Marc Reichman created HBASE-7618:
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Summary: 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
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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