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https://issues.apache.org/jira/browse/YARN-3276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350624#comment-14350624
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Junping Du commented on YARN-3276:
----------------------------------

Another reason that we cannot merge two TimelineUtils is: the existing 
YARN-COMMON one has dependency on 
org.apache.hadoop.yarn.webapp.YarnJacksonJaxbJsonProvider which is in 
YARN-COMMON now. It will cause cycle dependency if we do the merge work. 
[~zjshen], mind to check it again?

> Refactor and fix null casting in some map cast for TimelineEntity (old and 
> new)
> -------------------------------------------------------------------------------
>
>                 Key: YARN-3276
>                 URL: https://issues.apache.org/jira/browse/YARN-3276
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: YARN-3276-v2.patch, YARN-3276.patch
>
>
> Per discussion in YARN-3087, we need to refactor some similar logic to cast 
> map to hashmap and get rid of NPE issue.



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