[jira] Updated: (HADOOP-2803) Race condition in DistributedCache

["Nigel Daley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nigel Daley updated HADOOP-2803:
--------------------------------

    Fix Version/s: 0.17.0
         Assignee: Mahadev konar

need to investigate

> Race condition in DistributedCache
> ----------------------------------
>
>                 Key: HADOOP-2803
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2803
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.16.0
>            Reporter: Christian Kunz
>            Assignee: Mahadev konar
>             Fix For: 0.17.0
>
>
> When an older version of a file in DistributedCache exists locally and multiple tasks per node start, they can run into a race condition:
> dir/mapred/local/taskTracker/archive/subdir/filename is in use and cannot be refreshed
> 	at org.apache.hadoop.filecache.DistributedCache.localizeCache(DistributedCache.java:313)
> 	at org.apache.hadoop.filecache.DistributedCache.getLocalCache(DistributedCache.java:161)
> 	at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:134)
> We ran a job with the wrong file, then around 50 minutes later we put the fixed version into DFS, and ran the same job again. The job had 11,000 maps ~ about 4-5 waves of map tasks and produced 3,500 failed tasks with above error. We eventually killed it and restarted the same job again, with no problems this time.

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