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https://issues.apache.org/jira/browse/SPARK-23485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16374748#comment-16374748
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Imran Rashid commented on SPARK-23485:
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ok the missing jar was a bad example on kubernetes ... I still wouldn't be
surprised if there is some app-specific failure mode we're failing to take into
account.
I think you are too confident in kubernetes ability to detect problems with
nodes -- I don't know what it does but I don't think it is possible for it
handle this. It would be great if we really could rely on the separation of
concerns you want; in practice that just doesn't work because the app has more
info.
It almost sounds like you think Spark should not even use any internal
blacklisting with kubernetes -- from experience with large non-kubernetes
deployments, I think that is a bad idea.
> Kubernetes should support node blacklist
> ----------------------------------------
>
> Key: SPARK-23485
> URL: https://issues.apache.org/jira/browse/SPARK-23485
> Project: Spark
> Issue Type: New Feature
> Components: Kubernetes, Scheduler
> Affects Versions: 2.3.0
> Reporter: Imran Rashid
> Priority: Major
>
> Spark's BlacklistTracker maintains a list of "bad nodes" which it will not
> use for running tasks (eg., because of bad hardware). When running in yarn,
> this blacklist is used to avoid ever allocating resources on blacklisted
> nodes:
> https://github.com/apache/spark/blob/e836c27ce011ca9aef822bef6320b4a7059ec343/resource-managers/yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnSchedulerBackend.scala#L128
> I'm just beginning to poke around the kubernetes code, so apologies if this
> is incorrect -- but I didn't see any references to
> {{scheduler.nodeBlacklist()}} in {{KubernetesClusterSchedulerBackend}} so it
> seems this is missing. Thought of this while looking at SPARK-19755, a
> similar issue on mesos.
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