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https://issues.apache.org/jira/browse/HDFS-4420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971637#comment-13971637
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Hadoop QA commented on HDFS-4420:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12592319/HDFS-4420-v4.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 1 new
or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc 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.namenode.TestCacheDirectives
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/6674//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6674//console
This message is automatically generated.
> Provide a way to exclude subtree from balancing process
> -------------------------------------------------------
>
> Key: HDFS-4420
> URL: https://issues.apache.org/jira/browse/HDFS-4420
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer
> Reporter: Max Lapan
> Priority: Minor
> Attachments: Balancer-exclude-subtree-0.90.2.patch,
> Balancer-exclude-trunk-v2.patch, Balancer-exclude-trunk-v3.patch,
> Balancer-exclude-trunk.patch, HDFS-4420-v4.patch
>
>
> During balancer operation, it balances all blocks, regardless of their
> filesystem hierarchy. Sometimes, it would be usefull to exclude some subtree
> from balancing process.
> For example, regionservers data locality is cruical for HBase performance.
> Region's data is tied to regionservers, which reside on specific machines in
> cluster. During operation, regionservers reads and writes region's data, and
> after some time, all this data are reside on local machine, so, all reads
> become local, which is great for performance. Balancer breaks this locality
> during opertation by moving blocks around.
> This patch adds [-exclude <path>] switch, and, if path is provided,
> balancer will not move blocks under this path during operation.
> Attached patch have tested for 0.90.2.
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