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https://issues.apache.org/jira/browse/YARN-5830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15781991#comment-15781991
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Karthik Kambatla commented on YARN-5830:
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[~yufeigu], thanks for working on this.
The patch seems to introduce potentialContainers to track a potential set of
containers that includes an AM container as we consider multiple nodes. But, I
am a little confused by how we handle if we encounter an AM container. Can you
explain your high-level approach?
I haven't looked closely, but other minor comments:
# In the same method, I seemed to have forgotten a TODO (KK) item. Mind
creating a follow-up jira and annotating the TODO with that jira instead of my
initials? Thanks.
# Instead of introducing a new list (containersAMLast), can we just use
containersToCheck? May be, remove AM containers first and then add them all at
the end?
# I think I saw a couple of typos too.
> 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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