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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-385) Design a pluggable interface to place replicas of blocks in HDFS
Date Wed, 05 Sep 2012 23:53:10 GMT

     [ https://issues.apache.org/jira/browse/HDFS-385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Suresh Srinivas updated HDFS-385:
---------------------------------

    Fix Version/s: 1-win
                   1.2.0
    
> Design a pluggable interface to place replicas of blocks in HDFS
> ----------------------------------------------------------------
>
>                 Key: HDFS-385
>                 URL: https://issues.apache.org/jira/browse/HDFS-385
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.21.0, 1.2.0, 1-win
>
>         Attachments: BlockPlacementPluggable2.txt, BlockPlacementPluggable3.txt, BlockPlacementPluggable4.txt,
BlockPlacementPluggable4.txt, BlockPlacementPluggable5.txt, BlockPlacementPluggable6.txt,
BlockPlacementPluggable7.txt, BlockPlacementPluggable.txt, blockplacementpolicy2-branch-1.patch,
blockplacementpolicy2-branch-1-win.patch, blockplacementpolicy3-branch-1.patch, blockplacementpolicy3-branch-1-win.patch,
blockplacementpolicy-branch-1.patch, blockplacementpolicy-branch-1-win.patch, rat094.txt
>
>
> The current HDFS code typically places one replica on local rack, the second replica
on remote random rack and the third replica on a random node of that remote rack. This algorithm
is baked in the NameNode's code. It would be nice to make the block placement algorithm a
pluggable interface. This will allow experimentation of different placement algorithms based
on workloads, availability guarantees and failure models.

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