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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