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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-599) Refactoring submitApplication in ClientRMService and RMAppManager
Date Mon, 22 Apr 2013 22:25:15 GMT
Zhijie Shen created YARN-599:
--------------------------------

             Summary: Refactoring submitApplication in ClientRMService and RMAppManager
                 Key: YARN-599
                 URL: https://issues.apache.org/jira/browse/YARN-599
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Zhijie Shen
            Assignee: Zhijie Shen


Currently, ClientRMService#submitApplication call RMAppManager#handle, and consequently call
RMAppMangager#submitApplication directly, though the code looks like scheduling an APP_SUBMIT
event.

In addition, the validation code before creating an RMApp instance is not well organized.
Ideally, the dynamic validation, which depends on the RM's configuration, should be put in
RMAppMangager#submitApplication. RMAppMangager#submitApplication is called by ClientRMService#submitApplication
and RMAppMangager#recover. Since the configuration may be changed after RM restarts, the validation
needs to be done again even in recovery mode. Therefore, resource request validation, which
based on min/max resource limits, should be moved from ClientRMService#submitApplication to
RMAppMangager#submitApplication. On the other hand, the static validation, which is independent
of the RM's configuration should be put in ClientRMService#submitApplication, because it is
only need to be done once during the first submission.

Furthermore, try-catch flow in RMAppMangager#submitApplication has a flaw. RMAppMangager#submitApplication
has a flaw is not synchronized. If two application submissions with the same application ID
enter the function, and one progresses to the completion of RMApp instantiation, and the other
progresses the completion of putting the RMApp instance into rmContext, the slower submission
will cause an exception due to the duplicate application ID. However, the exception will cause
the RMApp instance already in rmContext (belongs to the faster submission) being rejected
with the current code flow.

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