[ https://issues.apache.org/jira/browse/HDFS-5693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13981003#comment-13981003 ]
Hudson commented on HDFS-5693: ------------------------------ FAILURE: Integrated in Hadoop-Hdfs-trunk #1742 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1742/]) HDFS-5693. Few NN metrics data points were collected via JMX when NN is under heavy load. Contributed by Ming Ma. (jing9: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1589620) * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystemMBean.java > Few NN metrics data points were collected via JMX when NN is under heavy load > ----------------------------------------------------------------------------- > > Key: HDFS-5693 > URL: https://issues.apache.org/jira/browse/HDFS-5693 > Project: Hadoop HDFS > Issue Type: Improvement > Components: namenode > Reporter: Ming Ma > Assignee: Ming Ma > Fix For: 2.5.0 > > Attachments: HADOOP-5693.patch, HDFS-5693-2.patch, HDFS-5693.patch > > > JMX sometimes doesn’t return any value when NN is under heavy load. However, > that is when we would like to get metrics to help to diagnosis the issue. > When NN is under heavy load due to bad application or other reasons, it holds > FSNamesystem's writer lock for a long period of time. Many of the > FSNamesystem metrics require FSNamesystem's reader lock and thus can't be > processed. > This is a special case to improve the overall NN concurrency. -- This message was sent by Atlassian JIRA (v6.2#6252)