Hudson commented on HDFS-10987:

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10606 (See 
HDFS-10987. Make Decommission less expensive when lot of blocks present. 
(kihwal: rev 332a61fd74fd2a9874319232c583ab5d2c53ff03)
* (edit) 

> 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
>         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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