如何正确更改kafka broker id
版本：kafka 0.9.0.0
操作：修改server.properties中的broker id
一般会得到如下错误：
[2018-08-26 00:41:54,540] ERROR Fatal error during KafkaServer startup. Prepare to shutdown (kafka.server.KafkaServer) kafka.common.InconsistentBrokerIdException: Configured broker.id 2 doesn't match stored broker.id 1 in meta.properties. If you moved your data, make sure your configured broker.id matches. If you intend to create a new broker, you should remove all data in your data directories (log.dirs). at kafka.server.KafkaServer.getBrokerIdAndOfflineDirs(KafkaServer.scala:670) at kafka.server.KafkaServer.startup(KafkaServer.scala:209) at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:38) at kafka.Kafka$.main(Kafka.scala:92) at kafka.Kafka.main(Kafka.scala) [2018-08-26 00:41:54,543] INFO shutting down (kafka.server.KafkaServer)
更正办法：手动修改meta.properties文件，在配置的log.dir下
vi /tmp/kafka-logs/meta.properties
So, 如果你想改kafka的broker id，比如第一遍写错了，应该遵循两个步骤：
1. 改server.prorperties文件配置；
2. 改meta.properties，默认情况下，应该在/tmp/kafka-logs目录下；
同时需注意数据存在多个目录时，需要修改多个目录的meta.propertie。
