When a Node EventEmitter (e.g. node-redis) emits an "error" event with
no
listener attached, Node escalates it to process.on("uncaughtException")
in
the task worker. The worker reported the error via the
UNCAUGHT_EXCEPTION
IPC event but did not exit, and the supervisor-side handler in
taskRunProcess only logged the message at debug level — leaving the
run()
promise orphaned until maxDuration fired and producing empty attempts
(durationMs=0, costInCents=0).
The supervisor now rejects the in-flight attempt with an
UncaughtExceptionError and gracefully terminates the worker (preserving
the OTEL flush window) on UNCAUGHT_EXCEPTION. The attempt fails fast
with
TASK_EXECUTION_FAILED, surfacing the original error name, message, and
stack trace, and falls under the normal retry policy. This mirrors the
existing indexing-side behavior in indexWorkerManifest. Apply the same
handling to unhandled promise rejections, which Node already routes
through uncaughtException by default.
Matt Aitken
62e006617e