fix(stream): notify PartitionHub consumers on materializer shutdown#3347
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Motivation: When the materializer running a PartitionHub.sink is shut down (e.g. the hosting actor stops or crashes), consumers materialized on a different materializer may not be notified of the hub's termination. This mirrors the same bug pattern found in BroadcastHub (see #3345). Modification: Move registered-consumer notification from onUpstreamFailure to postStop so that postStop is the single notification point for all consumers. postStop now handles both Open (normal termination) and Closed (after upstream failure) states, ensuring registered consumers always receive the appropriate signal. Each callback invocation is wrapped in try/catch NonFatal so a single consumer failure does not short-circuit the notification loop. Result: PartitionHub consumers are reliably notified when the hub's materializer shuts down, preventing consumers from hanging indefinitely. Tests: - sbt "stream-tests / Test / testOnly org.apache.pekko.stream.scaladsl.HubSpec" References: Refs #3345
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Motivation
When the materializer running a
PartitionHub.sinkis shut down (e.g. the hosting actor stops or crashes), consumers materialized on a different materializer may not be notified of the hub's termination. This mirrors the same bug pattern found inBroadcastHub(see #3345).Modification
onUpstreamFailuretopostStopso thatpostStopis the single notification point for all consumers.postStopnow handles bothOpen(normal termination) andClosed(after upstream failure) states, ensuring registered consumers always receive the appropriate signal.Before:
onUpstreamFailurenotified registered consumers directly, butpostStopdid not. This left a gap where consumers could miss notification during materializer shutdown.After:
postStopis the sole notification point for registered consumers, using the failure reason from theClosedstate when applicable.Result
PartitionHub consumers are reliably notified when the hub's materializer shuts down, preventing consumers from hanging indefinitely.
Tests
sbt "stream-tests / Test / testOnly org.apache.pekko.stream.scaladsl.HubSpec"— 51 passed, 0 failed"notify consumers when hub materializer is shut down"(PartitionHub section)References
Refs #3345