hadoop checknative # 检查native库
hadoop fsck / #检查状态

hadoop fs -rmr -skipTrash /tmp/* #删除tmp目录

hadoop fs -ls hdfs://127.0.0.1:38020/ #查看hdfs上面的文件

hdfs dfs -du -h /druid/segments #查看hdfs数据大小
hdfs dfs -rm -r /druid/segments/sdk_data_gran_minute/2019* #手动删除hdfs数据
hadoop fs -rmr /user/bonree/.Trash #清空回收站

启动resourcemanager
yarn-daemon.sh start resourcemanager
#查看resourcemanager状态
yarn rmadmin -getServiceState rm1
yarn rmadmin -getServiceState rm2

查看namenode状态
hdfs haadmin -getServiceState nn1
#切换namenode状态
hdfs haadmin -transitionToActive nn1
hdfs haadmin -transitionToActive —forceactive nn1 —forcemanual

安全模式
hadoop dfsadmin -safemode get