Vinod Kumar Vavilapalli commented on YARN-2092:

Okay folks, this is an incompatible change any way we look at it. OSIG/custom 
classloader solutions are good, but they don't exist in their entirety today.

bq.  like from the HADOOP-10104 patch. Which went in because the 2.2+ version 
of jackson was so out of date is was breaking other things.
[~ste...@apache.org], what are these?

We ran into other application failures downstream that depend on jackson. I 
propose that we reopen HADOOP-10104 to revert the patch from branch-2 and leave 
it on trunk unless there is a solid answer to the question immediately above.

> Incompatible org.codehaus.jackson* dependencies when moving from 2.4.0 to 
> 2.5.0-SNAPSHOT
> ----------------------------------------------------------------------------------------
>                 Key: YARN-2092
>                 URL: https://issues.apache.org/jira/browse/YARN-2092
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Hitesh Shah
> Came across this when trying to integrate with the timeline server. Using a 
> 1.8.8 dependency of jackson works fine against 2.4.0 but fails against 
> 2.5.0-SNAPSHOT which needs 1.9.13. This is in the scenario where the user 
> jars are first in the classpath.  

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