如果是新搭的CDH 集群并使用默认的kudu设置, 使用spark /java 连接kudu时候，一般都会碰到此类异常。
程序：
val masteraddr = "kudumasterip:7051" //创建kudu的数据库链接 val client = new KuduClient.KuduClientBuilder(masteraddr).build //打开表 val table = client.openTable("impala::testdb.PERSON") 异常信息：
java.lang.RuntimeException: Could not deserialize the response, incompatible RPC? Error is: step
at org.apache.kudu.client.KuduRpc.readProtobuf(KuduRpc.java:383) at org.apache.kudu.client.Negotiator.parseSaslMsgResponse(Negotiator.java:282) at org.apache.kudu.client.Negotiator.handleResponse(Negotiator.java:235) at org.apache.kudu.client.Negotiator.messageReceived(Negotiator.java:229) at org.apache.kudu.client.shaded.org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) at org.apache.kudu.client.shaded.org.jboss.netty.handler.timeout.ReadTimeoutHandler.messageReceived(ReadTimeoutHandler.java:184) at org.apache.kudu.client.shaded.org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)解决方法：
在CDH 页面上设置kudu 高级配置项：
-rpc_encryption=disabled
-rpc_authentication=disabled-trusted_subnets=0.0.0.0/0