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https://issues.apache.org/jira/browse/HDFS-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204098#comment-13204098
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Tsz Wo (Nicholas), SZE commented on HDFS-1120:
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Similar to BlockPlacementPolicy, BlockVolumeChoosingPolicy actually is better
annotated as @InterfaceAudience.Private. Harsh, how does it sound to you?
> 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
> Assignee: Harsh J
> Fix For: 0.23.0
>
> Attachments: HDFS-1120.r1.diff, HDFS-1120.r2.diff, HDFS-1120.r3.diff,
> HDFS-1120.r4.diff
>
>
> 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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