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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8883) NameNode Metrics : Add FSNameSystem lock Queue Length
Date Tue, 18 Aug 2015 16:43:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14701555#comment-14701555
] 

Hudson commented on HDFS-8883:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #2218 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/2218/])
HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer.
(xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
* hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
* 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/metrics/FSNamesystemMBean.java


> 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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