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https://issues.apache.org/jira/browse/MAPREDUCE-6252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14516596#comment-14516596
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Hudson commented on MAPREDUCE-6252:
-----------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #7692 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/7692/])
Moving MAPREDUCE-6252 to the 2.7.1 CHANGES.txt (devaraj: rev
99fe03e439b0f9afd01754d998c6eb64f0f70300)
* hadoop-mapreduce-project/CHANGES.txt
> JobHistoryServer should not fail when encountering a missing directory
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-6252
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6252
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobhistoryserver
> Affects Versions: 2.6.0
> Reporter: Craig Welch
> Assignee: Craig Welch
> Fix For: 2.8.0, 2.7.1
>
> Attachments: MAPREDUCE-6252.0.patch, MAPREDUCE-6252.1.patch
>
>
> The JobHistoryServer maintains a cache of job serial number parts to dfs
> paths which it uses when seeking a job it no longer has in its memory cache,
> multiple directories for a given serial number differentiated by time stamp.
> At present the jobhistory server will fail any time it attempts to find a job
> in a directory which no longer exists based on that cache - even though the
> job may well exist in a different directory for the serial number. Typically
> this is not an issue, but the history cleanup process removes the directory
> from dfs before removing it from the cache which leaves a window of time
> where a directory may be missing from dfs which is present in the cache,
> resulting in failure. For some dfs's it appears that the top level directory
> may become unavailable some time before the full deletion of the tree
> completes which extends what might otherwise be a brief period of failure to
> a more extended period. Further, this also places the service at the mercy
> of outside processes which might remove those directories. The proposal is
> simply to make the server resistant to this state such that encountering this
> missing directory is not fatal and the process will continue on to seek it
> elsewhere.
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