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https://issues.apache.org/jira/browse/MAPREDUCE-323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874651#action_12874651
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Dick King commented on MAPREDUCE-323:
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The user and jobID index can both be obtained from arguments to calls to the
API {{JobHistory.getJobHistoryFile(...)}} . The time stamp cannot.
I'll have to store maps from jobID indices to time of first
{{JobHistory.getJobHistoryFile(...)}} call to support the functionality if the
cluster owner specifies time-stamp based directory structure. This map lives
in the job tracker and creates a practical limit of perhaps a half million
jobs, if this feature is used. Does this seem reasonable?
> Improve the way job history files are managed
> ---------------------------------------------
>
> Key: MAPREDUCE-323
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-323
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Amar Kamat
> Assignee: Dick King
> Priority: Critical
>
> Today all the jobhistory files are dumped in one _job-history_ folder. This
> can cause problems when there is a need to search the history folder
> (job-recovery etc). It would be nice if we group all the jobs under a _user_
> folder. So all the jobs for user _amar_ will go in _history-folder/amar/_.
> Jobs can be categorized using various features like _jobid, date, jobname_
> etc but using _username_ will make the search much more efficient and also
> will not result into namespace explosion.
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