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https://issues.apache.org/jira/browse/HDFS-10564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15373663#comment-15373663
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Elliott Clark commented on HDFS-10564:
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It doesn't seem to be working. We have multiple times per day where the number
of under min repl'd blocks stays for hours.
> UNDER MIN REPL'D BLOCKS should be prioritized for replication
> -------------------------------------------------------------
>
> Key: HDFS-10564
> URL: https://issues.apache.org/jira/browse/HDFS-10564
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Elliott Clark
>
> When datanodes get drained they are probably being drained because the
> hardware is bad, or suspect. The blocks that have no live nodes should be
> prioritized. However it appears not to be the case at all.
> Draining full nodes with lots of blocks but only a handful of under min
> replicated blocks takes about the full time before fsck reports clean again.
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