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https://issues.apache.org/jira/browse/HBASE-13995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14608609#comment-14608609
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Hadoop QA commented on HBASE-13995:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12742861/HBASE-13995-v0.patch
  against master branch at commit f8bd578b80b4e656d799c82ca1b6191e35bb0ae4.
  ATTACHMENT ID: 12742861

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

    {color:green}+1 tests included{color}.  The patch appears to include 3 new 
or modified tests.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: 
https://builds.apache.org/job/PreCommit-HBASE-Build/14626//console

This message is automatically generated.

> ServerName is not fully case insensitive
> ----------------------------------------
>
>                 Key: HBASE-13995
>                 URL: https://issues.apache.org/jira/browse/HBASE-13995
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 2.0.0, 1.2.0, 0.98.12.1, 1.0.1.1, 1.1.0.1
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>             Fix For: 2.0.0, 0.98.14, 1.0.2, 1.2.0, 1.1.1
>
>         Attachments: HBASE-13995-v0.patch, HBASE-13995-v0.patch
>
>
> we ended up with two ServerName with different cases, AAA and aaa.
> Trying to create a table, every once in a while, we ended up with the region 
> lost and not assigned. 
> BaseLoadBalancer.roundRobinAssignment() goes through each server and create a 
> map with what to assign to them.
> We had to server on the list AAA and aaa which are the same machine, the 
> problem is that the round robin now is assigning an empty list to one of the 
> two. so depending on the order we ended up with a region not assigned.
> ServerName equals() does the case insensitive comparison but the hashCode() 
> is done on a case sensitive server name, so the Map in ServerManager will 
> never hit the item and compare it using equals, so we end up with two entries 
> that are the same server. similar thing for 
> ServerName.isSameHostnameAndPort() where we don't check for cases



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