Wangda Tan commented on YARN-4444:

[~gtCarrera], I'm OK with this fix. I think this change is a compatible change 
(AbstractMethodError is not part of TimelineClient api).

However, I'm not sure if it is possible that downstream project tries to catch 
and handle this Error, it's better to get some reviews from TimelineClient 

> 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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