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https://issues.apache.org/jira/browse/MAPREDUCE-4061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239474#comment-13239474
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Hudson commented on MAPREDUCE-4061:
-----------------------------------
Integrated in Hadoop-Mapreduce-trunk #1032 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1032/])
MAPREDUCE-4061. RM only has 1 AM launcher thread (tgraves via bobby)
(Revision 1305607)
Result = SUCCESS
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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