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Assign a partition during consumer rebalance: A partition is assigned to a consumer not subscribed to its topic · case 05

The partition rebalance operation is admitted even though a partition is assigned to a consumer not subscribed to its topic.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for assign a partition during consumer rebalance. The record r must satisfy all of: r['revocation_complete'] is True; r['assignment_epoch'][0] > r['assignment_epoch'][1]; r['checkpoint_available'] is not None; r['subscription_match'][0] in r['subscription_match'][1]; r['capacity_limit'][0]+r['capacity_limit'][1] <= r['capacity_limit'][2]. Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for queues. Each negative fixture violates exactly one invariant. No transport timing, persistence, cryptographic verification, or full protocol implementation is claimed.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
A partition is assigned to a consumer not subscribed to its topic	`true`	`false`	Failed

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