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From "Avner BenHanoch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5329) APPLICATION_INIT is never sent to AuxServices other than the builtin ShuffleHandler
Date Wed, 04 Sep 2013 04:39:53 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757460#comment-13757460
] 

Avner BenHanoch commented on MAPREDUCE-5329:
--------------------------------------------

fine.  I'll go for it :)

I understand that in my code I'll need to add 'if' for filtering out the builtin ShuffleHandler
in case the user will mistakenly specify ShuffleHandler among the providers in the "advanced"
config. Right?

                
> APPLICATION_INIT is never sent to AuxServices other than the builtin ShuffleHandler
> -----------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5329
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5329
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am
>    Affects Versions: 2.0.4-alpha
>            Reporter: Avner BenHanoch
>
> APPLICATION_INIT is never sent to AuxServices other than the built-in ShuffleHandler.
 This means that 3rd party ShuffleProvider(s) will not be able to function, because APPLICATION_INIT
enables the AuxiliaryService to map jobId->userId. This is needed for properly finding
the MOFs of a job per reducers' requests.
> NOTE: The built-in ShuffleHandler does get APPLICATION_INIT events due to hard-coded
expression in hadoop code. The current TaskAttemptImpl.java code explicitly call: serviceData.put
(ShuffleHandler.MAPREDUCE_SHUFFLE_SERVICEID, ...) and ignores any additional AuxiliaryService.
As a result, only the built-in ShuffleHandler will get APPLICATION_INIT events.  Any 3rd party
AuxillaryService will never get APPLICATION_INIT events.
> I think a solution can be in one of two ways:
> 1. Change TaskAttemptImpl.java to loop on all Auxiliary Services and register each of
them, by calling serviceData.put (…) in loop.
> 2. Change AuxServices.java similar to the fix in: MAPREDUCE-2668  "APPLICATION_STOP is
never sent to AuxServices".  This means that in case the 'handle' method gets APPLICATION_INIT
event it will demultiplex it to all Aux Services regardless of the value in event.getServiceID().
> I prefer the 2nd solution.  I am welcoming any ideas.  I can provide the needed patch
for any option that people like.
> See [Pluggable Shuffle in Hadoop documentation|http://hadoop.apache.org/docs/current/hadoop-mapreduce-client/hadoop-mapreduce-client-core/PluggableShuffleAndPluggableSort.html]

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