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From "Vitaly Brodetskyi (JIRA)" <>
Subject [jira] [Created] (AMBARI-20821) Update default values for YARN preemption in Ambari
Date Fri, 21 Apr 2017 15:20:04 GMT
Vitaly Brodetskyi created AMBARI-20821:

             Summary: Update default values for YARN preemption in Ambari
                 Key: AMBARI-20821
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
            Reporter: Vitaly Brodetskyi
            Assignee: Vitaly Brodetskyi
             Fix For: 2.5.1

Set 1) "yarn.resourcemanager.monitor.capacity.preemption.total_preemption_per_round" should
>= 1 / #cluster-nodes. (For example, cluster has 20 nodes, total_preemption_per_round should
be at least 1 / 20 = 0.05. (By default this is 0.1)
This really should be part of stack-advisor.
Set 2) yarn.resourcemanager.monitor.capacity.preemption.natural_termination_factor = 1 (by
default is 0.2).
The two configs will affect preemption for large containers like LLAP. We will put these suggestions
to documentation, but it will be also good if we can update them in Ambari.

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