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https://issues.apache.org/jira/browse/HDFS-7735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14305122#comment-14305122
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Kihwal Lee commented on HDFS-7735:
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HDFS-7411 is related. Please have a look.
> Optimize decommission Datanodes to reduce the impact on NameNode's performance
> ------------------------------------------------------------------------------
>
> Key: HDFS-7735
> URL: https://issues.apache.org/jira/browse/HDFS-7735
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: zhaoyunjiong
> Assignee: zhaoyunjiong
> Attachments: HDFS-7735.patch
>
>
> When decommission DataNodes, by default, DecommissionManager will check
> progress every 30 seconds, and it will hold writeLock of Namesystem. It
> significantly impact NameNode's performance.
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