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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2267) Parallelize reading of blocks within a stripe
Date Fri, 04 Feb 2011 02:07:22 GMT

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

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

    Status: Open  (was: Patch Available)

Will upload another 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-2267.1.patch, MAPREDUCE-2267.2.patch, MAPREDUCE-2267.3.patch,
MAPREDUCE-2267.4.patch, 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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