Dmitriy V. Ryaboy commented on PIG-660:

Your stacktrace shows hadoop.dfs calls (as opposed to hdfs) which tells me it's 
looking for -- and finding -- hadoop 18 classes.

Can you do this:

ant clean; ant -Dhadoop.version=20

any try again?

Just to be sure, try moving hadoop1* out of the lib directory (so that it for 
sure fails if it's trying to look for 18).

> Integration with Hadoop 0.20
> ----------------------------
>                 Key: PIG-660
>                 URL: https://issues.apache.org/jira/browse/PIG-660
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.2.0
>         Environment: Hadoop 0.20
>            Reporter: Santhosh Srinivasan
>            Assignee: Santhosh Srinivasan
>             Fix For: 0.4.0
>         Attachments: PIG-660-for-branch-0.3.patch, PIG-660.patch, 
> PIG-660_1.patch, PIG-660_2.patch, PIG-660_3.patch, PIG-660_4.patch, 
> PIG-660_5.patch, pig_660_shims.patch, pig_660_shims_2.patch, 
> pig_660_shims_3.patch
> With Hadoop 0.20, it will be possible to query the status of each map and 
> reduce in a map reduce job. This will allow better error reporting. Some of 
> the other items that could be on Hadoop's feature requests/bugs are 
> documented here for tracking.
> 1. Hadoop should return objects instead of strings when exceptions are thrown
> 2. The JobControl should handle all exceptions and report them appropriately. 
> For example, when the JobControl fails to launch jobs, it should handle 
> exceptions appropriately and should support APIs that query this state, i.e., 
> failure to launch jobs.

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