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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4061) RM only has 1 AM launcher thread
Date Mon, 26 Mar 2012 20:10:46 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238760#comment-13238760
] 

Hadoop QA commented on MAPREDUCE-4061:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12519993/MAPREDUCE-4061.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in .

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2104//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2104//console

This message is automatically generated.
                
> RM only has 1 AM launcher thread
> --------------------------------
>
>                 Key: MAPREDUCE-4061
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4061
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.2
>            Reporter: Thomas Graves
>            Assignee: Thomas Graves
>            Priority: Critical
>         Attachments: MAPREDUCE-4061.patch
>
>
> The application master launcher has a thread pool that is configured with core size 1,
maximum 10.  The thread pool will not create over
> the core size thread unless the queue it is using is full. We are using an unbounded
queue, so the thread pool will only ever create 1 thread.  We need to have more then 1 AM
launch thread.
> If that thread becomes hung for some reason, the RM can no longer launch any application
masters.  We have seen an instance of this when a NM become unresponsive - something bad happened
to host, not sure what yet.  

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