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https://issues.apache.org/jira/browse/SAMZA-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13984417#comment-13984417
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Chris Riccomini commented on SAMZA-124:
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Able to reproduce this on YARN 2.4 with the node locality set to the default of
40.
{noformat}
Task group 0
container_1398721755517_0002_01_000002
host1:8042
Task group 5
container_1398721755517_0002_01_000003
host1:8042
Task group 10
container_1398721755517_0002_01_000004
host1:8042
Task group 24
container_1398721755517_0002_01_000005
host1:8042
Task group 25
container_1398721755517_0002_01_000006
host1:8042
Task group 14
container_1398721755517_0002_01_000007
host1:8042
Task group 20
container_1398721755517_0002_01_000008
host1:8042
Task group 29
container_1398721755517_0002_01_000009
host1:8042
Task group 1
container_1398721755517_0002_01_000010
host1:8042
Task group 6
container_1398721755517_0002_01_000011
host1:8042
Task group 28
container_1398721755517_0002_01_000012
host1:8042
Task group 21
container_1398721755517_0002_01_000013
host1:8042
Task group 9
container_1398721755517_0002_01_000014
host1:8042
Task group 13
container_1398721755517_0002_01_000015
host2:8042
Task group 2
container_1398721755517_0002_01_000016
host2:8042
Task group 17
container_1398721755517_0002_01_000017
host2:8042
Task group 22
container_1398721755517_0002_01_000018
host2:8042
Task group 27
container_1398721755517_0002_01_000019
host2:8042
Task group 12
container_1398721755517_0002_01_000020
host2:8042
Task group 7
container_1398721755517_0002_01_000021
host2:8042
Task group 3
container_1398721755517_0002_01_000022
host2:8042
Task group 18
container_1398721755517_0002_01_000023
host2:8042
Task group 16
container_1398721755517_0002_01_000024
host2:8042
Task group 31
container_1398721755517_0002_01_000025
host2:8042
Task group 11
container_1398721755517_0002_01_000026
host2:8042
Task group 26
container_1398721755517_0002_01_000027
host2:8042
Task group 23
container_1398721755517_0002_01_000028
host3:8042
Task group 8
container_1398721755517_0002_01_000029
host3:8042
Task group 30
container_1398721755517_0002_01_000030
host3:8042
Task group 19
container_1398721755517_0002_01_000031
host3:8042
Task group 4
container_1398721755517_0002_01_000032
host3:8042
Task group 15
container_1398721755517_0002_01_000033
host3:8042
{noformat}
> 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: Jakob Homan
> 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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