Afkak

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* Fixed bug where Afkak would raise a KeyError when a commit failed
`BPSO-11306`
* Added `request_retry_max_attempts` parameter to Consumer objects
which allows the caller to configure the maximum number of attempts
the Consumer will make on any request to Kafka. `BPSO-10531`
NOTE: It defaults to zero which indicates the Consumer should retry
forever. *This is a behavior change*.
* If a user-initiated Commit operation is attempted while a commit is
ongoing (even a Consumer auto-initiated one), the new attempt will
fail with a OperationInProgress error which contains a deferred
which will fire when the previous Commit operation completes. This
deferred *should* be used to retry the Commit since the ongoing
operation may not include the latest offset at the time the second
operation was initiated.
* Fixed an error where Commit requests would only be retried once
before failing.
* Reduced the level of some log messages from ERROR to WARNING or
lower. `BPSO-11309`
* Added `update_cluster_hosts` method to allow retargeting Afkak
client in case all brokers are restarted on new IPs. `BPSO-3521`
* Fixed bug where Afkak would continue to try to contact brokers at IP
addresses they no longer listened on, or brokers which had been
removed from the cluster. `BPSO-6790`

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* message processor callback will recieve Consumer object
with which it was registered

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* Fixed bug where message keys weren't sent to Kafka
* Fixed bug where producer didn't retry metadata lookup
* Fixed hashing of keys in HashedPartitioner to use Murmur2, like Java
* Shuffle the broker list when sending broker-unaware requests
* Reduced Twisted runtime requirement to 13.2.0
* Consolidated tox configuration to one tox.ini file
* Added logo
* Cleanup of License, ReadMe, Makefile, etc.

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* Added Twisted as install requirement
* Readme augmented with better install instructions
* Handle testing properly without 'Snappy' installed

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* Working offset committing on 0.8.2.1
* Full coverage tests
* Examples for using producer & consumer

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* Large amount of rework of the base 'mumrah/kafka-python' to convert the APIs to async using Twisted