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https://issues.apache.org/jira/browse/HDFS-10987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brahma Reddy Battula updated HDFS-10987:
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Status: Patch Available (was: Open)
> Make Decommission less expensive when lot of blocks present.
> ------------------------------------------------------------
>
> Key: HDFS-10987
> URL: https://issues.apache.org/jira/browse/HDFS-10987
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brahma Reddy Battula
> Assignee: Brahma Reddy Battula
> Attachments: HDFS-10987.patch
>
>
> When user want to decommission a node which having 50M blocks +,it could hold
> the namesystem lock for long time.We've seen it is taking 36 sec+.
> As we knew during this time, Namenode will not available... As this
> decommission will continuosly run till all the blocks got replicated,hence
> Namenode will unavailable.
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