语法: hadoop fs -cat URI [URI ...] 拷贝源路径到标准输出。 例子: hadoop fs -cat hdfs:///file1 hdfs:///file2 hadoop fs -cat file:///file3 /user/hadoop/file4 返回代码:成功0错误1; checksum 语法: hadoop fs -checksum URI 返回文件的大小。 例子: hadoop fs -checksum hdfs:///file1 ...
hdfs dfs [COMMAND [COMMAND_OPTIONS]] hadoop 所支持的文件系统命令,其中COMMAND_OPTIONS可在File System Shell Guide查看。 hdfs dfs命令前缀与hadoop fs效果相同。 追加文件内容 -appendToFile <localsrc> ... <dst> 实例 hdfs dfs -appendToFile hdfs-site.xml /tmp/tests/test.txt 查看文件内容 -cat URI...
#copy a directory to thelocalfilesystemhadoop fs -copyToLocal s3a://bucket/datasets/#copy a file from the object store to the cluster filesystem.hadoop fs -get wasb://yourcontainer@youraccount.blob.core.windows.net/hello.txt /examples#printthe objecthadoop fs -cat wasb://yourcontainer@your...
第五章:HDFS 一、操作HDFS 1、Web Console:端口50070 2、命令行:有两种类型 (1)普通操作命令: hdfs dfs *** 命令 -mkdir:在HDFS上创建目录 hdfs dfs -mkdir /aaa hdfs dfs -mkdir -p /bbb/ccc 如果父目录不存在,使用-p参数先创建父目录 -ls 查看HDFS的某个目录 -ls -R 查看HDFS的某个目录,包含子...
The general command line syntax is bin/hadoop command [genericOptions] [commandOptions] 4.获取完全命令信息 Usage: hadoop fs [generic options] [-appendToFile <localsrc> ... <dst>] [-cat [-ignoreCrc] <src> ...] [-checksum <src> ...] [-chgrp [-R] GROUP PATH...] [-chmod [-R...
localdomain6 192.168.1.10 KEL 192.168.1.99 KEL1 192.168.1.199 KEL2 [root@KEL hadoop]# cat slaves KEL KEL1 KEL2 当出现web端口访问不通的时候,查看防火墙是否关闭。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 [root@KEL hadoop]# systemctl status firewalld ● firewalld.service - firewall...
1.基本语法bin/hadoop fs 具体命令 OR bin/hdfs dfs 具体命令 dfs是fs的实现类。 2.命令大全[root@master ~]# hdfs dfs -help Usage: hadoop fs [generic options] [-appendToFile <localsrc> ... <dst…
cat /proc/mounts | grep -E "zk|ccdb"Copy the configuration file package. Log in to a management node as user fsadmin. Run the following command and enter the password of user root to switch to user root. su - root Run the following command to check whether configuration...
Returns 0 on success and 1 on error. 2、cat Usage:hdfs dfs -cat URI [URI ...] 查看内容. Example: hdfs dfs -cat hdfs://nn1.example.com/file1 hdfs://nn2.example.com/file2hdfs dfs -cat file:///file3 /user/hadoop/file4
cat /proc/mounts | grep -E "zk|ccdb"Copy the configuration file package. Log in to a management node as user fsadmin. Run the following command and enter the password of user root to switch to user root. su - root Run the following command to check whether configurat...