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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3990) NN's health report has severe performance problems
Date Fri, 09 Nov 2012 13:02:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493985#comment-13493985
] 

Hudson commented on HDFS-3990:
------------------------------

Integrated in Hadoop-Hdfs-trunk #1221 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1221/])
    HDFS-3990.  NN's health report has severe performance problems (daryn) (Revision 1407333)

     Result = SUCCESS
daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1407333
Files : 
* /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/protocol/DatanodeID.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/test/java/org/apache/hadoop/hdfs/TestDatanodeRegistration.java

                
> NN's health report has severe performance problems
> --------------------------------------------------
>
>                 Key: HDFS-3990
>                 URL: https://issues.apache.org/jira/browse/HDFS-3990
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>             Fix For: 3.0.0, 2.0.3-alpha, 0.23.5
>
>         Attachments: HDFS-3990.branch-0.23.patch, HDFS-3990.branch-0.23.patch, HDFS-3990.patch,
HDFS-3990.patch, HDFS-3990.patch, HDFS-3990.patch, HDFS-3990.patch, HDFS-3990.patch, HDFS-3990.patch,
HDFS-3990.patch, hdfs-3990.txt, hdfs-3990.txt
>
>
> The dfshealth page will place a read lock on the namespace while it does a dns lookup
for every DN.  On a multi-thousand node cluster, this often results in 10s+ load time for
the health page.  10 concurrent requests were found to cause 7m+ load times during which time
write operations blocked.

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