Sun Nov 27 17:40:12 CST 2022 JAVA_HOME=/usr/java/jdk1.8.0_351-amd64 using /usr/java/jdk1.8.0_351-amd64 as JAVA_HOME using 6 as CDH_VERSION using /var/run/cloudera-scm-agent/process/84-hdfs-NAMENODE-createtmp as CONF_DIR using as SECURE_USER using as SECURE_GROUP CONF_DIR=/var/run/cloudera-scm-agent/process/84-hdfs-NAMENODE-createtmp CMF_CONF_DIR= unlimited 2022-11-27 17:40:25 WARN NativeCodeLoader:60 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Directory /tmp does not currently exist. 2022-11-27 17:40:27 WARN CreateHdfsDirUtil:377 - Connection failed 1 time(s). Trying again... org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /tmp. Name node is in safe mode. Resources are low on NN. Please add or free up more resourcesthen 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. NamenodeHostName:node141
PriviledgedActionException as:hdfs (auth:SIMPLE) cause:org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /tmp. Name node is in safe mode.
The reported blocks 0 has reached the threshold 0.9990 of total blocks 0. The number of live datanodes 0 needs an additional 1 live datanodes to reach the minimum number 1.
Safe mode will be turned off automatically once the thresholds have been reached.
删除： /data/dfs/nn 文件夹
退出安全模式：su – hdfs \ hadoop dfsadmin -safemode leave（“/sbin /nologin”，需要将其改成“/bin/bash”）
手动初始化NameNode：hdfs namenode -format
原文地址：http://www.cnblogs.com/panzhaohui/p/16930271.html
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