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Posted to mapreduce-issues@hadoop.apache.org by "Mahadev konar (JIRA)" <ji...@apache.org> on 2011/05/12 19:25:47 UTC

[jira] [Updated] (MAPREDUCE-2459) Cache HAR filesystem metadata

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

Mahadev konar updated MAPREDUCE-2459:
-------------------------------------

    Affects Version/s: 0.23.0

> 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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