User Commands Commands useful for users of a hadoop cluster. classpath Usage: hdfs classpath Prints the class path needed to get the Hadoop jar and the required libraries dfs Usage: hdfs dfs [COMMAND [COMMAND_OPTIONS]] Run a filesystem command on the file system supported in Hadoop. The va...
debug run a Debug Admin to execute HDFS debug commands dfsadmin run a DFS admin client dfsrouteradmin manage Router-based federation ec run a HDFS ErasureCoding CLI fsck run a DFS filesystem checking utility haadmin run a DFS HA admin client jmxget get JMX exported values from NameNode or ...
fileSystem.copyToLocalFile(false,newPath("/2.txt"),newPath("D:\\test\\2.download.txt"),true); fileSystem.close(); } 参考: HDFS文件管理:http://hadoop.apache.org/docs/r2.6.5/hadoop-project-dist/hadoop-hdfs/HDFSCommands.html API文档:https://hadoop.apache.org/docs/r2.8.2/api/index.ht...
Most commands print help when invoked w/o parameters. 二、hdfs与dfs结合使用的参数信息 [root@master ~]# hdfs dfs Usage: hadoop fs [generic options] [-appendToFile <localsrc> ... <dst>] [-cat [-ignoreCrc] <src>...] [-checksum <src>...] [-chgrp [-R] GROUP PATH...] [-chmod...
When data is brought into HDFS, it’s broken into blocks and distributed to different nodes in a cluster. With the data stored in multiple DataNodes, the blocks can be replicated to other nodes to enable parallel processing. The distributed file system (DFS) includes commands to quickly access...
Client Commands: classpath prints the class path needed to get the hadoop jar and the required libraries dfs run a filesystem command on the file system envvars display computed Hadoop environment variables fetchdt fetch a delegation token from the NameNode ...
Admin Commands Client Commands Daemon Commands 不同版本的Hadoop命令还是有差异的,具体会在后面新的文章中总结。 $ hadoop dfsadmin WARNING: Use of this script to execute dfsadmin is deprecated. WARNING: Attempting to execute replacement "hdfs dfsadmin" instead. ...
name displays more detailed help for a command. These commands support most of the normal files system operations like copying files, changing file permissions, etc. It also supports a few HDFS specific operations like changing replication of files. For more information see File System Shell Guide...
In the hadoop.security.auth_to_local HDFS service configuration file, add RULE:[1:$1@$0](.*\@AD.COM)s/\@.*//.On the domain controller:Run the following Ksetup commands to add a realm entry: Windows Command Prompt Copy C:> Ksetup /addkdc REALM.COM <your_kdc_server_address> C:...
Hadoop是Apache软件基金会下一个开源分布式计算平台,以HDFS(Hadoop Distributed File System)、MapReduce(Hadoop2.0加入了YARN,Yarn是资源调度框架,能够细粒度的管理和调度任务,还能够支持其他的计算框架,比如spark)为核心的Hadoop为用户提供了系统底层细节透明的分布式基础架构。hdfs的高容错性、高伸缩性、高效性等优点让用...