ADR: hints process directive for executor-specific scheduling hints#6960
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ADR: hints process directive for executor-specific scheduling hints#6960
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Propose a generic 'hints' process directive with namespaced keys as the extension point for executor-specific scheduling hints. First use case: AWS Batch consumable resources for license-seat management. Evaluates three options: dedicated consumableResources directive, overloading resourceLabels, and a new hints directive. Recommends hints for extensibility and separation of concerns. Ref: #5917 Signed-off-by: Rob Syme <[email protected]>
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See also Kubernetes Node Selectors and Node Affinity which perform a similar function: https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/ Indeed, the exisitng nodeLabel method could be ported to this directive. |
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Other related tickets I know of:
This may provide useful context in terms of use cases. |
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Related: WDL requirements and hints |
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Summary
Architecture Decision Record proposing a new
hintsprocess directive with namespaced keys as a generic extension point for executor-specific scheduling hints.First use case: AWS Batch consumable resources for license-seat-aware scheduling.
Options Evaluated
consumableResourcesdirective — too narrow, each executor feature would need its own directiveresourceLabels— conflates metadata tags with scheduling behavior;resourceLabelsuses replacement semantics in config overrides, so a sysadmin's cost-tracking labels would be wiped out if a user sets consumable resources (and vice versa)hintsdirective (recommended) — generic, extensible, namespaced keys, executors consume what they understandProposed Syntax
Ref: #5917, #6957
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