[jira] Commented: (HADOOP-3799) Design a pluggable interface to place replicas of blocks in HDFS

["Hong Tang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705258#action_12705258 ] 

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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