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