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https://issues.apache.org/jira/browse/HDFS-12049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608706#comment-16608706
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Sunil Govindan commented on HDFS-12049:
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Hi [~daryn], Could u please help to check on this issue. As there is no
progress and code freeze for 3.2.0 is nearing, we can move to 3.3.0 if there
are no immediate plans.
> 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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