[jira] [Created] (CRUNCH-235) Avoid exposing incompatible Hadoop classes in Crunch API

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

Tom White created CRUNCH-235:
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             Summary: Avoid exposing incompatible Hadoop classes in Crunch API
                 Key: CRUNCH-235
                 URL: https://issues.apache.org/jira/browse/CRUNCH-235
             Project: Crunch
          Issue Type: Improvement
          Components: Core
            Reporter: Tom White
            Assignee: Tom White


Between Hadoop 1 and 2, org.apache.hadoop.mapreduce.Counter changed from a class to an interface. Therefore, exposing Counter in Crunch's API means that Crunch programs may need to be recompiled when moving from a Hadoop 1 to a Hadoop 2 cluster. It would be nice to avoid the need to recompile. 

Note that Crunch itself has two artifacts - one for each major version of Hadoop - and the change proposed here would not alter that, it would just mean that the same Crunch program binary could be used with either Crunch artifact.

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