implement distributed resizing #195

travisghansen · 2022-02-26T17:18:01Z

Signed-off-by: Travis Glenn Hansen travisghansen@yahoo.com

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add resizing support to distributed setups to compliement provisioner and snapshotter features of the same nature.

Added a parameter "--node-deployment" as a command line option for resizer sidecar, which should be set to true when the sidecar is being deployed on a per node basis.
For these changes to work, NODE_NAME environment variable must also be set while deploying the sidecar controller.

Which issue(s) this PR fixes:

Fixes #142

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Adds support for distributed resizing.

Signed-off-by: Travis Glenn Hansen <travisghansen@yahoo.com>

k8s-ci-robot · 2022-02-26T17:18:07Z

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k8s-ci-robot · 2022-02-26T17:18:08Z

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k8s-ci-robot · 2022-02-26T17:18:09Z

Hi @travisghansen. Thanks for your PR.

I'm waiting for a kubernetes-csi member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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Signed-off-by: Travis Glenn Hansen <travisghansen@yahoo.com>

xing-yang · 2022-02-28T13:18:34Z

/ok-to-test

pohly · 2022-03-01T16:25:23Z

cmd/csi-resizer/main.go

@@ -156,7 +171,8 @@ func main() {
 		*timeout,
 		kubeClient,
 		informerFactory,
-		driverName)
+		driverName,
+		*enableNodeDeployment)


There is one potential scalability problem here: if there are now as many resizers running in the cluster as there are nodes, then the apiserver has to keep all of them informed about PV and PVC updates.

external-provisioner has the same problem, but it cannot really be avoided there because support for immediate provisioning depends on all provisioners seeing a new PVC.

I'm just wondering whether something better can be done for the other sidecars. The code below already checks for the util.VolumeSelectedNodeKey label. It would be possible to set up the PVC informer so that it does server-side filtering. It's doable, I just don't have a code example at hand.

That leaves the PV, though. external-provisioner would have to be modified to set a similar (the same?) label there. Such a label may even be useful for the provisioner. This code here does client-side filtering of PVs:
https://github.com/kubernetes-csi/external-provisioner/blob/3b752c36ca71fbf5d7310bb6a568b93844062189/pkg/controller/controller.go#L1132-L1145

That could be replaced with server-side filtering.

Here is code which sets up an informer with server-side filtering:
https://github.com/kubernetes-csi/external-provisioner/blob/3b752c36ca71fbf5d7310bb6a568b93844062189/cmd/csi-provisioner/csi-provisioner.go#L452-L464

I thought about that as well but didn't want to 'kick against the pricks' as they say with how the others were implemented. I also noted that we are not currently doing server-side filtering on the driver either (which I found odd).

Given my limited golang skill set I would definitely need hand-holding on proper code to manage the watches/filters should we go that route.

k8s-triage-robot · 2022-05-30T17:20:17Z

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/lifecycle stale

travisghansen · 2022-05-30T17:33:09Z

/remove-lifecycle stale

mrpre · 2022-06-14T03:04:21Z

Any update about this pr? I patched it and it seems the resizer works well.

travisghansen · 2022-06-14T03:07:49Z

I haven’t had a chance to address the scalability concerns yet unfortunately. It should work fine for small clusters for sure.

k8s-triage-robot · 2022-09-12T04:02:12Z

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/lifecycle stale

travisghansen · 2022-09-12T04:04:47Z

/remove-lifecycle stale

b8kings0ga · 2022-10-20T10:30:13Z

wait to use this feature

k8s-triage-robot · 2023-01-18T10:47:18Z

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/lifecycle stale

travisghansen · 2023-01-18T15:01:14Z

/remove-lifecycle stale

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/lifecycle stale

travisghansen · 2023-04-18T21:16:38Z

/remove-lifecycle stale

k8s-triage-robot · 2023-07-17T21:51:35Z

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/lifecycle stale

travisghansen · 2023-07-18T03:08:56Z

/remove-lifecycle stale

k8s-ci-robot · 2023-10-02T17:55:46Z

@travisghansen: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-csi-external-resizer-1-27-on-kubernetes-1-27	`b3e94c3`	link	true	`/test pull-kubernetes-csi-external-resizer-1-27-on-kubernetes-1-27`

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k8s-ci-robot · 2023-11-02T02:34:06Z

PR needs rebase.

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k8s-triage-robot · 2024-01-31T03:28:10Z

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/lifecycle stale

travisghansen · 2024-02-03T05:02:36Z

/remove-lifecycle stale

k8s-triage-robot · 2024-05-03T05:05:46Z

The Kubernetes project currently lacks enough contributors to adequately respond to all PRs.

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/lifecycle stale

travisghansen · 2024-05-07T13:24:53Z

/remove-lifecycle stale

implement distributed resizing

91e6ac7

Signed-off-by: Travis Glenn Hansen <travisghansen@yahoo.com>

k8s-ci-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. kind/feature Categorizes issue or PR as related to a new feature. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Feb 26, 2022

k8s-ci-robot requested review from gnufied and humblec February 26, 2022 17:18

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travisghansen mentioned this pull request Feb 26, 2022

zfs-local (non ephemereal) a possibility (possibly a feature request) democratic-csi/democratic-csi#148

Open

readme typos

b3e94c3

Signed-off-by: Travis Glenn Hansen <travisghansen@yahoo.com>

k8s-ci-robot added ok-to-test Indicates a non-member PR verified by an org member that is safe to test. and removed needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. labels Feb 28, 2022

pohly reviewed Mar 1, 2022

View reviewed changes

travisghansen mentioned this pull request Mar 28, 2022

Consolidate and improve Nomad-related documentation democratic-csi/democratic-csi#168

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implement distributed resizing #195

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implement distributed resizing #195

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implement distributed resizing #195

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