Brahma Reddy Battula created HDFS-10987:
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Summary: 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
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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