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From "Li Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3367) Replace starting a separate thread for post entity with event loop in TimelineClient
Date Tue, 22 Sep 2015 22:03:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14903527#comment-14903527
] 

Li Lu commented on YARN-3367:
-----------------------------

Also, I looked at the patch. One general comment is that, the logic of {{TimelineEntityAsyncDispatcher}}
is pretty similar to {{AsyncDispatcher}}. Since the code segments that handling concurrency
is normally considered as non-trivial, maybe we should refactor {{AsycnDispatcher}}'s code
and reuse it, rather than follow the logic here? Will there be any unforeseen challenges on
this? Thanks! 

> 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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