Help me see if the Hadoop cluster is successfully built and running, right

To make a JPS to glance at , See if there's any namenode and datanode process

You build hadoop colony , It should be jdk And configure environment variables , Type... On the command line jps, View the current process , Does the host contain namenode Process and datanode process , And whether the slave contains datanode The process of

jps look down then hadoop Just look at the log

jps Look at the master node and slave node Services ,
Log ,
Upload and download several files to hdfs, See if it works ,
stay yarn On the implementation hadoop Example program for , See if it works