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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2864) HBase handling of host names is case sensitive
Date Thu, 22 Jul 2010 17:53:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891263#action_12891263

Jean-Daniel Cryans commented on HBASE-2864:

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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