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Posted to mapreduce-issues@hadoop.apache.org by "Ramkumar Vadali (JIRA)" <ji...@apache.org> on 2011/01/15 02:31:46 UTC

[jira] Updated: (MAPREDUCE-2267) Parallelize reading of blocks within a stripe

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ramkumar Vadali updated MAPREDUCE-2267:
---------------------------------------

    Attachment: MAPREDUCE-2267.patch

> Parallelize reading of blocks within a stripe
> ---------------------------------------------
>
>                 Key: MAPREDUCE-2267
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2267
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/raid
>    Affects Versions: 0.22.0
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>         Attachments: MAPREDUCE-2267.patch
>
>
> RAID code has several instances where several blocks of data have to be read to perform an operation. For example, computing a parity block requires reading the blocks of the source file. Similarly, generating a fixed block requires reading a parity block and the good blocks from the source file. These read operations proceed sequentially currently. RAID code should use a thread pool to increase the parallelism and thus reduce latency.

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