Anu Engineer created HDFS-8883:
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Summary: NameNode Metrics : Add FSNameSystem lock Queue Length
Key: HDFS-8883
URL: https://issues.apache.org/jira/browse/HDFS-8883
Project: Hadoop HDFS
Issue Type: Improvement
Components: HDFS
Affects Versions: 2.7.1
Reporter: Anu Engineer
Assignee: Anu Engineer
Priority: Minor
Fix For: 2.8.0
FSNameSystemLock can have contention when NameNode is under load. This patch
adds LockQueueLength -- the number of threads waiting on FSNameSystemLock --
as a metric in NameNode.
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