merlimat opened a new pull request #11843:
URL: https://github.com/apache/pulsar/pull/11843
### Motivation
In `MultiTopicsConsumer` we're doing a `receiveAsync()` operation to
transfer messages from the individual consumers into the shared queue, but
we're not handling the failure path of the returned `CompletableFuture`.
This future should in theory never fail, but it fail if there is some bug in
the code, as it was the case for #11824.
The main issue is that since we're not handle the future failure path, the
exception stack traces are completely hidden, making debugging such issues more
complicated.
### Modification
1. Print exception
2. Retry later, to give it a chance to unblock itself
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