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Fix comment and optimize code
**What this PR does / why we need it**:
Fix comment and optimize code.
Thanks.
**Special notes for your reviewer**:
**Release note**:
```release-note
```
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Avoid unnecessary memory allocations
Low-hanging fruits in saving memory allocations. During our 5000-node kubemark runs I've see this:
ControllerManager:
- 40.17% k8s.io/kubernetes/pkg/util/system.IsMasterNode
- 19.04% k8s.io/kubernetes/pkg/controller.(*PodControllerRefManager).Classify
Scheduler:
- 42.74% k8s.io/kubernetes/plugin/pkg/scheduler/algrorithm/predicates.(*MaxPDVolumeCountChecker).filterVolumes
This PR is eliminating all of those.
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Optimize pod affinity when predicate
Optimize by returning as early as possible to avoid invoking priorityutil.PodMatchesTermsNamespaceAndSelector.
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Add use case to service affinity
Also part of nits in refactoring predicates, I found the explanation of `serviceaffinity` in its comment is very hard to understand. So I added example instead here to help user/developer to digest it.
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Make iscsi pv/pvc aware of nodiskconflict feature
Being iscsi a `RWO, ROX` volume we should conflict if more than one pod is using same iscsi LUN.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
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Do not create selector and namespaces in a loop where possible
With 1000 nodes and 5000 pods (5 pods per node) with anti-affinity a lot of CPU wasted on creating LabelSelector and sets.String (map).
With this change we are able to deploy that number of pods in ~25 minutes. Without - it takes 30 minutes to deploy 500 pods with anti-affinity configured.
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[scheduler] Use V(10) for anything which may be O(N*P) logging
Fixes#37014
This PR makes sure that logging statements which are capable of being called on a perNode / perPod basis (i.e. non essential ones that will just clog up logs at large scale) are at V(10) level.
I dreamt of a levenstein filter that built a weak map of word frequencies and alerted once log throughput increased w/o varying information content.... but then I woke up and realized this is probably all we really need for now :)
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split scheduler priorities into separate files
In the current state it's really hard to find a thing one is looking for, if he doesn't know already know where to look. cc @davidopp
- Prevents kubelet from overwriting capacity during sync.
- Handles opaque integer resources in the scheduler.
- Adds scheduler predicate tests for opaque resources.
- Validates opaque int resources:
- Ensures supplied opaque int quantities in node capacity,
node allocatable, pod request and pod limit are integers.
- Adds tests for new validation logic (node update and pod spec).
- Added e2e tests for opaque integer resources.
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Predicate cacheing and cleanup
Fix to #31795
First pass @ cleanup and caching of the CheckServiceAffinity function.
The cleanup IMO is necessary because the logic around the pod listing and the use of the "implicit selector" (which is reverse engineered to enable the homogenous pod groups).
Should still pass the E2Es.
@timothysc @wojtek-t
Comments addressed, Make emptyMetadataProducer a func to avoid casting,
FakeSvcLister: remove error return for len(svc)=0. New test for
predicatePrecomp to make method semantics explictly enforced when meta
is missing. Precompute wrapper.
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Refactor scheduler to enable switch on equivalence cache
Part 2 of #30844
Refactoring to enable easier switch on of equivalence cache.
