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https://issues.apache.org/jira/browse/HDFS-8883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14701385#comment-14701385
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Hudson commented on HDFS-8883:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #288 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/288/])
HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed
by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
* hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
> 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
> 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.
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