[root@hadoop101.yinzhengjie.com~]# hdfs dfsadmin Usage: hdfs dfsadmin Note: Administrative commands can only be run as the HDFS superuser. [-report [-live] [-dead] [-decommissioning] [-enteringmaintenance] [-inmaintenance]] [-safemode <enter | leave | get |wait>] [-saveNamespace] [-...
(5) /test/chqz/input:传递给WordCount类,作为DFS文件系统的路径,指示输入数据来源。 (6) /test/chqz/output:传递给WordCount类,作为DFS文件系统的路径,指示输出数据路径。 hadoop推荐使用yarn jar替代hadoop jar 详情见:http://hadoop.apache.org/docs/r2.8.0/hadoop-yarn/hadoop-yarn-site/YarnCommands.html#...
hdfs dfs -mkdir /opt1 1. 图片 2.hdfs 的文件系统shell操作 hdfs dfs命令即为hdfs shell操作,具体的相关命令可以参看官网地址:https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/FileSystemShell.html 其实hdfs很多命令都跟linux中都命令一致,只是在hadoop中,需要加上hadoop fs -前缀,比如...
(5) /test/chqz/input:传递给WordCount类,作为DFS文件系统的路径,指示输入数据来源。 (6) /test/chqz/output:传递给WordCount类,作为DFS文件系统的路径,指示输出数据路径。 hadoop推荐使用yarn jar替代hadoop jar 详情见:http://hadoop.apache.org/docs/r2.8.0/hadoop-yarn/hadoop-yarn-site/YarnCommands.html#...
上接前两篇,再来分析下下载文件的过程hdfs dfs -get 或 hdfs dfs -copyToLocal 先找到命令get和copyToLocal对应的类 publicstaticvoidregisterCommands(CommandFactoryfactory){factory.registerCommands(AclCommands.class);factory.registerCommands(CopyCommands.class);factory.registerCommands(Count.class);factory.regist...
Note: Administrative commands can only be run as the HDFS superuser. [-report [-live] [-dead] [-decommissioning]] [-safemode <enter | leave | get | wait>] [-saveNamespace] [-rollEdits] [-restoreFailedStorage true|false|check]
用法:hdfs dfs [COMMAND [COMMAND_OPTIONS]] 在Hadoop支持的文件系统上运行filesystem命令,可以在File System Shell Guide中找到各种COMMAND_OPTIONS ,这个命令是日常中使用最多的命令之一。 envvars 用法:hdfs envvars 显示计算的Hadoop环境变量 fsck(使用率较高) ...
dfs.hosts, dfs.hosts.exclude configuration parameters.Hosts defined in dfs.hosts are the datanodes that are part of the cluster. If there are entries in dfs.hosts, only the hosts in it are allowed to register with the namenode.Entries in dfs.hosts.exclude are datanodes that need to be dec...
http://hadoop.apache.org/docs/r2.6.4/hadoop-project-dist/hadoop-hdfs/HDFSCommands.html 概述 所有的HDFS命令都包含在bin/hdfs 脚本里。直接无参数运行可以打印出所有命令的描述。 Usage: hdfs [--config confdir] [COMMAND] [GENERIC_OPTIONS] [COMMAND_OPTIONS] ...
发现hdfs dfsadmin -report存储指标和hdfs dfs -du -h /结果不一致,需要查看两张的统计逻辑的区别 确定命令的位置,which is hdfs [ops@m-onedata bin]$ which is hdfs /usr/bin/hdfs 查看脚本,cat /usr/bin/hdfs exec /usr/.../hadoop-hdfs/bin/hdfs.distro "$@" ...