReader: Setting the excludes file to 
10/09/13 23:05:05 INFO util.HostsFileReader: Refreshing hosts (include/exclude) list
10/09/13 23:05:05 INFO mapred.JobTracker: Decommissioning 0 nodes
10/09/13 23:05:05 WARN mapred.CompletedJobStatusStore: Could not obtain job info files : Filesystem
closed
java.io.IOException: Filesystem closed
	at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:307)
	at org.apache.hadoop.hdfs.DFSClient.listPaths(DFSClient.java:860)
	at org.apache.hadoop.hdfs.DFSClient.listPaths(DFSClient.java:845)
	at org.apache.hadoop.hdfs.DistributedFileSystem.listStatus(DistributedFileSystem.java:373)
	at org.apache.hadoop.mapred.CompletedJobStatusStore.deleteJobStatusDirs(CompletedJobStatusStore.java:143)
	at org.apache.hadoop.mapred.CompletedJobStatusStore.run(CompletedJobStatusStore.java:128)
	at java.lang.Thread.run(Thread.java:619)


10/09/13 23:05:04 INFO FSNamesystem.audit: ugi=mr20	ip=/10.2.12.100	cmd=listStatus	src=/tmp/hadoop-mr20/mapred/system
dst=null	perm=null
10/09/13 23:05:04 INFO FSNamesystem.audit: ugi=mr20	ip=/10.2.12.100	cmd=open	src=/tmp/hadoop-mr20/mapred/system/jobtracker.info
dst=null	perm=null
10/09/13 23:05:04 INFO namenode.FSNamesystem: Number of transactions: 64758 Total time for
transactions(ms): 565Number of transactions batched in Syncs: 7924 Number of syncs: 32035
SyncTimes(ms): 259783 
10/09/13 23:05:04 INFO FSNamesystem.audit: ugi=mr20	ip=/10.2.12.100	cmd=create	src=/tmp/hadoop-mr20/mapred/system/jobtracker.info.recover
dst=nullperm=mr20:supergroup:rw-r--r--
10/09/13 23:05:05 INFO FSNamesystem.audit: ugi=mr20	ip=/10.2.12.100	cmd=setPermission	src=/tmp/hadoop-mr20/mapred/system/jobtracker.info.recover
dst=null	perm=mr20:supergroup:rw-------
10/09/13 23:05:05 INFO hdfs.StateChange: BLOCK* NameSystem.allocateBlock: /tmp/hadoop-mr20/mapred/system/jobtracker.info.recover.
blk_2162037812829037837_13011{blockUCState=UNDER_CONSTRUCTION, primaryNodeIndex=-1, replicas=[ReplicaUnderConstruction[10.2.20.1:21100|RBW],
ReplicaUnderConstruction[10.2.19.7:21100|RBW], ReplicaUnderConstruction[10.2.20.3:21100|RBW]]}
10/09/13 23:05:05 INFO hdfs.StateChange: BLOCK* NameSystem.addStoredBlock: blockMap updated:
10.2.20.3:21100 is added to blk_2162037812829037837_13011{blockUCState=UNDER_CONSTRUCTION,
primaryNodeIndex=-1, replicas=[ReplicaUnderConstruction[10.2.20.1:21100|RBW], ReplicaUnderConstruction[10.2.19.7:21100|RBW],
ReplicaUnderConstruction[10.2.20.3:21100|RBW]]} size 0
10/09/13 23:05:05 INFO hdfs.StateChange: BLOCK* NameSystem.addStoredBlock: blockMap updated:
10.2.19.7:21100 is added to blk_2162037812829037837_13011{blockUCState=UNDER_CONSTRUCTION,
primaryNodeIndex=-1, replicas=[ReplicaUnderConstruction[10.2.20.1:21100|RBW], ReplicaUnderConstruction[10.2.19.7:21100|RBW],
ReplicaUnderConstruction[10.2.20.3:21100|RBW]]} size 0
10/09/13 23:05:05 INFO hdfs.StateChange: BLOCK* NameSystem.addStoredBlock: blockMap updated:
10.2.20.1:21100 is added to blk_2162037812829037837_13011{blockUCState=UNDER_CONSTRUCTION,
primaryNodeIndex=-1, replicas=[ReplicaUnderConstruction[10.2.20.1:21100|RBW], ReplicaUnderConstruction[10.2.19.7:21100|RBW],
ReplicaUnderConstruction[10.2.20.3:21100|RBW]]} size 0
10/09/13 23:05:05 INFO hdfs.StateChange: DIR* NameSystem.completeFile: file /tmp/hadoop-mr20/mapred/system/jobtracker.info.recover
is closed by DFSClient_544581191
10/09/13 23:05:05 INFO hdfs.StateChange: BLOCK* NameSystem.addToInvalidates: blk_-651419604412711033_11114
to 10.2.19.102:21100 10.2.19.4:21100 10.2.20.102:21100 
10/09/13 23:05:05 INFO FSNamesystem.audit: ugi=mr20	ip=/10.2.12.100	cmd=delete	src=/tmp/hadoop-mr20/mapred/system/jobtracker.info
dst=null	perm=null
10/09/13 23:05:05 INFO FSNamesystem.audit: ugi=mr20	ip=/10.2.12.100	cmd=rename	src=/tmp/hadoop-mr20/mapred/system/jobtracker.info.recover
dst=/tmp/hadoop-mr20/mapred/system/jobtracker.info	perm=mr20:supergroup:rw-------
10/09/13 23:05:05 INFO FSNamesystem.audit: ugi=mr20	ip=/10.2.12.100	cmd=open	src=/tmp/hadoop-mr20/mapred/system/job_201009090022_0001/job-info
dst=null	perm=null
10/09/13 23:05:06 INFO hdfs.StateChange: BLOCK* ask 10.2.20.102:21100 to delete  blk_-651419604412711033_11114
10/09/13 23:05:06 INFO hdfs.StateChange: BLOCK* ask 10.2.19.102:21100 to delete  blk_-651419604412711033_11114
10/09/13 23:05:06 INFO hdfs.StateChange: BLOCK* ask 10.2.19.4:21100 to delete  blk_-651419604412711033_11114


> IOException: Filesystem closed on submitJob
> -------------------------------------------
>
>                 Key: MAPREDUCE-2060
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2060
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.22.0
>         Environment: https://svn.apache.org/repos/asf/hadoop/mapreduce/trunk@994941
> https://svn.apache.org/repos/asf/hadoop/hdfs/trunk@993542
>            Reporter: Dan Adkins
>
> I get the following strange error on the jobtracker when attempting to submit a job:
> 10/09/09 20:31:35 INFO ipc.Server: IPC Server handler 7 on 31000, call submitJob(job_201009092028_0001,
hdfs://hns4.sea1.qc:21000/tmp/hadoop-mr20/mapred/staging/dadkins/.staging/job_201009092028_0001,
org.apache.hadoop.security.Credentials@20c87621) from 10.128.130.145:49253: error: java.io.IOException:
Filesystem closed
> java.io.IOException: Filesystem closed
> 	at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:307)
> 	at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:1212)
> 	at org.apache.hadoop.hdfs.DistributedFileSystem.mkdirs(DistributedFileSystem.java:494)
> 	at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:1491)
> 	at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:395)
> 	at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:3078)
> 	at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:3014)
> 	at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:2996)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at org.apache.hadoop.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:349)
> 	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1380)
> 	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1376)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:396)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1105)
> 	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1374)

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