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https://issues.apache.org/jira/browse/HDFS-4420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559554#comment-13559554
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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/12565926/Balancer-exclude-trunk.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:red}-1 findbugs{color}. The patch appears to introduce 1 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:green}+1 core tests{color}. The patch passed unit tests in
hadoop-hdfs-project/hadoop-hdfs.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/3863//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HDFS-Build/3863//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3863//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.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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