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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3799) Design a pluggable interface to place replicas of blocks in HDFS
Date Sun, 31 May 2009 09:52:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-3799:
-------------------------------------

    Attachment: BlockPlacementPluggable2.txt

I incorporated all of Tom's comments. Thanks Tom.

This patch ensures that the following code paths conform to the configured block placement
policy:
1. Allocation of a new block for a file
2. deletion of excess replicas of a block
3. creation of new replicas of a block
4. movement of blocks triggered by the balancer
5. verification of block placement by fsck



> Design a pluggable interface to place replicas of blocks in HDFS
> ----------------------------------------------------------------
>
>                 Key: HADOOP-3799
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3799
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: BlockPlacementPluggable.txt, BlockPlacementPluggable2.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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