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https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14495937#comment-14495937
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Walter Su commented on HDFS-7891:
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005 patch is ready for review.
NOTE. *005 patch doesn't include any delete policy*. The delete policy from
default policy deletes replica from rack which have more than one replica
first. Even through it maybe prefer deleting from A(has 2 replicas) to deleting
from B(has 3 replicas). But it always prefer deleting from A(has 2 replicas) to
deleting from C(has 1 replica). So it's still best rack failure tolerance.
> 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.patch
>
>
> a block placement policy tries its best to place replicas to most racks.
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