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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-295) java.lang.IncompatibleClassChangeError: Found class org.apache.hadoop.mapreduce.TaskInputOutputContext, but interface was expected in crunch 0.8.0
Date Sat, 16 Nov 2013 20:01:20 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824611#comment-13824611
] 

Josh Wills commented on CRUNCH-295:
-----------------------------------

An update: I have an RC for 0.8.1 in the works, but I can't close the nexus staging repo--
whenever I try, I get a 502 proxy error. Some googling indicates that it could be b/c my public
key isn't available (but it looks to me like it is, see below); or it may be that Apache's
infrastructure is just having some proxy errors in general (there seem to be a lot of tickets
along those lines in INFRA right now, although I'm not sure if they're all related.)

My code keys up on MIT's key server:
http://pgp.mit.edu:11371/pks/lookup?search=jwills%40apache&op=index

> 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
>
> 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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