hadoop命令無法識別
阿新 • • 發佈:2019-02-08
在執行一段時間後,突然報出hadoop不識別指令的錯誤。因為曾正確使用過,觀察所在目錄已變化,考慮是環境變數JAVA_HOME的問題。
/etc/profile中JAVA_HOME變數已修改。
考慮到hadoop2.2.0官方文件提及其他變數,如下補充。
vim /etc/profile 在/etc/profile檔案的末尾加上以下配置 04 05 export HADOOP_DEV_HOME=/home/wyp/Downloads/hadoop/hadoop-2.2.0 06 export PATH=$PATH:$HADOOP_DEV_HOME/bin 07 export PATH=$PATH:$HADOOP_DEV_HOME/sbin 08 export HADOOP_MAPARED_HOME=${HADOOP_DEV_HOME} 09 export HADOOP_COMMON_HOME=${HADOOP_DEV_HOME} 10 export HADOOP_HDFS_HOME=${HADOOP_DEV_HOME} 11 export YARN_HOME=${HADOOP_DEV_HOME} 12 export HADOOP_CONF_DIR=${HADOOP_DEV_HOME}/etc/hadoop
結束後輸入hadoop,返回:
Usage: hadoop [--config confdir] COMMAND where COMMAND is one of: fs run a generic filesystem user client version print the version jar <jar> run a jar file checknative [-a|-h] check native hadoop and compression libraries availability distcp <srcurl> <desturl> copy file or directories recursively archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive classpath prints the class path needed to get the Hadoop jar and the required libraries daemonlog get/set the log level for each daemon or CLASSNAME run the class named CLASSNAME Most commands print help when invoked w/o parameters.
原因:由於對前提準備hdfs安裝,hadoop2.2.0未按照官方文件安裝配置,出現很多隱藏問題