今天在写kafka的demo的时候遇到了一个很奇怪的问题。贴出报错
[2017-08-30 16:05:31,213] ERROR Closing socket for 127.0.0.1:9092-127.0.0.1:54794 because of error (kafka.network.Processor) kafka.network.InvalidRequestException: Error getting request for apiKey: 3 and apiVersion: 2 at kafka.network.RequestChannel$Request.liftedTree2$1(RequestChannel.scala:95) at kafka.network.RequestChannel$Request.<init>(RequestChannel.scala:87) at kafka.network.Processor$$anonfun$processCompletedReceives$1.apply(SocketServer.scala:488) at kafka.network.Processor$$anonfun$processCompletedReceives$1.apply(SocketServer.scala:483) at scala.collection.Iterator$class.foreach(Iterator.scala:893) at scala.collection.AbstractIterator.foreach(Iterator.scala:1336) at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) at scala.collection.AbstractIterable.foreach(Iterable.scala:54) at kafka.network.Processor.processCompletedReceives(SocketServer.scala:483) at kafka.network.Processor.run(SocketServer.scala:413) at java.lang.Thread.run(Thread.java:744) Caused by: java.lang.IllegalArgumentException: Invalid version for API key 3: 2 at org.apache.kafka.common.protocol.ProtoUtils.schemaFor(ProtoUtils.java:31) at org.apache.kafka.common.protocol.ProtoUtils.requestSchema(ProtoUtils.java:44) at org.apache.kafka.common.protocol.ProtoUtils.parseRequest(ProtoUtils.java:60) at org.apache.kafka.common.requests.MetadataRequest.parse(MetadataRequest.java:96) at org.apache.kafka.common.requests.AbstractRequest.getRequest(AbstractRequest.java:48) at kafka.network.RequestChannel$Request.liftedTree2$1(RequestChannel.scala:92) ... 10 more再把自己的代码和配置文件检查了一遍又一遍的时候，发现没有问题，但是问题出现在哪里呢？为什么会报错呢？于是把报错全部拿出来仔细看看，java.lang.IllegalArgumentException: Invalid version for API key 3: 2，猜到了可能是kafka的jar包版本不对。果断从kafka-clients-0.10.1.0.jar换成kafka-clients-0.10.2.0.jar。问题完美解决。
