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https://issues.apache.org/jira/browse/HDFS-12049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang resolved HDFS-12049.
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Resolution: Duplicate
> 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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