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https://issues.apache.org/jira/browse/MAPREDUCE-2267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-2267.
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Resolution: Won't Fix
MR RAID has been replaced by HDFS EC in modern versions of Hadoop.
> 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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