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ceae01d05b
The consumer group resumption flow in TestOffsetManagement occasionally fails with `read tcp ... i/o timeout` on the second consumer's first FetchMessage. Re-joining an existing group races with the previous member's LeaveGroup and session cleanup; the new reader can observe transient coordinator state that the kafka-go client surfaces as a connection read timeout. Wrap ConsumeWithGroup in a 3-attempt retry that rebuilds the reader only when no message was received yet, so a transient join failure doesn't fail the whole test. Partial progress (at least one message consumed) still returns immediately, preserving the original error semantics for post-join failures.