Li Lu commented on YARN-4444:

Thanks [~leftnoteasy]! I'm also thinking about the solution for now. Shall we 
make our best effort to recover the timeline client on such kind of an error? 
The problem happened when jackson tries to find a serializer to write json. If 
this is going to hide the problem then probably the right thing to do is to 
crash the client anyways. 

> TimelineClientImpl#doPosting should not fail on AbstractMethodError
> -------------------------------------------------------------------
>                 Key: YARN-4444
>                 URL: https://issues.apache.org/jira/browse/YARN-4444
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Li Lu
>            Assignee: Li Lu
>         Attachments: YARN-4444-trunk.001.patch
> We noticed there were application failures due to incompatible jackson 
> changes. While the compatibility story is on the ATS user's side, the 
> timeline client should not fail the whole process on AbstractMethodError.

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