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https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14497437#comment-14497437
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Walter Su commented on HDFS-7891:
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bq. We want local rack in the T racks group.
Sorry, I need to correct myself. Actually it doesn't matter in normal case
because of pipeline. It might be useful in specific like EC because every
replica is an individual block. I still need to override chooseTargetInOrder()
for 2nd reason.
> A block placement policy with best rack failure tolerance
> ---------------------------------------------------------
>
> Key: HDFS-7891
> URL: https://issues.apache.org/jira/browse/HDFS-7891
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: namenode
> Reporter: Walter Su
> Assignee: Walter Su
> Priority: Minor
> Attachments: HDFS-7891.005.dup.patch, HDFS-7891.005.patch
>
>
> a block placement policy tries its best to place replicas to most racks.
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