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https://issues.apache.org/jira/browse/HBASE-2864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891263#action_12891263
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Jean-Daniel Cryans commented on HBASE-2864:
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This was fixed by HBASE-2599 which wasn't applied to branch because it breaks
rolling restarts.
> HBase handling of host names is case sensitive
> ----------------------------------------------
>
> Key: HBASE-2864
> URL: https://issues.apache.org/jira/browse/HBASE-2864
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.20.5, 0.89.20100621
> Environment: Linux
> Reporter: Mathias Herberts
> Priority: Critical
> Fix For: 0.90.0
>
>
> Our HBase cluster showed weird multiple assigments of all regions.
> Master logs showed that every minute region assignments were all determined
> invalid and regions were being re-assigned.
> The reason for the assignements to be found invalid is that they were done on
> hosts whose name in /etc/hosts was in lowercase but whose name in the DNS was
> in uppercase.
> In BaseScanner.java:572, the HServerInfo is retrieved using the servername as
> key. As the name comes from the DNS, it was all uppercase and thus no
> HServerInfo could be found.
> The DNS cache needs to have its keys converted to lowercase to avoid this
> (HServerInfo.java:245).
> This is a major problem because simple changes to the DNS infrastructure can
> cause major data corruption in HBase.
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