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Posted to issues@hbase.apache.org by "Marc Reichman (JIRA)" <ji...@apache.org> on 2013/01/17 23:32:12 UTC
[jira] [Created] (HBASE-7618) Reverse DNS in TableInputFormat still
leaves trailing period
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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