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https://issues.apache.org/jira/browse/HDFS-12049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16353288#comment-16353288
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Wangda Tan commented on HDFS-12049:
-----------------------------------
We plan to start merge vote of 3.1.0 on Feb 18, please let me know if any plan
to finish this by Feb 18 or we need to move it to 3.2.0.
> Recommissioning live nodes stalls the NN
> ----------------------------------------
>
> Key: HDFS-12049
> URL: https://issues.apache.org/jira/browse/HDFS-12049
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Daryn Sharp
> Priority: Critical
>
> A node refresh will recommission included nodes that are alive and in
> decommissioning or decommissioned state. The recommission will scan all
> blocks on the node, find over replicated blocks, chose an excess, queue an
> invalidate.
> The process is expensive and worsened by overhead of storage types (even when
> not in use). It can be especially devastating because the write lock is held
> for the entire node refresh. _Recommissioning 67 nodes with ~500k
> blocks/node stalled rpc services for over 4 mins._
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