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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CRUNCH-295) java.lang.IncompatibleClassChangeError: Found class org.apache.hadoop.mapreduce.TaskInputOutputContext, but interface was expected in crunch 0.8.0
Date Thu, 21 Nov 2013 22:00:35 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Josh Wills resolved CRUNCH-295.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 0.8.1

The 0.8.1 release is up w/the fix for this. Thanks Stefan!

> java.lang.IncompatibleClassChangeError: Found class org.apache.hadoop.mapreduce.TaskInputOutputContext,
but interface was expected in crunch 0.8.0
> --------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CRUNCH-295
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-295
>             Project: Crunch
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.8.0
>            Reporter: Stefan De Smit
>            Assignee: Josh Wills
>             Fix For: 0.8.1
>
>
> Crunch 0.8.0 does not work for me, while crunch 0.7.0 did.
> To be more precise: when I compile crunch 0.8.0 from the git tag, it does work, but the
jars downloaded from Maven Central don't.
> I compared both jars (mine vs downloaded) and they are indeed different.
> you can see (for instance in CrunchTaskContext):
> invokevirtual	#4; //Method org/apache/hadoop/mapreduce...
> vs
> invokeinterface	#4,  1; //InterfaceMethod org/apache/hadoop/mapreduce...
> Which means that crunch 0.8.0 is compiled with an interface iso an abstract class.
> the hadoop-1 profile shows a dependency to hadoop 1.1.2 which contains a class iso an
interface.
> What we think happened is this:
> 1) compile crunch with hadoop-2 profile:
> 2) on same machine also compile crunch with hadoop-1 profile, but without clean option.
> because of the missing clean, maven won't recompile unchanged classes. which would explain
how you end up with crunch 0.8.0 being compiled against hadoop-2 instead of hadoop-1



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