发行说明 - Kafka - 0.9.0.1版本
关于kafka0.9.0.1版本说明，只简单介绍一下新特性，具体如bug修复和改进等详情请自行查看。
子任务
[KAFKA-2058] - ProducerTest.testSendWithDeadBroker 瞬时故障
[KAFKA-2455] - 测试故障: kafka.consumer.MetricsTest > testMetricsLeak
[KAFKA-2655] - Consumer.poll(0)'s 开销太大
[KAFKA-2977] - Transient Failure in kafka.log.LogCleanerIntegrationTest.cleanerTest
[KAFKA-3103] - Transient Failure in kafka.integration.PlaintextTopicMetadataTest.testIsrAfterBrokerShutDownAndJoinsBack
Bug
[KAFKA-1862] - 时间对象传递到OffsetManager
[KAFKA-2143] - Replicas get ahead of leader and fail
[KAFKA-2478] - KafkaConsumer javadoc的例子是错的
[KAFKA-2578] - 客户端元数据应该是同步的
[KAFKA-2589] - 文档bug: "rebalance.backoff.ms" 默认值的属性是不正确的指定
[KAFKA-2676] - test中不正确的包名 (unit and integration prefix)
[KAFKA-2695] - Handle null string/bytes protocol primitives
[KAFKA-2752] - Add clean bounce system test for distributed Copycat
[KAFKA-2799] - WakupException thrown in the followup poll() could lead to data loss
[KAFKA-2877] - Messages sometimes not delivered by new consumer after Kafka restart
[KAFKA-2880] - Fetcher.getTopicMetadata NullPointerException when broker cannot be reached
[KAFKA-2893] - Add Negative Partition Seek Check
[KAFKA-2899] - Should log unexpected exceptions thrown when reading from local log
[KAFKA-2913] - GroupMetadataManager unloads all groups in removeGroupsForPartitions
[KAFKA-2926] - [MirrorMaker] InternalRebalancer calls wrong method of external rebalancer
[KAFKA-2936] - Socket server selector can stuck on one send in tight loop.
[KAFKA-2937] - Topics marked for delete in Zookeeper may become undeletable
[KAFKA-2938] - Socket server may throw IllegalStateException
更多内容查看：https://apache.opencas.org/kafka/0.9.0.0/RELEASE_NOTES.html
