简介:学习hadoop新手易犯错误:Call From master.hadoop/192.168.31.149 to master.hadoop:8020 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused 产生此错误的原因是hadoop集群未开启。 开启hadoop集群命令: start-all.sh ...
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1762) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2211) at org.apache.hadoop.ipc.Client.call(Client.java:1476) at org.apache.hadoop.ipc.Client.call(Client.java:1413) at org.apache.hadoop.ipc.ProtobufRpc...