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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1831) BlockPlacement policy for RAID
Date Fri, 10 Dec 2010 18:35:05 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Chen updated MAPREDUCE-1831:
----------------------------------

    Attachment: test.result

Attached the ant test result. There is one error.
{code}
    [junit] Running org.apache.hadoop.mapred.TestControlledMapReduceJob
    [junit] Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 0 sec
{code}

> BlockPlacement policy for RAID
> ------------------------------
>
>                 Key: MAPREDUCE-1831
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1831
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/raid
>    Affects Versions: 0.23.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-1831-v2.txt, MAPREDUCE-1831.20100610.txt, MAPREDUCE-1831.txt,
MAPREDUCE-1831.v1.1.txt, test.result
>
>
> Raid introduce the new dependency between blocks within a file.
> The blocks help decode each other. Therefore we should avoid put them on the same machine.
> The proposed BlockPlacementPolicy does the following
> 1. When writing parity blocks, it avoid the parity blocks and source blocks sit together.
> 2. When reducing replication number, it deletes the blocks that sits with other dependent
blocks.
> 3. It does not change the way we write normal files. It only has different behavior when
processing raid files.

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