Exception on handling event causes SqlSubscription to stop without unsubscribing

[wpavelev]

Hello everyone.
We are having some issues with subscriptions using SQL Server eventstore. The error occurs when our EventHandler throws an exception. In our case it was a ServerTimeoutException for our ReadModel database.

To reproduce

• create a SqlServerAllStreamSubscription
• register an Eventhandler set options.ThrowOnError = true
• register an On method or override the HandleEvent method that should throw an exception
• add an event to the eventstore that should throw the exception
• in your log output you will see two entries:
  • Message handling failed at AsyncHandlingFilter for message ...
  • Message V1.MyMessage not acknowledged at ... Exception
• Add the same message another time or another message
• there are no additional logs showing the unsubscribe, re-subscribe or further message handling

Expected behaviour
There should be log entries showing the unsubscribe and re-subscribe and another attempt to handle the event

Additional context

There may be a problem on the ChannelWorker that provides the Channel.Read delegate and the ChannelWorkerBase with Task.Run(...). The exception does not seem to be passed to the next layer.

best regards

[linear]

EVE-194 Exception on handling event causes SqlSubscription to stop without unsubscribing