Kihwal Lee updated HDFS-10987:
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 2.8.0
           Status: Resolved  (was: Patch Available)

Thanks everyone for reviews and thanks for working on this [~brahmareddy]. 
Committed this to trunk, branch-2 and branch-2.8. branch-2* had a couple of 
minor conflicts that was easily resolved.

> 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: 2.8.0, 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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