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  1. OpenShift Bugs
  2. OCPBUGS-35952

Autoscaler balance similar node groups failed on aws

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      * The AWS Cloud Controller Manager adds an AWS-specific zone identifier label to `Node` objects.
      The value of the label can vary between nodes which are otherwise similar in topology, causing the cluster autoscaler to not consider them as similar.
      This release updates the Cluster Autoscaler Operator configuration for AWS to ignore this label so that the nodes are considered as similar.
      (link:https://issues.redhat.com/browse/OCPBUGS-35952[*OCPBUGS-35952*])
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      * The AWS Cloud Controller Manager adds an AWS-specific zone identifier label to `Node` objects. The value of the label can vary between nodes which are otherwise similar in topology, causing the cluster autoscaler to not consider them as similar. This release updates the Cluster Autoscaler Operator configuration for AWS to ignore this label so that the nodes are considered as similar. (link: https://issues.redhat.com/browse/OCPBUGS-35952 [* OCPBUGS-35952 *])
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      Description of problem:

      Autoscaler balance similar node groups failed on aws when run regression for https://issues.redhat.com/browse/OCPCLOUD-2616

      Version-Release number of selected component (if applicable):

      4.17.0-0.nightly-2024-06-20-165244

      How reproducible:

      Always

      Steps to Reproduce:

      1. Create clusterautoscaler with balanceSimilarNodeGroups: true
2. Create 2 machineautoscaler min/max 1/8
3. Add workload

      Actual results:

      Couldn't see the "splitting scale-up" message from the cluster-autoscalerlogs. 
must-gather: https://drive.google.com/file/d/17aZmfQHKZxJEtqPvl37HPXkXA36Yp6i8/view?usp=sharing 2024-06-21T13:21:08.678016167Z 

I0621 13:21:08.678006       1 compare_nodegroups.go:157] nodes template-node-for-MachineSet/openshift-machine-api/zhsun-aws21-5slwv-worker-us-east-2b-5109433294514062211 and template-node-for-MachineSet/openshift-machine-api/zhsun-aws21-5slwv-worker-us-east-2c-760092546639056043 are not similar, labels do not match
2024-06-21T13:21:08.678030474Z I0621 13:21:08.678021       1 orchestrator.go:249] No similar node groups found

      Expected results:

      balanceSimilarNodeGroups works well

      Additional info:

       

              mimccune@redhat.com Michael McCune
              rhn-support-zhsun Zhaohua Sun
              Zhaohua Sun Zhaohua Sun
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