Murmur2Partitioner

[DrNickBailey]

Since upgrading to 2.0.0 I'm now getting an import error:

---> from kafka.partitioner import Murmur2Partitioner
ImportError: cannot import name 'Murmur2Partitioner'

[jeffwidman]

The murmur2 partitioner has always been the default for the KafkaConsumer: https://github.com/dpkp/kafka-python/blob/2.0.0/kafka/partitioner/default.py

The old SimpleConsumer which could explicitly use the named import Murmur2Partitioner was removed in #1193 which was released in 2.0.0.

You can still import the murmur2 function that backed both the Murmur2Partitioner and KafkaConsumer's DefaultPartitioner from here: https://github.com/dpkp/kafka-python/blob/2.0.0/kafka/partitioner/__init__.py.

Depending on your use case, you may find it helpful to read the diff of #1193 for how it changed the partitioning logic imports in order to figure out whether you can just update the name or if you need to wrap it in some way if you have some very custom use case.