[jira] Updated: (HBASE-2864) HBase handling of host names is case sensitive

["stack (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-2864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-2864:
-------------------------

    Fix Version/s: 0.90.0
             Tags: DNS noob  (was: DNS)
         Priority: Critical  (was: Major)

Thanks Mathias.  This is a silly one.  Bringing into 0.90.0.  Marking as critical.

> 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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