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From "Mac Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2459) Cache HAR filesystem metadata
Date Fri, 13 May 2011 20:45:49 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mac Yang updated MAPREDUCE-2459:
--------------------------------

    Status: Patch Available  (was: Open)

> 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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