It all depends on exactly what operations you’re doing… Please share a
minimised reproducer so we could advice.
Error handling works as documented and is “forward propagated” through a
stream, and operators are free to handle it in any way they want.

—
Konrad `kto.so` Malawski
Akka <http://akka.io> @ Lightbend <http://lightbend.com>

On 20 September 2017 at 11:49:58, Bwmat ([email protected]) wrote:

I'm doing a PoC in akka streams, and I just had to track down a case where
the mapping functor in an instance of Flow.map() threw an exception. This
seems to simply close the stream, but _not_ report it anywhere. Other
stages were getting completed implicitly because of it, but the error
didn't seem to propagate.

The end of my graph was a SinkQueueWithCancel created with Sink.queue(),
and I had a thread blocked in a call to
sinkQueue.pull().toCompletableFuture().get(). I would have expected the
graph's failure to cause this to throw?

Also, I had logging set up as described in
https://groups.google.com/forum/#!topic/akka-user/rJHu7C8D3KQ , but I
didn't see any messages about an uncaught exception, which I would have
expected. (makes me think even more that I messed up the configuration
somehow?)

Thanks,
Matthew w.
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