Zhijie Shen commented on YARN-2837:

bq. One question is, are we planning to support more types of status 
information in the future?

Timeline server is the stateless machine. Currently, the only state I think of 
now is the delegation token. Maybe in future, if we use queue to buffer the 
requests to process, we need to store those too when restarting the timeline 
server. IAC, let's leave it later.

bq. Shall we further restrict its visibility to YARN only (by 

AFAIK, {{@Private}} equals to {{@LimitedPrivate("current project")}}, while 
{{@LimitedPrivate}} can mark a class private to others and multiple sub 

> Timeline server needs to recover the timeline DT when restarting
> ----------------------------------------------------------------
>                 Key: YARN-2837
>                 URL: https://issues.apache.org/jira/browse/YARN-2837
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>            Priority: Blocker
>         Attachments: YARN-2837.1.patch, YARN-2837.2.patch
> Timeline server needs to recover the stateful information when restarting as 
> RM/NM/JHS does now. So far the stateful information only includes the 
> timeline DT. Without recovery, the timeline DT of the existing YARN apps is 
> not long valid, and cannot be renewed any more after the timeline server is 
> restarted.

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