[TEP-0135] Update Affinity Assistant documentation #6892

QuanZhang-William · 2023-06-30T14:14:14Z

Part of #6740. This commit updates the Affinity Assistant related documentation to reflect recent changes in the Affinity Assistant modes. This commit also adds a chart summarizing how to configure the Affinity Assistant modes using coschedule and disabled-affinity-assistant feature flags.

/kind documentation

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docs/workspaces.md

config/config-feature-flags.yaml

QuanZhang-William · 2023-06-30T18:21:10Z

docs/affinityassistants.md

+<!--
+---
+linkTitle: "Affinity Assistants"
+weight: 405


I'm not sure why do we need it 😂

docs/affinityassistants.md

lbernick · 2023-06-30T18:34:42Z

docs/affinityassistants.md

+
+**Note:** For users who previously accepting default behavior (enabling affinity assistant) but now want one of the new features, you need to set `disable-affinity-assistant` to "true" and then turn on the new behavior by setting `coschedule` flag. For users who previously disabling the affinity assistant but want one of the new features, just set the `coschedule` flag accordingly.
+
+**Note:** **DO NOT** change the default value of the `coschedule` feature flag since the feature is work in progress and not yet functional. Please **ONLY** toggle the `disabled-affinity-assistant` feature flag to switch between **"disabled"** and **"coschedule workspace"** modes.


coscheduling = disabled is OK right?

Yeah this is fine. And disable-affinity-assistant : true and coschedule: workspaces will also disabled AA during migration. I put it here just for simplicity as this feature will be completed soon and this note will be removed.

docs/affinityassistants.md

wlynch · 2023-07-05T14:55:20Z

docs/affinityassistants.md

+* **coschedule pipelineruns (WIP)** - All `TaskRun` pods within the `PipelineRun` will be scheduled to the same Node.
+
+* **isolate PipelineRun (WIP)** - All `TaskRun` pods within the `PipelineRun` will be scheduled to the same Node,
+and only one PipelineRun is allowed to run on a node at a time.


If this functionality isn't available yet, perhaps comment this out for now?

(this gets published as user facing documentation on tekton.dev)

If this is meant to be more contributor focused, consider moving this to a README in the corresponding package or godoc.

The implementation for this feature is about to be completed. Maybe we can merge this PR after the feature is fully supported and update this section.

/hold

wlynch · 2023-07-05T15:01:55Z

docs/affinityassistants.md

+This means that Affinity Assistant is incompatible with e.g. other affinity rules
+ configured for the `TaskRun` pods. If the `PipelineRun` has a custom
+[PodTemplate](pipelineruns.md#specifying-a-pod-template) configured, the `NodeSelector` and `Tolerations` fields
+will also be set on the Affinity Assistant pod. The Affinity Assistant
+is deleted when the `PipelineRun` is completed. 


"Incompatible" is a bit ambiguous here - could you explain this a bit more?

Typically when I think of incompatibility I expect either an error to be returned or one field to take precedence over the other. But in this case it doesn't sound like either is what happens, and Affinity Assistants do coexist with PodTemplates? (though I could be misunderstanding something)

I have added some explanation for it, Affinity term in PodTemplate will be overwritten by Affinity Assistant if specified:

https://github.com/tektoncd/pipeline/blob/4f6c74a33b59d2bfc5d5ee14e2a9aa67d74b22f9/pkg/reconciler/taskrun/taskrun.go#L752C1-L756C3

wlynch · 2023-07-05T15:03:40Z

docs/affinityassistants.md

+
+The following chart summarizes the Affinity Assistant Modes with different combinations of the `disable-affinity-assistant` and `coschedule` feature flags during migration (when both feature flags are present) and after the migration (when only the `coschedule` flag is present).
+
+**Note:** For users who previously accepted the default behavior (enabling affinity assistant) but now want one of the new features, you need to set `disable-affinity-assistant` to "true" and then turn on the new behavior by setting the `coschedule` flag. For users who previously disabled the affinity assistant but want one of the new features, just set the `coschedule` flag accordingly.


How can I figure out if I previously accepted the default behavior?

I have update this part to show the default configmap setting explicitly!

wlynch · 2023-07-05T15:07:15Z

docs/affinityassistants.md

+
+The following chart summarizes the Affinity Assistant Modes with different combinations of the `disable-affinity-assistant` and `coschedule` feature flags during migration (when both feature flags are present) and after the migration (when only the `coschedule` flag is present).
+
+**Note:** For users who previously accepted the default behavior (enabling affinity assistant) but now want one of the new features, you need to set `disable-affinity-assistant` to "true" and then turn on the new behavior by setting the `coschedule` flag. For users who previously disabled the affinity assistant but want one of the new features, just set the `coschedule` flag accordingly.


Side note: it's a bit confusing that to turn on the coscheduling affinity assistant feature, you need to set disable-affinity-assistant=true - the flag names seem to conflict each other. idk if it's too late for this, but you may want to look into renaming these flags.

Hi @wlynch. Yeah, there was quite a long discussion about the naming, default value and how to make the migration less confusing to users while maintaining backward compatibility: tektoncd/community#1025 (comment) and tektoncd/community#1031.

Based on the discussion, it appeared that turning disable-affinity-assistant on or off to honour coschedule is quite personal. This feature is added as an alpha feature, I think we can collect more user feedback before promoting it to beta.

wlynch · 2023-07-05T15:12:39Z

docs/affinityassistants.md

+
+**Note:** For users who previously accepted the default behavior (enabling affinity assistant) but now want one of the new features, you need to set `disable-affinity-assistant` to "true" and then turn on the new behavior by setting the `coschedule` flag. For users who previously disabled the affinity assistant but want one of the new features, just set the `coschedule` flag accordingly.
+
+**Note:** **DO NOT** change the default value of the `coschedule` feature flag since the feature is work in progress and not yet functional. Please **ONLY** toggle the `disabled-affinity-assistant` feature flag to switch between **"disabled"** and **"coschedule workspace"** modes.


You may want to make this warning more prominent - moving this up to the top + ⚠️ / 🚨 emojis + bigger font / bold would help.

We should also try and classify all of these with their stability level to set expectations around breaking changes (by default users will assume stable).

Good point! Will add the stability levels for different mode!

Hi @wlynch. I have removed all the warnings and WIP in the documentation, and we will hold this PR until this feature is fully implemented (#6927 is merged).

I have also added the stability levels for the feature, including adding it to the alpha feature list. PTAL 😄

wlynch · 2023-07-05T15:15:12Z

docs/affinityassistants.md

+In the future, the `disable-affinity-assistant` feature flag will be deprecated, and the Affinity Assistant Modes will be only determined by 
+the `coschedule` feature flag. 
+
+The following chart summarizes the Affinity Assistant Modes with different combinations of the `disable-affinity-assistant` and `coschedule` feature flags during migration (when both feature flags are present) and after the migration (when only the `coschedule` flag is present).


This is the first mention of migration - when is this happening?

Added 9 month deprecation time to this part

wlynch · 2023-07-05T15:18:14Z

docs/affinityassistants.md

+
+**Note:** **DO NOT** change the default value of the `coschedule` feature flag since the feature is work in progress and not yet functional. Please **ONLY** toggle the `disabled-affinity-assistant` feature flag to switch between **"disabled"** and **"coschedule workspace"** modes.
+
+<table>


As a user / someone who isn't really familiar with this feature, I don't know what this table is supposed to be telling me 😅

Are these the config map values?

Yeah. I switched the order of the chart and the notes, so that the chart is now right below its explanations. PTAL

wlynch · 2023-07-05T15:21:20Z

docs/affinityassistants.md

+will also be set on the Affinity Assistant pod. The Affinity Assistant
+is deleted when the `PipelineRun` is completed. 
+
+Currently, the Affinity Assistant Modes can be configured by the `disable-affinity-assistant` and `coschedule` feature flags.


Might be worth including the expected config map values somewhere and how they map to the modes above.

Please see the above comment

Part of [tektoncd#6740][tektoncd#6740]. This commit updates the Affinity Assistant related documentation to reflect recent changes in the Affinity Assistant modes. This commit also adds a chart summarizing how to configure the Affinity Assistant modes using `coschedule` and `disabled-affinity-assistant` feature flags. /kind documentation [tektoncd#6740]: tektoncd#6740

vdemeester

/lgtm

tekton-robot · 2023-07-24T07:36:26Z

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QuanZhang-William · 2023-07-26T20:50:26Z

/hold cancel

#6927 is merged

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[TEP-0135] Coschedule per (Isolated) PipelineRun e2e support #6927

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TEP-0135: Coscheduling PipelineRun pods Implementation #6740

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[TEP-0135] Update Affinity Assistant documentation #6892

[TEP-0135] Update Affinity Assistant documentation #6892

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QuanZhang-William commented Jul 26, 2023


		Note: For users who previously accepting default behavior (enabling affinity assistant) but now want one of the new features, you need to set `disable-affinity-assistant` to "true" and then turn on the new behavior by setting `coschedule` flag. For users who previously disabling the affinity assistant but want one of the new features, just set the `coschedule` flag accordingly.

		Note: DO NOT change the default value of the `coschedule` feature flag since the feature is work in progress and not yet functional. Please ONLY toggle the `disabled-affinity-assistant` feature flag to switch between "disabled" and "coschedule workspace" modes.


		The following chart summarizes the Affinity Assistant Modes with different combinations of the `disable-affinity-assistant` and `coschedule` feature flags during migration (when both feature flags are present) and after the migration (when only the `coschedule` flag is present).

		Note: For users who previously accepted the default behavior (enabling affinity assistant) but now want one of the new features, you need to set `disable-affinity-assistant` to "true" and then turn on the new behavior by setting the `coschedule` flag. For users who previously disabled the affinity assistant but want one of the new features, just set the `coschedule` flag accordingly.


		Note: DO NOT change the default value of the `coschedule` feature flag since the feature is work in progress and not yet functional. Please ONLY toggle the `disabled-affinity-assistant` feature flag to switch between "disabled" and "coschedule workspace" modes.

		<table>

[TEP-0135] Update Affinity Assistant documentation #6892

[TEP-0135] Update Affinity Assistant documentation #6892

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QuanZhang-William commented Jun 30, 2023

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