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https://issues.apache.org/jira/browse/HDFS-8543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14578160#comment-14578160
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Walter Su commented on HDFS-8543:
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The problem of the old code: Assume blockGroup=\[0, 1, 2, 3\]. We lose idx=2,
and are left \[0, 1, 3\]. After recovery, we get\[0, 1, 2, 3\]. Assume dead DN
comes back. We have\[0, 1, 2, 3, 2\]. The old processOverReplicatedBlock() may
delete idx=1, so we are left \[0, 2, 3, 2\], we have to recover it again. It
could be an endless loop.
> Erasure Coding: processOverReplicatedBlock() handles striped block
> ------------------------------------------------------------------
>
> Key: HDFS-8543
> URL: https://issues.apache.org/jira/browse/HDFS-8543
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Walter Su
> Assignee: Walter Su
> Attachments: HDFS-8543-HDFS-7285.01.patch
>
>
> striped block group could be over replicated when: 1.dead DN comes back. 2.
> Balancer/Mover copies block before deletes it.
> This jira add logic for processOverReplicatedBlock() handling striped block
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