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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-5290) ResourceManager can place more containers on a node than the node size allows
Date Wed, 22 Jun 2016 19:48:16 GMT
Jason Lowe created YARN-5290:
--------------------------------

             Summary: ResourceManager can place more containers on a node than the node size
allows
                 Key: YARN-5290
                 URL: https://issues.apache.org/jira/browse/YARN-5290
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
            Reporter: Jason Lowe


When the ResourceManager or an ApplicationMaster kills a container the RM scheduler instantly
thinks the container is dead and frees those resources within the scheduler bookkeeping. 
However that container can still be running on the node until the node heartbeats back into
the RM and is told to kill the container.  If the RM allocates the space associated with the
released container and gives it to an AM quickly enough, the AM can launch a new container
while the old container is still running on the NM.  That leads to a scenario where we're
technically running more resources on the node than the node advertised to the RM.



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