fix(txpipeline): keyless commands should take the slot of the keyed

[ndyakov]

There is the possibility that there are keyless commands that can be executed on any node/slot. This should make sure that we choose the slot for the keyed commands when there is a tx pipelien request.

[ndyakov]

@LINKIWI bringing this to your attention.

[LINKIWI]

@LINKIWI bringing this to your attention.

Thanks, good catch. Structurally this looks good to me. I can help run this patch through our internal correctness and performance test suite early next week.

[htemelski-redis]

Overall looks good. Maybe we can improve the performance and the readability a bit

[Copilot]

Pull Request Overview

This PR ensures that keyless commands in a transaction pipeline use the same slot as keyed commands by introducing a preferred random slot concept and filtering keyed commands for slot determination.

• Extend cmdSlot to accept a preferredRandomSlot and propagate it through the pipeline mapping logic
• Add slottedKeyedCommands helper to group keyed commands by slot
• Update tests to cover the preferred slot behavior and pipeline execution of keyless commands

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ring_test.go	Adjusted Process-hook tests to invoke Get instead of Ping and updated expectations
osscluster_test.go	Added a test to verify keyless commands in a pipeline don’t trigger ErrCrossSlot
osscluster.go	Refactored slot resolution: added preferredRandomSlot parameter and slottedKeyedCommands
internal_test.go	Added tests for new preferredRandomSlot behavior in cmdSlot
command.go	Introduced keylessCommands map and updated cmdFirstKeyPos to recognize keyless commands

Comments suppressed due to low confidence (1)

osscluster.go:1583

• [nitpick] The function name slottedKeyedCommands is a bit unclear. Consider renaming it to keyedCommandsBySlot to more directly convey that it returns a map of slot → keyed commands.

func (c *ClusterClient) slottedKeyedCommands(cmds []Cmder) map[int][]Cmder {