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https://issues.apache.org/jira/browse/HDFS-4992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709663#comment-13709663
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Hadoop QA commented on HDFS-4992:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12592507/HDFS-4992-v2.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any
warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:red}-1 core tests{color}. The patch failed these unit tests in
hadoop-hdfs-project/hadoop-hdfs:
org.apache.hadoop.hdfs.server.balancer.TestBalancerWithNodeGroup
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/4661//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4661//console
This message is automatically generated.
> 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
> 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'.
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