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Posted to dev@crunch.apache.org by "Josh Wills (JIRA)" <ji...@apache.org> on 2013/11/15 17:25:22 UTC
[jira] [Commented] (CRUNCH-295)
java.lang.IncompatibleClassChangeError: Found class
org.apache.hadoop.mapreduce.TaskInputOutputContext, but interface was
expected in crunch 0.8.0
[ https://issues.apache.org/jira/browse/CRUNCH-295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13823772#comment-13823772 ]
Josh Wills commented on CRUNCH-295:
-----------------------------------
We started compiling against both hadoop-1 and hadoop-2 for releases in 0.7.0. To be clear, what command are you running? Just [mvn clean install]? What does [mvn clean install -Dcrunch.platform=1] do?
> 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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