Chenya Zhang created YUNIKORN-830:
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Summary: Node sorting need to support "preferredDuringScheduling"
node affinity
Key: YUNIKORN-830
URL: https://issues.apache.org/jira/browse/YUNIKORN-830
Project: Apache YuniKorn
Issue Type: New Feature
Components: core - scheduler
Reporter: Chenya Zhang
Assignee: Chenya Zhang
YuniKorn scheduler is able to allocate pods based on the node affinity policy
"requiredDuringScheduling", but not "preferredDuringScheduling" yet.
YuniKorn currently does a full node sorting every time. After
[https://github.com/apache/incubator-yunikorn-core/pull/307], we will do
sorting incrementally with an ordered B-tree. It can make scheduling different
pods to preferred nodes a bit complicated.
Discussed with [~cheersyang] [~yuchaoran2011] for a potential solution:
* Parse node label’s from the shim and send that to the core over SI (via
node attributes).
* Parse the pod node-affinity preference in the shim and send that to the core.
* Implement something in GetSchedulableNodeIterator().. today we directly
retrieve nodes from btree with asce order; we still loop the nodes once, but
keep 2 list, one for preferred nodes; when we iterate nodes in the scheduling
cycle, we iterate the preferred list first.
Adding [~wilfreds] [~kmarton] for more discussion too.
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