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@zetxqx zetxqx commented Oct 14, 2025

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add non streaming response to prefix cache, several points to pay attention:

  1. This is only for non-streaming response, streaming response will be added in a followup PR.
  2. The PR is based on Break PostResponse requestcontrol plugin into 3 separate plugins to add streamed request functionality #1661
  • Also changed the ResponseComplete to accept a *types.LLMResponse which has richer structure.
  1. The response will be concatenated to the previous request.
  2. The encoding of ChatCompletions messages for prefix caching is now standardized via MarshalMessagesToJSON to improve caching accuracy for multi-turn conversations.
  3. Currently only the first choice and the content will be prefix cached. (not role is added but could be a follow up)

Which issue(s) this PR fixes:

Fixes Partially #971

Does this PR introduce a user-facing change?:


@k8s-ci-robot k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label Oct 14, 2025
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[APPROVALNOTIFIER] This PR is NOT APPROVED

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@k8s-ci-robot k8s-ci-robot added needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. labels Oct 14, 2025
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@zetxqx zetxqx force-pushed the prefix-cache-resp branch from e21b3fe to 565a1ce Compare October 15, 2025 21:17
@zetxqx zetxqx force-pushed the prefix-cache-resp branch 2 times, most recently from a7ddc30 to 7476ad3 Compare October 16, 2025 05:00
@k8s-ci-robot k8s-ci-robot added size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. and removed needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. labels Oct 16, 2025
@zetxqx zetxqx force-pushed the prefix-cache-resp branch 3 times, most recently from e1f9e73 to eec941c Compare October 16, 2025 06:45
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zetxqx commented Oct 18, 2025

/assign @liu-cong

@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Oct 22, 2025
@zetxqx zetxqx force-pushed the prefix-cache-resp branch from eec941c to 824af68 Compare October 28, 2025 20:42
@k8s-ci-robot k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Oct 28, 2025
@zetxqx zetxqx force-pushed the prefix-cache-resp branch from 824af68 to 39ae663 Compare October 31, 2025 23:29
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4 participants