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https://issues.apache.org/jira/browse/HDFS-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862675#action_12862675
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dhruba borthakur commented on HDFS-1120:
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do you have a use-case in mind when such a policy if beneficial and why the
current policy is inadequate?
is a policy that tries to keep all disks at the same usage capacity better
then the round-robin one? especially when disks can die, get repaired and then
put back into the same system?
> Make DataNode's block-to-device placement policy pluggable
> ----------------------------------------------------------
>
> Key: HDFS-1120
> URL: https://issues.apache.org/jira/browse/HDFS-1120
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: Jeff Hammerbacher
>
> As discussed on the mailing list, as the number of disk drives per server
> increases, it would be useful to allow the DataNode's policy for new block
> placement to grow in sophistication from the current round-robin strategy.
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