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https://issues.apache.org/jira/browse/YARN-3276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14341023#comment-14341023
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Junping Du commented on YARN-3276:
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Hi [~gtCarrera], you are right that specific case here won't cause NPE. I think
I should fix my previous comments in YARN-3087 with following: for more generic
case that it is not a good practice (or even we can say dangerous) to cast a
null object, which could potentially cause some exceptions, like NPE (if
unboxing afterwards) or incompatible type exception (null object comes from a
different type). :)
> Fix NPE and refactor in some map cast for TimelineEntity
> --------------------------------------------------------
>
> 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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