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https://issues.apache.org/jira/browse/HADOOP-2228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12552096
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Devaraj Das commented on HADOOP-2228:
-------------------------------------
Sorry Johan, I had missed that part of JobClient that creates a proxy. That
proxy has the retry mechanism and hence you might run into the situation you
described.
> Jobs fail because job.xml exists
> --------------------------------
>
> Key: HADOOP-2228
> URL: https://issues.apache.org/jira/browse/HADOOP-2228
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.14.3
> Environment: 35 node cluster, linux
> Reporter: Johan Oskarsson
> Assignee: Johan Oskarsson
> Fix For: 0.16.0
>
> Attachments: HADOOP-2228-v1.patch
>
>
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: Target
> /var/storage/4/mapred/local/jobTracker/job_200711081903_3976.xml already
> exists
> at org.apache.hadoop.fs.FileUtil.checkDest(FileUtil.java:271)
> at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:117)
> at
> org.apache.hadoop.fs.FileSystem.copyToLocalFile(FileSystem.java:803)
> at
> org.apache.hadoop.fs.FileSystem.copyToLocalFile(FileSystem.java:784)
> at
> org.apache.hadoop.mapred.JobInProgress.<init>(JobInProgress.java:134)
> at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:1479)
> at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:340)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:566)
> at org.apache.hadoop.ipc.Client.call(Client.java:470)
> at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:165)
> at $Proxy1.submitJob(Unknown Source)
> at sun.reflect.GeneratedMethodAccessor26.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
> at $Proxy1.submitJob(Unknown Source)
> at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:397)
> at org.apache.hadoop.mapred.jobcontrol.Job.submit(Job.java:345)
> at
> org.apache.hadoop.mapred.jobcontrol.JobControl.startReadyJobs(JobControl.java:250)
> at
> org.apache.hadoop.mapred.jobcontrol.JobControl.run(JobControl.java:282)
> at java.lang.Thread.run(Thread.java:619)
> Perhaps related to HADOOP-1057, HADOOP-891 or to the rpc retry. It seems my
> job was submitted and actually finished despite the exception. Could it be
> that the job went in and the rpc retry decided to submit it again anyway?
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