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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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Kihwal Lee updated HDFS-10987:
------------------------------
    Fix Version/s: 3.0.0-alpha2

> 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
>            Priority: Critical
>             Fix For: 3.0.0-alpha2
>
>         Attachments: HDFS-10987-002.patch, 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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