I have the issue    Creating HDFS /tmp directory   Command (Create /tmp Directory (241)) has failed   --------- Mon Mar 12 16:22:02 +03 2018 Current working directory: /run/cloudera-scm-agent/process/115-hdfs-NAMENODE-createtmp Launching one-off process: /usr/lib64/cmf/service/hdfs/hdfs.sh mkdir /tmp hdfs supergroup 1777 Mon Mar 12 16:22:02 +03 2018 JAVA_HOME=/usr/java/jdk1.7.0_67-cloudera using /usr/java/jdk1.7.0_67-cloudera as JAVA_HOME using 5 as CDH_VERSION using /run/cloudera-scm-agent/process/115-hdfs-NAMENODE-createtmp as CONF_DIR using as SECURE_USER using as SECURE_GROUP CONF_DIR=/run/cloudera-scm-agent/process/115-hdfs-NAMENODE-createtmp CMF_CONF_DIR=/etc/cloudera-scm-agent unlimited 2018-03-12 15:22:04 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Directory /tmp does not currently exist. 2018-03-12 15:22:04 WARN CreateHdfsDirUtil:377 - Connection failed 1 time(s). Trying again... Directory /tmp does not currently exist. 2018-03-12 15:22:05 WARN CreateHdfsDirUtil:377 - Connection failed 2 time(s). Trying again... Directory /tmp does not currently exist. 2018-03-12 15:22:06 WARN CreateHdfsDirUtil:377 - Connection failed 3 time(s). Trying again... Directory /tmp does not currently exist. 2018-03-12 15:22:07 WARN CreateHdfsDirUtil:377 - Connection failed 4 time(s). Trying again... Directory /tmp does not currently exist. 2018-03-12 15:22:08 WARN CreateHdfsDirUtil:377 - Connection failed 5 time(s). Trying again... Directory /tmp does not currently exist. ----- There is enough space but gives error: 2:33:51.723 PM WARN NameNodeResourceChecker Space available on volume '/dev/mapper/centos_node1-root' is 0, which is below the configured reserved amount 104857600 2:33:51.723 PM WARN FSNamesystem NameNode low on available disk space. Already in safe mode. 2:33:51.724 PM INFO StateChange STATE* Safe mode is ONResources are low on NN. Please add or free up more resources then turn off safe mode manually. NOTE: If you turn off safe mode before adding resources, the NN will immediately return to safe mode. Use "hdfs dfsadmin -safemode leave" to turn safe mode off. 2:33:53.138 PM WARN UserGroupInformation PriviledgedActionException as:hdfs (auth:SIMPLE) cause:org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /tmp/.cloudera_health_monitoring_canary_files. Name node is in safe mode. Resources are low on NN. Please add or free up more resources then turn off safe mode manually. NOTE: If you turn off safe mode before adding resources, the NN will immediately return to safe mode. Use "hdfs dfsadmin -safemode leave" to turn safe mode off. 2:33:53.139 PM INFO Server IPC Server handler 8 on 8020, call org.apache.hadoop.hdfs.protocol.ClientProtocol.mkdirs from 10.0.0.1:52192 Call#447 Retry#0: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /tmp/.cloudera_health_monitoring_canary_files. Name node is in safe mode. Resources are low on NN. Please add or free up more resources then turn off safe mode manually. NOTE: If you turn off safe mode before adding resources, the NN will immediately return to safe mode. Use "hdfs dfsadmin -safemode leave" to turn safe mode off. ... View more