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Currently, hostfactory does not calculate with pre-started service. but can not return the hosts with pre-started services. This causes the huge waste. Our user case for an app
4 scheduled hosts up 24x7 with 40 pre-start services to meet our short running interactive job
When say 2000 tasks coming, HostFactory launches say 30 hosts to meet SLA
When all jobs done, those 40 pre-start services randomly scattered on numerous hosts. HostFactory can not return the hosts with those pre-started allocation.
We have tried "Stacked" resource plan and resourcePreference=StackedSessions which have a little help for our user case. Most of time we ended up 15 hosts with pre-started allocation rather than 4 hosts as we expecting.
Disabling pre-start service impacts interactive job running time.
A parameter at requestor level to allow HF returns host with no tasks running but with pre-started service should be helpful.
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