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https://issues.apache.org/jira/browse/MAPREDUCE-2459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mac Yang updated MAPREDUCE-2459:
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Status: Open (was: Patch Available)
> Cache HAR filesystem metadata
> -----------------------------
>
> Key: MAPREDUCE-2459
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2459
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: harchive
> Reporter: Mac Yang
> Assignee: Mac Yang
> Fix For: 0.23.0
>
> Attachments: MAPREDUCE-2459.1.patch, MAPREDUCE-2459.2.patch
>
>
> Each HAR file system has two index files that contains information on how
> files are stored in the part files. During the block location calculation,
> these indexes are reread for every file in the archive. Caching the indexes
> and the status of the part files will greatly reduce the number of name node
> operations during the job setup time.
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