停止hadoop集群，运行命令
$ sh stop-all.sh
出现提示：
no resourcemanager to stop
host10: no nodemanager to stop
host9: no nodemanager to stop
no proxyserver to stop
添加日志重新操作：
export HADOOP_ROOT_LOGGER=DEBUG,console
18/11/13 11:07:16 DEBUG util.PerformanceAdvisory: Falling back to shell based
18/11/13 11:07:16 DEBUG security.JniBasedUnixGroupsMappingWithFallback: Group mapping impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping
18/11/13 11:07:16 DEBUG security.Groups: Group mapping impl=org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback; cacheTimeout=300000; warningDeltaMs=5000
18/11/13 11:07:16 DEBUG security.UserGroupInformation: hadoop login
18/11/13 11:07:16 DEBUG security.UserGroupInformation: hadoop login commit
18/11/13 11:07:16 DEBUG security.UserGroupInformation: using local user:UnixPrincipal: udap
18/11/13 11:07:16 DEBUG security.UserGroupInformation: Using user: "UnixPrincipal: udap" with name udap
18/11/13 11:07:16 DEBUG security.UserGroupInformation: User entry: "udap"
18/11/13 11:07:16 DEBUG security.UserGroupInformation: UGI loginUser:udap (auth:SIMPLE)
18/11/13 11:07:16 DEBUG security.UserGroupInformation: PrivilegedAction as:udap (auth:SIMPLE) from:org.apache.hadoop.hdfs.tools.GetConf.run(GetConf.java:314)
stopping yarn daemons
no resourcemanager to stop
host10: no nodemanager to stop
host9: no nodemanager to stop
no proxyserver to stop
没什么报错信息，这不科学，所以观察脚本，发现错误在寻找pid的时候没找到，默认pid存在：
if [ "$HADOOP_PID_DIR" = "" ]; then HADOOP_PID_DIR=/tmp fi
当tmp目录被删除时，此时就无法运行脚本停止进程，所以只能手动一台台停止进程了，如果要避免错误应该是启动脚本中将“HADOOP_PID_DIR”配置到不删除目录