hadoop checknative

hadoop classpath

hdfs dfsadmin -report


hdfs dfsadmin -safemode get

安全模式下只可进行读操作
hdfs fsck
# default队列
yarn queue -status default
# root队列
yarn queue -status root

yarn rmadmin -checkHealth rm1
yarn rmadmin -checkHealth rm2
yarn node -list -all

yarn jar ${HADOOP_HOME}/share/hadoop/mapreduce/hadoop-mapreduce-examples-3.2.3.jar pi 1 1
