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https://issues.apache.org/jira/browse/AURORA-1075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14310048#comment-14310048
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Jay Buffington commented on AURORA-1075:
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I'm with you on the preemptor logic. If a slave is full of production tasks,
we need to preempt one or more of them to make room for a "cluster service"
task. To always preempt a production job to make room for a cluster service
job, we need a priority spectrum.
You have to statically partition the cluster today anyway so that preemption
will work. I suppose this just furthers that requirement.
IMHO, we can add support for scheduling an instance on every host independently
of supporting "cluster service" priority level. I've opened AURORA-1112 for
that.
> schedule instance on every host matching constraints
> ----------------------------------------------------
>
> Key: AURORA-1075
> URL: https://issues.apache.org/jira/browse/AURORA-1075
> Project: Aurora
> Issue Type: Story
> Components: Scheduler
> Reporter: Jay Buffington
>
> I'd like aurora to schedule an instance of a given job on every host it has
> seen an offer for. So if I were to create this job:
> {noformat}
> import os
> jobs = [Job(
> task=SimpleTask(name="hello_world", command="echo hello world"),
> role=os.getenv('USER'),
> cluster="cluster1",
> instances="*"
> )]
> {noformat}
> It would result in hello world running on every host in the cluster where
> there is room.
> If I were to set constraints (e.g. dedicated role), only hosts matching
> constraints would have the instances started on it.
> If the Job is a production job, instances of other jobs would be preempted if
> necessary to make room for this instance on every host aurora knows about.
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