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https://issues.apache.org/jira/browse/MAPREDUCE-4705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471806#comment-13471806
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Jason Lowe commented on MAPREDUCE-4705:
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The problem occurs because HistoryFileManager.scanOldDirsForJob is using a
job's serial number directly to lookup the serial number index (which would
require an entry in the map per job) rather than the result of
JobHistoryUtils.serialNumberDirectoryComponent which carves off the lower
digits of the serial number, effectively grouping them into buckets of 1000.
I'll post a patch shortly.
> Historyserver links expire before the history data does
> -------------------------------------------------------
>
> Key: MAPREDUCE-4705
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4705
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobhistoryserver, mrv2
> Affects Versions: 0.23.3
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Critical
>
> The historyserver can serve up links to jobs that become useless well before
> the job history files are purged. For example on a large, heavily used
> cluster we can end up rotating through the maximum number of jobs the
> historyserver can track fairly quickly. If a user was investigating an issue
> with a job using a saved historyserver URL, that URL can become useless
> because the historyserver has forgotten about the job even though the history
> files are still sitting in HDFS.
> We can tell the historyserver to keep track of more jobs by increasing
> {{mapreduce.jobhistory.joblist.cache.size}}, but this has a direct impact on
> the responsiveness of the main historyserver page since it serves up all the
> entries to the client at once. It looks like Hadoop 1.x avoided this issue
> by encoding the history file location into the URLs served up by the
> historyserver, so it didn't have to track a mapping between job ID and
> history file location.
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