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https://issues.apache.org/jira/browse/HADOOP-3799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705258#action_12705258
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Hong Tang commented on HADOOP-3799:
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@dhruba
any specific block replication policies you might be interested in
experimenting with?
additionally, Ben Reed pointed me to this paper in NSDI 09 where the authors
described a scheme on how to allow applications to express storage cues (some
of them can be replication policies):
Flexible, Wide-Area Storage for Distributed Systems with WheelFS
Jeremy Stribling, MIT CSAIL; Yair Sovran, New York University; Irene Zhang and
Xavid Pretzer, MIT CSAIL; Jinyang Li, New York University; M. Frans Kaashoek
and Robert Morris, MIT CSAIL
http://www.usenix.org/events/nsdi09/tech/full_papers/stribling/stribling.pdf
> 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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