Avner BenHanoch created YARN-802:
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Summary: APPLICATION_INIT is never sent to AuxServices other than
the builtin ShuffleHandler
Key: YARN-802
URL: https://issues.apache.org/jira/browse/YARN-802
Project: Hadoop YARN
Issue Type: Bug
Components: applications, nodemanager
Affects Versions: 2.0.4-alpha
Reporter: Avner BenHanoch
APPLICATION_INIT is never sent to AuxServices other than the builtin
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 ger 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.
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