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Posted to mapreduce-issues@hadoop.apache.org by "Harsh J (Resolved) (JIRA)" <ji...@apache.org> on 2011/12/31 10:40:30 UTC
[jira] [Resolved] (MAPREDUCE-57) The JobConf instance passed to
JobClient is unnecessarily modified
[ https://issues.apache.org/jira/browse/MAPREDUCE-57?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Harsh J resolved MAPREDUCE-57.
------------------------------
Resolution: Not A Problem
This isn't an issue anymore.
And submit job being called twice is not proper use. We check early today though.
> The JobConf instance passed to JobClient is unnecessarily modified
> ------------------------------------------------------------------
>
> Key: MAPREDUCE-57
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-57
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Nigel Daley
> Assignee: Owen O'Malley
>
> The JobConf instance passed to the JobClient.submitJob method is modified by that method. This side effect is surprising. IMHO, the passed in JobConf should either be defensively copied or the side effect should be documented.
> Trying to reuse a JobConf instance in multiple calls to JobClient.submitJob causes the following exception:
> java.io.IOException: /dfstmp/mapred/system/submit_r7mxti/job.jar: No such file or directory
> at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:80)
> at org.apache.hadoop.dfs.DistributedFileSystem.copyFromLocalFile(DistributedFileSystem.java:188)
> at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:291)
> at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:368)
> at org.apache.hadoop.examples.NNBench.main(NNBench.java:274)
> 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:585)
> at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
> at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:143)
> at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:41)
> 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:585)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:149)
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