Correct message keys for async batching mode #329
Merged
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There're some possible changes relative to #325.
As create_message_set() method is called only from base Producer class and from _send_upstream(), I've changed it a little bit, so messages sent as a list of (msg, key) tuples. I've added some basic tests also.
Take a look please, probably it can be improved.
(This PR is squashed to the other branch #326.)