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Change the reconcile logic to include machines being deleted #342

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merged 1 commit into from
Jun 15, 2018

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k4leung4
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What this PR does / why we need it:
This changes the logic from not counting machines that are being deleted
towards the machineset replica to counting them. The reason for the
change is that due to machine deletion taking non-trivial amount of
time, machine deployment rolling update may exceed the expected number
of machines utilized.

For example, for a machine set with 3 replicas and max surge 1, for a
max of 4 machines.

  • create new machine in new machineset (4 machines)
  • once new machine is ready, delete a machine from old machineset (4 machines, as machine is still being deleted)
  • create new machine as deleted machine is not counted (5 machines)

For the duration of the old machine being deleted, we would exceed the
number of machines by 1.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #340

Special notes for your reviewer:

Release note:


@kubernetes/kube-deploy-reviewers

This changes the logic from not counting machines that are being deleted
towards the machineset replica to counting them. The reason for the
change is that due to machine deletion taking non-trivial amount of
time, machine deployment rolling update may exceed the expected number
of machines utilized.

For example, for a machine set with 3 replicas and max surge 1, for a
max of 4 machines.
- create new machine in new machineset (4 machines)
- once new machine is ready, delete a machine from old machineset (4 machines, as machine is still being deleted)
- create new machine as deleted machine is not counted (5 machines)

For the duration of the old machine being deleted, we would exceed the
number of machines by 1.
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: k4leung4

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@k8s-ci-robot k8s-ci-robot added approved Indicates a PR has been approved by an approver from all required OWNERS files. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Jun 14, 2018
@k4leung4
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/assign @krousey @jessicaochen
/uncc @roberthbailey @medinatiger

@jessicaochen
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lgtm (leaving backslash for second reviewer)

@krousey
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krousey commented Jun 15, 2018

/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jun 15, 2018
@k8s-ci-robot k8s-ci-robot merged commit bfdc22a into kubernetes-sigs:master Jun 15, 2018
jayunit100 pushed a commit to jayunit100/cluster-api that referenced this pull request Jan 31, 2020
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Successfully merging this pull request may close these issues.

Machine deployment logic should continue counting machines that are being deleted
4 participants