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From "zhaoyunjiong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7735) Optimize decommission Datanodes to reduce the impact on NameNode's performance
Date Wed, 04 Feb 2015 08:53:34 GMT
zhaoyunjiong created HDFS-7735:
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             Summary: Optimize decommission Datanodes to reduce the impact on NameNode's performance
                 Key: HDFS-7735
                 URL: https://issues.apache.org/jira/browse/HDFS-7735
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
            Reporter: zhaoyunjiong
            Assignee: zhaoyunjiong


When decommission DataNodes, by default, DecommissionManager will check progress every 30
seconds, and it will hold writeLock of Namesystem. It significantly impact NameNode's performance.



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