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https://issues.apache.org/jira/browse/SAMZA-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13989941#comment-13989941
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Chris Riccomini commented on SAMZA-124:
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OK, node locality set to 40 with capacity scheduler *still* puts all 32
containers on only 4 out of 14 nodes. The rest remain empty. It seems that
specifically asking for hosts with capacity and node locality set to 40 is
still ignored.
> Provide AM based antiaffinity to avoid clumping of containers
> -------------------------------------------------------------
>
> Key: SAMZA-124
> URL: https://issues.apache.org/jira/browse/SAMZA-124
> Project: Samza
> Issue Type: Improvement
> Components: container
> Affects Versions: 0.6.0
> Reporter: Jakob Homan
> Assignee: Chris Riccomini
> Fix For: 0.7.0
>
>
> We're seeing YARN scheduling lots of containers on the same box causing NIC
> saturation and cluster degradation. Pending SAMZA-74 (and its dependency,
> YARN-1042), it would be good to have some basic anti-affinity support at the
> AM level. We can be selective about what nodes we request and accept from
> the RM, hopefully spreading the containers around the cluster more evenly.
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