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added group.instance.id to consumer group #2449

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added group.instance.id to consumer group #2449

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10 changes: 10 additions & 0 deletions kafka/consumer/group.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,15 @@ class KafkaConsumer(six.Iterator):
committing offsets. If None, auto-partition assignment (via
group coordinator) and offset commits are disabled.
Default: None
group_instance_id (str or None): A unique identifier of the consumer
instance provided by the end user. Only non-empty strings are permitted.
If set, the consumer is treated as a static member, which means that
only one instance with this ID is allowed in the consumer group at
any time. This can be used in combination with a larger session
timeout to avoid group rebalances caused by transient unavailability
(e.g. process restarts). If not set, the consumer will join the
group as a dynamic member, which is the traditional behavior.
Default: None
key_deserializer (callable): Any callable that takes a
raw message key and returns a deserialized key.
value_deserializer (callable): Any callable that takes a
Expand Down Expand Up @@ -254,6 +263,7 @@ class KafkaConsumer(six.Iterator):
'bootstrap_servers': 'localhost',
'client_id': 'kafka-python-' + __version__,
'group_id': None,
'group_instance_id': None,
'key_deserializer': None,
'value_deserializer': None,
'fetch_max_wait_ms': 500,
Expand Down