hadoop hdfs commands

I. Introduction to HDFS shell commands We all know that HDFS is a distributed file system for data access. HDFS operations are basic operations of the file system, such as file creation, modification, deletion, and modification permissions, folder creation, deletion, and renaming.

Test environment and system information $ Uname-Linux 10. **. **. 15 2.6.32-220.17.1.tb619.el6.x86 _ 64 #1 SMP Fri Jun 8 13: 48: 13cst 2012 x86_64 x86_64 x86_64 GNU/Linux HadoopAnd hbase version information: Hadoop-0.20.2-cdh3u4 Hbase-0.90-adh1u7.1 10. **. **. 12 NFS serverTo provide the NFS service. 10. **. **. 15Attach 10. **. **. 12 NFS shared directory as HDFS namenode Ganglia-5.rpm

Tags: mod file copy ima time LSP tab version Execute file cinSince HDFs is a distributed file system for accessing data, the operation of HDFs is the basic operation of the file system, such as file creation, modification, deletion, modification permissions, folder creation, deletion, renaming, etc. The operations command for HDFS is similar to the operation of t

://www.blogjava.net/hongjunli/archive/2007/08/15/137054.html troubleshoot viewing. class filesA typical Hadoop workflow generates data files (such as log files) elsewhere, and then copies them into HDFs, which is then processed by mapreduce, usually without directly reading an HDFs file, which is read by the MapReduce framework. and resolves it to a separate reco

Hadoop series HDFS (Distributed File System) installation and configurationEnvironment Introduction:IP node192.168.3.10 HDFS-Master192.168.3.11 hdfs-slave1192.168.3.12 hdfs-slave21. Add hosts to all machines192.168.3.10 HDFS-Maste

Hadoop Study Notes 0002 -- HDFS file OperationsDescription: Hadoop of HDFS file operations are often done in two ways, command-line mode and Javaapi Way. Mode one: Command line modeHadoop the file Operation command form is: Hadoop fs-cmd Description: cmd is the specific file

This article was posted on my blog We know that HDFs is a distributed file system for Hadoop, and since it is a file system, there will be at least the ability to manage files and folders, like our Windows operating system, to create, modify, delete, move, copy, modify permissions, and so on. Now let's look at how Hadoop operates.Enter the

Http://www.cnblogs.com/sxt-zkys/archive/2017/07/24/7229857.html Hadoop's HDFs Copyright Notice: This article is Yunshuxueyuan original article.If you want to reprint please indicate the source: http://www.cnblogs.com/sxt-zkys/QQ Technology Group: 299142667 HDFs Introduction HDFS (Hadoop Distributed File System)

The Hadoop Distributed File System (HDFS) is designed to be suitable for distributed file systems running on common hardware (commodity hardware). It has a lot in common with existing Distributed file systems. But at the same time, the difference between it and other distributed file systems is obvious. HDFs is a highly fault-tolerant system that is suitable for

text file to reduce storage space, but also need to support split, and compatible with the previous application (that is, the application does not need to modify) situation. 5.comparison of the characteristics of 4 compression formats compression Format Split native Compression ratio Speed whether Hadoop comes with Linux Commands if the original

1. Create a Directory [Grid@master ~]$ Hadoop fs-mkdir/test2. View a list of files [Grid@master ~]$ Hadoop fs-ls/ Found 3 items drwxr-xr-x -grid supergroup 0 2018-01-08 04:37/test d RWX------ -grid supergroup 0 2018-01-07 11:57/tmp drwxr-xr-x -grid supergroup 0 2018-01-07 11:46 /user3. Uploading files to HDFs #新建上传目录 [Grid@m

Preparatory work: 1, install the Hadoop; 2. Create a Helloworld.jar package, this article creates a jar package under the Linux shell: Writing Helloworld.java filespublic class HelloWorld{public static void Main (String []args) throws Exception{System.out.println ("Hello World");} } Javac Helloworld.java is compiled and gets Helloworld.classIn the catalogue CV MANIFEST.MF file:manifest-version:1.0CREATED-BY:JDK1.6.0_45 (Sun Microsystems Inc.)Main-cl

Original link: http://blog.itpub.net/30089851/viewspace-2136429/1. Log in to the NN machine, go to the Namenode Configuration folder of the latest serial number, view the log4j configuration of the current NN[Email protected] ~]# cd/var/run/cloudera-scm-agent/process/[Email protected] process]# LS-LRT.....................Drwxr-x--x 3 HDFs HDFs 380 Mar 20:40 372-hdfs