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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14706) RegionLocationFinder should return multiple servername by top host
Date Wed, 04 Nov 2015 08:26:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989109#comment-14989109
] 

Hadoop QA commented on HBASE-14706:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12770509/HBASE-14706-trunk_v4.patch
  against master branch at commit ceddec9141b658c790d2fb995c970982ab082028.
  ATTACHMENT ID: 12770509

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
tests.

    {color:green}+1 hadoop versions{color}. The patch compiles with all supported hadoop versions
(2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.6.1 2.7.0 2.7.1)

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 protoc{color}.  The applied patch does not increase the total number of
protoc compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 checkstyle{color}.  The applied patch does not increase the total number
of checkstyle errors

    {color:green}+1 findbugs{color}.  The patch does not introduce any  new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn post-site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/16382//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/16382//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/16382//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/16382//console

This message is automatically generated.

> RegionLocationFinder should return multiple servername by top host
> ------------------------------------------------------------------
>
>                 Key: HBASE-14706
>                 URL: https://issues.apache.org/jira/browse/HBASE-14706
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>    Affects Versions: 2.0.0, 1.2.0, 1.3.0
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-14706-trunk_v1.patch, HBASE-14706-trunk_v2.patch, HBASE-14706-trunk_v3.patch,
HBASE-14706-trunk_v4.patch, HBASE-14706.patch
>
>
> Multiple RS can run on the same host. But in current RegionLocationFinder, mapHostNameToServerName
map one host to only one server. This will make LocalityCostFunction get wrong locality about
region.
> {code}
>     // create a mapping from hostname to ServerName for fast lookup
>     HashMap<String, ServerName> hostToServerName = new HashMap<String, ServerName>();
>     for (ServerName sn : regionServers) {
>       hostToServerName.put(sn.getHostname(), sn);
>     }
> {code}



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