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fix(helm-operator): do not send empty patch requests to kube apiserver #4957

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merged 3 commits into from
Jun 8, 2021

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chlam4
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@chlam4 chlam4 commented May 28, 2021

Description of the change:
This change is in the helm operator when generating patch requests during each reconcile cycle. The change filters out empty patches generated from the 3-way merge, which could be in the form of the "{}" byte array that represents an empty map. This byte array is neither nil or zero-length, so the release reconciler sees it as non-empty and sends out a patch request to the kube apiserver.

This addresses #4956.

Motivation for the change:
We have a deployment scenario with hundreds of helm operators, each generating ~60 empty patch requests even there are no changes. That caused heavy traffic onto the kube apiserver.

Testing done:

…ut of the 3-way merge.

Signed-off-by: Cheuk Lam <chlam4@hotmail.com>
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jsm84 commented Jun 1, 2021

/lgtm

@openshift-ci openshift-ci bot added the lgtm Indicates that a PR is ready to be merged. label Jun 1, 2021
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asmacdo commented Jun 7, 2021

looks reasonable to me, allowing the tests to run

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@chlam4 thanks for the bugfix. Can you add a changelog fragment? Then I'll approve.

…sts.

Signed-off-by: Cheuk Lam <chlam4@hotmail.com>
@openshift-ci openshift-ci bot removed the lgtm Indicates that a PR is ready to be merged. label Jun 7, 2021
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chlam4 commented Jun 7, 2021

Thanks @jsm84, @asmacdo and @estroz. @estroz, I've created a changelog fragment following one of the examples. Can you please take a look to see if it's ok?

@chlam4 chlam4 requested a review from estroz June 7, 2021 19:21
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/lgtm

@openshift-ci openshift-ci bot added the lgtm Indicates that a PR is ready to be merged. label Jun 7, 2021
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estroz commented Jun 7, 2021

/cherry-pick v1.8.x
/cherry-pick v1.7.x

@openshift-cherrypick-robot

@estroz: once the present PR merges, I will cherry-pick it on top of v1.8.x in a new PR and assign it to you.

In response to this:

/cherry-pick v1.8.x
/cherry-pick v1.7.x

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

Co-authored-by: Eric Stroczynski <estroczy@redhat.com>
Signed-off-by: Cheuk Lam <chlam4@hotmail.com>
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openshift-ci bot commented Jun 7, 2021

New changes are detected. LGTM label has been removed.

@openshift-ci openshift-ci bot removed the lgtm Indicates that a PR is ready to be merged. label Jun 7, 2021
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chlam4 commented Jun 7, 2021

@estroz I had to force push the last commit to fulfill the DCO sign-off requirement. Do you mind re-authorizing the workflows? Thanks in advance!

@estroz estroz changed the title Filtering out empty patch requests generated from the 3-way merge to avoid unnecessary load on kube apiserver fix(helm-operator): do not send empty patch requests to kube apiserver Jun 8, 2021
@estroz estroz merged commit ec26aad into operator-framework:master Jun 8, 2021
@openshift-cherrypick-robot

@estroz: new pull request created: #4971

In response to this:

/cherry-pick v1.8.x
/cherry-pick v1.7.x

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

@openshift-cherrypick-robot

@estroz: new pull request created: #4972

In response to this:

/cherry-pick v1.8.x
/cherry-pick v1.7.x

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

varshaprasad96 added a commit to varshaprasad96/helm-operator-plugins that referenced this pull request Dec 6, 2021
The change filters out empty patches generated from the 3-way merge,
which could be in the form of the "{}" byte array that
represents an empty map.

Reference: operator-framework/operator-sdk#4957
Co-authored-by: Cheuk Lam
varshaprasad96 added a commit to varshaprasad96/helm-operator-plugins that referenced this pull request Dec 6, 2021
The change filters out empty patches generated from the 3-way merge,
which could be in the form of the "{}" byte array that
represents an empty map.

Reference: operator-framework/operator-sdk#4957
Co-authored-by: Cheuk Lam
varshaprasad96 added a commit to operator-framework/helm-operator-plugins that referenced this pull request Dec 7, 2021
#139)

The change filters out empty patches generated from the 3-way merge,
which could be in the form of the "{}" byte array that
represents an empty map.

Reference: operator-framework/operator-sdk#4957
Co-authored-by: Cheuk Lam
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5 participants