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https://issues.apache.org/jira/browse/HADOOP-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Chansler updated HADOOP-2803:
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Fix Version/s: (was: 0.17.0)
> 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
>
> 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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