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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4061) RM only has 1 AM launcher thread
Date Mon, 26 Mar 2012 22:46:28 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238929#comment-13238929
] 

Hudson commented on MAPREDUCE-4061:
-----------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #1943 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/1943/])
    MAPREDUCE-4061. RM only has 1 AM launcher thread (tgraves via bobby) (Revision 1305607)

     Result = FAILURE
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1305607
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/taskclean/TaskCleanerImpl.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/amlauncher/ApplicationMasterLauncher.java

                
> 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: Blocker
>             Fix For: 0.23.2
>
>         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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