一、写测试命令
hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-3.1.4-tests.jar TestDFSIO -write -nrFiles 10 -size 10MB
二、读测试命令
hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-3.1.4-tests.jar TestDFSIO -read -nrFiles 10