v2021.10.21

This release cooperates with librdkafka v1.7.0

• Unify KafkaAsyncProducer & KafkaSyncProducer into KafkaProducer

  • New interface syncSend(...) for synchronous operation

• Unified KafkaAutoCommitConsumer & KafkaManualCommitConsumer into KafkaConsumer

• Refine the namespaces

  • Use lowercased namespace names

    • E.g. kafka, kafka::clients, kafka::utility, etc

  • New namespace kafka::clients for Kafka clients and related types

    • kafka::clients::KafkaProducer

    • kafka::clients::producer

      • Config

      • RecordMetadata

      • Callback

    • kafka::clients::KafkaConsumer

    • kafka::clients::consumer

      • Config

      • RebalanceCallback

      • OffsetCommitCallback

      • ConsumerGroupMetadata

      • UnorderedOffsetCommitQueue

    • kafka::clients::AdminClient

    • kafka::clients::admin

      • Config

      • CreateTopicsResult

      • DeleteTopicsResult

      • ListTopicsResult

      • DeleteRecordsResult

• New addon: KafkaRecoverableProducer

  • A wrapper over KafkaProducer, which would internally re-initialize the underlying producer for fatal errors