Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: hdfs-issues@hadoop.apache.org
Date: Tue, 16 Jul 2013 14:22:56 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12657703.1373885529705.58087.1373984576926@arcas>
In-Reply-To: <JIRA.12657703.1373885529705@arcas>
References: <JIRA.12657703.1373885529705@arcas>
Subject: [jira] [Commented] (HDFS-4992) Make balancer's thread count
 configurable
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/HDFS-4992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709803#comment-13709803 ] 

Hudson commented on HDFS-4992:
------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #4089 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/4089/])
HDFS-4992. Make balancer's mover thread count and dispatcher thread count configurable.  Contributed by Max Lapan (szetszwo: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1503720)
* /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/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java

                
> Make balancer's thread count configurable
> -----------------------------------------
>
>                 Key: HDFS-4992
>                 URL: https://issues.apache.org/jira/browse/HDFS-4992
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer
>            Reporter: Max Lapan
>            Assignee: Max Lapan
>             Fix For: 2.1.0-beta
>
>         Attachments: HDFS-4992-v1.patch, HDFS-4992-v2.patch
>
>
> By default, balancer has 1000 threads which moves blocks around (mover threads) and 200 threads which decide which block to move (dispatcher threads).
> On large clusters, 1000 threads creates significant load on NN, which slows down other HDFS activity. For example, on our cluster, 'hdfs dfs -ls /' command took about 1 minute when balancer is active. When no balancing in progress, the same command finishes in second or two.
> This patch makes amount of threads configurable by two new options 'dfs.balancer.moverThreads' and 'dfs.balancer.dispatcherThreads'.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira