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librdkafka v2.10.0 is a feature release:
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## [KIP-848](https://cwiki.apache.org/confluence/display/KAFKA/KIP-848%3A+The+Next+Generation+of+the+Consumer+Rebalance+Protocol) – Now in **Preview**
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- [KIP-848](https://cwiki.apache.org/confluence/display/KAFKA/KIP-848%3A+The+Next+Generation+of+the+Consumer+Rebalance+Protocol) has transitioned from *Early Access* to *Preview*.
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- Added support for **regex-based subscriptions**.
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- Implemented client-side member ID generation as per [KIP-1082](https://cwiki.apache.org/confluence/display/KAFKA/KIP-1082%3A+Require+Client-Generated+IDs+over+the+ConsumerGroupHeartbeat+RPC).
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- `rd_kafka_DescribeConsumerGroups()` now supports KIP-848-style `consumer` groups. Two new fields have been added:
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- **Group type** – Indicates whether the group is `classic` or `consumer`.
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- **Target assignment** – Applicable only to `consumer` protocol groups (defaults to `NULL`).
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- Group configuration is now supported in `AlterConfigs`, `IncrementalAlterConfigs`, and `DescribeConfigs`. ([#4939](https://github.com/confluentinc/librdkafka/pull/4939))
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- Added **Topic Authorization Error** support in the `ConsumerGroupHeartbeat` response.
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- Removed usage of the `partition.assignment.strategy` property for the `consumer` group protocol. An error will be raised if this is set with `group.protocol=consumer`.
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- Deprecated and disallowed the following properties for the `consumer` group protocol:
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- `session.timeout.ms`
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- `heartbeat.interval.ms`
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- `group.protocol.type`
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Attempting to set any of these will result in an error.
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- Enhanced handling for `subscribe()` and `unsubscribe()` edge cases.
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> [!Note]
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> The [KIP-848](https://cwiki.apache.org/confluence/display/KAFKA/KIP-848%3A+The+Next+Generation+of+the+Consumer+Rebalance+Protocol) consumer is currently in **Preview** and should not be used in production environments. Implementation is feature complete but contract could have minor changes before General Availability.
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## Enhancements and Fixes
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* Identify brokers only by broker id (#4557, @mfleming)
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* Remove unavailable brokers and their thread (#4557, @mfleming)
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* Commits during a cooperative incremental rebalance aren't causing
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leader change and offset validation (#4970).
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* Fix the Nagle algorithm (TCP_NODELAY) on broker sockets to not be enabled
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by default (#4986).
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* [KIP-848] `rd_kafka_DescribeConsumerGroups()` now supports KIP-848 introduced `consumer` groups. Two new fields for consumer group type and target assignment have also been added. Type defines whether this group is a `classic` or `consumer` group. Target assignment is only valid for the `consumer` protocol and its defaults to NULL. (#4922).
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* [KIP-848] Group Config is now supported in AlterConfigs, IncrementalAlterConfigs and DescribeConfigs. (#4939).
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## Fixes
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