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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3799) Design a pluggable interface to place replicas of blocks in HDFS
Date Sat, 02 May 2009 11:19:30 GMT

    [ 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:
-----------------------------------

@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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