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Anu Engineer commented on HDFS-8883: ------------------------------------ None of the test failures seem to be related to this patch. Re-running them on my local machine does succeed. > 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 > > Attachments: HDFS-8883.001.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)