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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1234) map tasks fail because they do not find application in file cache
Date Thu, 19 Apr 2007 21:56:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490182
] 

Owen O'Malley commented on HADOOP-1234:
---------------------------------------

I think I see the problem. I'll check more on it tomorrow.

> map tasks fail because they do not find application in file cache
> -----------------------------------------------------------------
>
>                 Key: HADOOP-1234
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1234
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.12.1
>            Reporter: Christian Kunz
>         Assigned To: Owen O'Malley
>
> Using C++ map-reduce interface, a lot of tasks fail because they do not find the application
in the file cache.
> Might be a race condition between multiple tasks on the same node.
> java.io.IOException: Cannot run program "<path>/mapred/local/taskTracker/archive/<namenodehost>/<path>/<application>":
java.io.IOException: error=2, No such file or directory
> 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:459)
> 	at org.apache.hadoop.mapred.pipes.Application.runClient(Application.java:131)
> 	at org.apache.hadoop.mapred.pipes.Application.(Application.java:59)
> 	at org.apache.hadoop.mapred.pipes.PipesMapRunner.run(PipesMapRunner.java:44)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:176)
> 	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1459)
> Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
> 	at java.lang.UNIXProcess.(UNIXProcess.java:148)
> 	at java.lang.ProcessImpl.start(ProcessImpl.java:65)
> 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:452)
> 	... 5 more

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