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https://issues.apache.org/jira/browse/YARN-5830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15784024#comment-15784024
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Yufei Gu commented on YARN-5830:
--------------------------------
[~kasha], thanks for the review.
The high-level approach:
1. In first nodes, sort the containersToCheck list by putting all non-AM
containers first.
2. We check containers one by one. If we are lucky to found a solution without
any AM container, just return the container list. But not lucky and we find a
solution with AM container, we record this solution in {{potentialContainers}}
and {{break}} here to move to next node because we may find an solution without
AM container in next node.
3. Repeat step 1 and 2 for each node, the only difference is if we've already
got a solution with AM container, we can {{break}} the loop once we meet first
AM container.
4. Return the {{potentialContainers}} if we cannot find any solution without AM
containers.
> Avoid preempting AM containers
> ------------------------------
>
> Key: YARN-5830
> URL: https://issues.apache.org/jira/browse/YARN-5830
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: fairscheduler
> Reporter: Karthik Kambatla
> Assignee: Yufei Gu
> Attachments: YARN-5830.001.patch
>
>
> While considering containers for preemption, avoid AM containers unless
> absolutely necessary.
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