[
https://issues.apache.org/jira/browse/HDFS-5693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13979708#comment-13979708
]
Hudson commented on HDFS-5693:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #1767 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1767/])
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)
