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https://issues.apache.org/jira/browse/YARN-3367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14948044#comment-14948044
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Naganarasimha G R commented on YARN-3367:
-----------------------------------------

bq.  There is still no hard guarantee that they will be received by the server 
in the same order.
But as per the current patch If events are queued and sent one by one from the 
client then server should receive in the same order right ?, Basically its not 
multi threaded dispatcher but all events are queued and dispatched in a 
separate thread.

> Replace starting a separate thread for post entity with event loop in 
> TimelineClient
> ------------------------------------------------------------------------------------
>
>                 Key: YARN-3367
>                 URL: https://issues.apache.org/jira/browse/YARN-3367
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Junping Du
>            Assignee: Naganarasimha G R
>         Attachments: YARN-3367.YARN-2928.001.patch
>
>
> Since YARN-3039, we add loop in TimelineClient to wait for 
> collectorServiceAddress ready before posting any entity. In consumer of  
> TimelineClient (like AM), we are starting a new thread for each call to get 
> rid of potential deadlock in main thread. This way has at least 3 major 
> defects:
> 1. The consumer need some additional code to wrap a thread before calling 
> putEntities() in TimelineClient.
> 2. It cost many thread resources which is unnecessary.
> 3. The sequence of events could be out of order because each posting 
> operation thread get out of waiting loop randomly.
> We should have something like event loop in TimelineClient side, 
> putEntities() only put related entities into a queue of entities and a 
> separated thread handle to deliver entities in queue to collector via REST 
> call.



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