[jira] [Created] (YARN-5887) Policies for choosing which opportunistic containers to kill

["Konstantinos Karanasos (JIRA)" <ji...@apache.org>]

Konstantinos Karanasos created YARN-5887:
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             Summary: Policies for choosing which opportunistic containers to kill
                 Key: YARN-5887
                 URL: https://issues.apache.org/jira/browse/YARN-5887
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Konstantinos Karanasos


When a guaranteed container arrives at an NM but there are no resources to start its execution, opportunistic containers will be killed to make space for the guaranteed container.

At the moment, we kill opportunistic containers in reverse order of arrival (first the most recently started ones). This is not always the right decision. 
For example, we might want to minimize the number of containers killed: to start a 6GB container, we could kill one 6GB opportunistic or three 2GB ones. 
Another example would be to refrain from killing containers of jobs that are very close to completion (we have to pass job completion information to the NM in that case).



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