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| --- | ||
| status: proposed | ||
| title: Custom Task SDK | ||
| creation-date: '2021-07-21' | ||
| last-updated: '2021-07-21' | ||
| authors: | ||
| - '@jerop' | ||
| - '@bobcatfish' | ||
| - '@Tomcli' | ||
| - '@ScrapCodes' | ||
| --- | ||
|
|
||
| # TEP-0077: Pipeline partial execution | ||
|
|
||
| <!-- toc --> | ||
| - [Summary](#summary) | ||
| - [Motivation](#motivation) | ||
| - [Goals](#goals) | ||
| - [Non-Goals](#non-goals) | ||
| - [Use Cases (optional)](#use-cases-optional) | ||
| - [Requirements](#requirements) | ||
| - [Proposal](#proposal) | ||
| - [Notes/Caveats (optional)](#notescaveats-optional) | ||
| - [Risks and Mitigations](#risks-and-mitigations) | ||
| - [User Experience (optional)](#user-experience-optional) | ||
| - [Performance (optional)](#performance-optional) | ||
| - [Design Details](#design-details) | ||
| - [Test Plan](#test-plan) | ||
| - [Design Evaluation](#design-evaluation) | ||
| - [Drawbacks](#drawbacks) | ||
| - [Alternatives](#alternatives) | ||
| - [Infrastructure Needed (optional)](#infrastructure-needed-optional) | ||
| - [Upgrade & Migration Strategy (optional)](#upgrade--migration-strategy-optional) | ||
| - [Implementation Pull request(s)](#implementation-pull-request-s) | ||
| - [References (optional)](#references-optional) | ||
| <!-- /toc --> | ||
|
|
||
| ## Summary | ||
|
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| Add an ability for `PipelineRun` to have disabled tasks i.e. a `PipelineRun` | ||
| can execute a `Pipeline` partially. | ||
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| Allow `PipelineRun` to be created from previous `PipelineRun`. | ||
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| So, a `PipelineRun` can be partially run or cancelled at run time, and | ||
| resumed at a later point with the help of work proposed in this TEP. | ||
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| Together these will bring in the ability to resume/retry a failed `PipelineRun` | ||
|
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| ## Motivation | ||
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| 1. A very long Pipeline may fail due to a transient failure, and the user may | ||
| want to only rerun the `Tasks` that failed. | ||
| 2. It is not enough to `retry` a `PipelineTask` n times, as the failures can | ||
| be due to e.g. service outage. A manual resume/ retry may be helpful. | ||
| 3. Iterate quickly, by disabling tasks that take longer time. This can be done | ||
| at run time, i.e. without editing pipeline definition. | ||
|
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| ### Goals | ||
|
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| - Partially execute a `Pipeline`, by disabling tasks. | ||
| - Resume a failed or cancelled `PipelineRun` from previous `PipelineRun`. | ||
| - Discuss how the results/workspaces of disabled tasks can be referenced or | ||
| populated from previous `PipelineRun`. | ||
|
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| ### Non-Goals | ||
|
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| - TBD. | ||
|
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| ### Use Cases (optional) | ||
|
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| <!-- | ||
| Describe the concrete improvement specific groups of users will see if the | ||
| Motivations in this doc result in a fix or feature. | ||
| Consider both the user's role (are they a Task author? Catalog Task user? | ||
| Cluster Admin? etc...) and experience (what workflows or actions are enhanced | ||
| if this problem is solved?). | ||
| --> | ||
|
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||
| ## Requirements | ||
|
|
||
| <!-- | ||
| Describe constraints on the solution that must be met. Examples might include | ||
| performance characteristics that must be met, specific edge cases that must | ||
| be handled, or user scenarios that will be affected and must be accomodated. | ||
| --> | ||
|
|
||
| ## Proposal | ||
|
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||
| <!-- | ||
| This is where we get down to the specifics of what the proposal actually is. | ||
| This should have enough detail that reviewers can understand exactly what | ||
| you're proposing, but should not include things like API designs or | ||
| implementation. The "Design Details" section below is for the real | ||
| nitty-gritty. | ||
| --> | ||
|
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| ### Notes/Caveats (optional) | ||
|
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||
| <!-- | ||
| What are the caveats to the proposal? | ||
| What are some important details that didn't come across above. | ||
| Go in to as much detail as necessary here. | ||
| This might be a good place to talk about core concepts and how they relate. | ||
| --> | ||
|
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| ### Risks and Mitigations | ||
|
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||
| <!-- | ||
| What are the risks of this proposal and how do we mitigate. Think broadly. | ||
| For example, consider both security and how this will impact the larger | ||
| kubernetes ecosystem. | ||
| How will security be reviewed and by whom? | ||
| How will UX be reviewed and by whom? | ||
| Consider including folks that also work outside the WGs or subproject. | ||
| --> | ||
|
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| ### User Experience (optional) | ||
|
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| <!-- | ||
| Consideration about the user experience. Depending on the area of change, | ||
| users may be task and pipeline editors, they may trigger task and pipeline | ||
| runs or they may be responsible for monitoring the execution of runs, | ||
| via CLI, dashboard or a monitoring system. | ||
| Consider including folks that also work on CLI and dashboard. | ||
| --> | ||
|
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| ### Performance (optional) | ||
|
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||
| <!-- | ||
| Consideration about performance. | ||
| What impact does this change have on the start-up time and execution time | ||
| of task and pipeline runs? What impact does it have on the resource footprint | ||
| of Tekton controllers as well as task and pipeline runs? | ||
| Consider which use cases are impacted by this change and what are their | ||
| performance requirements. | ||
| --> | ||
|
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| ## Design Details | ||
|
|
||
| <!-- | ||
| This section should contain enough information that the specifics of your | ||
| change are understandable. This may include API specs (though not always | ||
| required) or even code snippets. If there's any ambiguity about HOW your | ||
| proposal will be implemented, this is the place to discuss them. | ||
| If it's helpful to include workflow diagrams or any other related images, | ||
| add them under "/teps/images/". It's upto the TEP author to choose the name | ||
| of the file, but general guidance is to include at least TEP number in the | ||
| file name, for example, "/teps/images/NNNN-workflow.jpg". | ||
| --> | ||
|
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| ## Test Plan | ||
|
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||
| <!-- | ||
| **Note:** *Not required until targeted at a release.* | ||
| Consider the following in developing a test plan for this enhancement: | ||
| - Will there be e2e and integration tests, in addition to unit tests? | ||
| - How will it be tested in isolation vs with other components? | ||
| No need to outline all of the test cases, just the general strategy. Anything | ||
| that would count as tricky in the implementation and anything particularly | ||
| challenging to test should be called out. | ||
| All code is expected to have adequate tests (eventually with coverage | ||
| expectations). | ||
| --> | ||
|
|
||
| ## Design Evaluation | ||
| <!-- | ||
| How does this proposal affect the reusability, simplicity, flexibility | ||
| and conformance of Tekton, as described in [design principles](https://github.com/tektoncd/community/blob/master/design-principles.md) | ||
| --> | ||
|
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| ## Drawbacks | ||
|
|
||
| <!-- | ||
| Why should this TEP _not_ be implemented? | ||
| --> | ||
|
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| ## Alternatives | ||
|
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||
| <!-- | ||
| What other approaches did you consider and why did you rule them out? These do | ||
| not need to be as detailed as the proposal, but should include enough | ||
| information to express the idea and why it was not acceptable. | ||
| --> | ||
|
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| ## Infrastructure Needed (optional) | ||
|
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||
| <!-- | ||
| Use this section if you need things from the project/SIG. Examples include a | ||
| new subproject, repos requested, github details. Listing these here allows a | ||
| SIG to get the process for these resources started right away. | ||
| --> | ||
|
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| ## Upgrade & Migration Strategy (optional) | ||
|
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||
| <!-- | ||
| Use this section to detail wether this feature needs an upgrade or | ||
| migration strategy. This is especially useful when we modify a | ||
| behavior or add a feature that may replace and deprecate a current one. | ||
| --> | ||
|
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| ## Implementation Pull request(s) | ||
|
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||
| <!-- | ||
| Once the TEP is ready to be marked as implemented, list down all the Github | ||
| Pull-request(s) merged. | ||
| Note: This section is exclusively for merged pull requests, for this TEP. | ||
| It will be a quick reference for those looking for implementation of this TEP. | ||
| --> | ||
|
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| ## References (optional) | ||
|
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| 1. [Google Doc: Disabling a Task in a Pipeline](https://docs.google.com/document/d/1rleshixafJy4n1CwFlfbAJuZjBL1PQSm3b0Q9s1B_T8/edit#heading=h.jz9jia3av6h1) | ||
| 2. [TEP-0065-rejected](https://github.com/tektoncd/community/pull/422) |
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