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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-599) Refactoring submitApplication in ClientRMService and RMAppManager
Date Tue, 30 Apr 2013 04:58:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645248#comment-13645248

Hadoop QA commented on YARN-599:

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/844//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/844//console

This message is automatically generated.
> 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
>         Attachments: YARN-599.1.patch, YARN-599.2.patch
> Currently, ClientRMService#submitApplication call RMAppManager#handle, and consequently
call RMAppMangager#submitApplication directly, though the code looks like scheduling an APP_SUBMIT
> 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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