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Posted to mapreduce-dev@hadoop.apache.org by "Ramkumar Vadali (JIRA)" <ji...@apache.org> on 2011/01/15 02:31:45 UTC

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

Parallelize reading of blocks within a stripe
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                 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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