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Posted to common-dev@hadoop.apache.org by "Robert Chansler (JIRA)" <ji...@apache.org> on 2008/03/25 04:03:27 UTC
[jira] Updated: (HADOOP-2803) Race condition in DistributedCache
[ https://issues.apache.org/jira/browse/HADOOP-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Chansler updated HADOOP-2803:
------------------------------------
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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