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From "Jingkei Ly (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3799) Design a pluggable interface to place replicas of blocks in HDFS
Date Mon, 11 May 2009 13:45:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12708030#action_12708030
] 

Jingkei Ly commented on HADOOP-3799:
------------------------------------

Hi Dhruba. I'm really glad you raised this JIRA because I need something like this in-order
to be able to co-locate blocks based on the filename of the file the blocks belong to - I
think similar to what you mentioned you would like to do. However,  I'm not sure how you would
do this with the interface you are proposing, as BlockPlacementInterface#chooseTarget() isn't
passed anything to identify the block or filename that is being written - am I missing something?
How would this be done?

> 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
>
>
> 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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