RM only has 1 AM launcher thread
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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
Priority: Critical
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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