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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