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https://issues.apache.org/jira/browse/HDFS-10564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15367308#comment-15367308
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Yuanbo Liu commented on HDFS-10564:
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[~eclark] Actually blocks which need to be replicated have redundancy priority,
you can find more details from {{LowRedundancyBlocks#getPriorityContiguous}}.
Only replication <= 1 in some cases will be considered as highest priority.
> 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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