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https://issues.apache.org/jira/browse/MAPREDUCE-2459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032524#comment-13032524
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Mahadev konar commented on MAPREDUCE-2459:
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Mac, looks like the tests are failing (especially TestHarFileSystem). The patch
looks good to me. Is there any particular reason on using an _ in front of the
following variables?
{noformat}
_harMetaCache
{noformat}
Also, this is meant for trunk only?
> 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
>
>
> 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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