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https://issues.apache.org/jira/browse/HBASE-7618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell closed HBASE-7618.
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> Reverse DNS in TableInputFormat still leaves trailing period
> ------------------------------------------------------------
>
> Key: HBASE-7618
> URL: https://issues.apache.org/jira/browse/HBASE-7618
> Project: HBase
> Issue Type: Bug
> Components: mapreduce
> Affects Versions: 0.94.2
> Environment: Linux CentOS 6.3 x64, Oracle JDK 6u27 x64
> Reporter: Marc Reichman
> Priority: Major
>
> There have been several tickets dealing with reverse DNS inconsistencies
> causing issues in HBase. I have found that using the TableMapper and
> TableInputFormat with HBase leads to a situation where there is no data
> locality in situations where the task tracker DNS name and input split
> location provided by the input format differ by a trailing period.
> In this case I have 0% data-local and 100% rack-local map tasks which take on
> this format:
> task host: /default-rack/hostname.ext
> input split: /default-rack/hostname.ext.
> It seems to be a crapshoot on whether the task will land on the proper host.
> The reverse DNS seems to be done differently for this class compared to the
> others already fixed; It uses the hadoop core DNS util class.
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