[v26.1.x] transform: multi-produce failure wedge fix#30855
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WillemKauf merged 2 commits intoJun 20, 2026
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Signed-off-by: Anish Shenoy <anish@onechronos.com> (cherry picked from commit 638caa4)
`run_all_producers()` fanned out one producer loop per output via `ss::parallel_for_each()`, which captures the first exception but waits for every loop to finish before resolving. A producer loop only exits once its abort source fires, so when a single producer threw (e.g. a transient "not a leader for partition" during a leadership transfer) the surviving loops spun forever. parallel_for_each stayed pending, the exception was never observed, and state::errored never fired -- so the processor's reported state stayed stuck at running with no progress on the affected output until an external pause/resume. Single-output transforms were unaffected because `parallel_for_each()` over one element resolves exceptionally immediately. Drive the producer loops off a composite abort source that fires when either the processor stops (_as) or a producer fails (a local source). The first producer to fail records its exception and aborts the local source, which unwinds the sibling producer loops promptly; the captured exception is then rethrown so it is reported exactly once as state::errored, and the manager restarts the processor. Also updates the repro test from the previous commit to assert the failure is reported for any output count, and adds a regression test that fails a producer, restarts, and asserts a clean restart with no spurious second error. (cherry picked from commit 38526c5)
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CI test resultstest results on build#86049
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Backport of PR #30836