hadoop - Hadoop start-all.sh错误

Question

基本上，当我使用./start-all.sh命令启动hadoop时，我遇到了一些问题。

我看过Hadoop cluster setup - java.net.ConnectException: Connection refused

和There are 0 datanode(s) running and no node(s) are excluded in this operation

当我运行./start-all.sh时，我得到

  WARNING: Attempting to start all Apache Hadoop daemons as snagaraj in 10 
  seconds.
  WARNING: This is not a recommended production deployment configuration.
  WARNING: Use CTRL-C to abort.
  Starting namenodes on [localhost]
  pdsh@greg: localhost: ssh exited with exit code 1
  Starting datanodes
  Starting secondary namenodes [greg.bcmdc.bcm.edu]
  Starting resourcemanager
  Starting nodemanagers

当我运行使用Hadoop / HDFS的python脚本时出现错误

  org.apache.hadoop.ipc.RemoteException(java.io.IOException): File 
  /user/data/...._COPYING_ could only be written to 0 of the 
  1 minReplication nodes. There are 0 datanode(s) running and 0 node(s) 
  are excluded in this operation.

我曾尝试使用hdfs namenode -format重新格式化namenode，但这无济于事。

我的xml文件上的配置似乎正确，并且我到JAVA_HOME的路径正确。我很高兴根据需要提供信息。

Answer 1

执行:在masternode或namenode服务器中的ssh localhost。

如果能够连接，则上述问题将得到解决。