hadoop file formats and compression

Linux system (I) file system, compression, packaging operation summary, linux PackagingPreface The current situation is that. Net is already open-source, and. Net Core is cross-platform. It can be seen that Microsoft is working hard, changing, making progress, and moving towards spring. Once upon a time, Microsoft was a god-oriented. Net practitioner. If you don't open your mind to open source and change yo

[Root @ localhost tmp] # tar-tf abc.tarAbc/Abc/passwdAbc/a. img[Root @ localhost tmp] # tar-xvf abc.tarAbc/Abc/passwdAbc/a. img Pack multiple files to 11.tar at the same time[Root @ localhost tmp] # tar-cvf 11.tar abc a. img dhcp-4.3.1.tar abc.tarAbc/Abc/passwdAbc/a. imgA. imgDhcp-4.3.1.tarAbc.tar[Root @ localhost tmp] # ls-lh-Rw-r --. 1 root 62 M Mar 27 16:33 11.tar Use gzip for compression during packaging: tar-czvf 1.tar.gz 1 where 1 can be a

to separate directories. Their tables are mapped to subdirectories and stored in the data warehouse directory. The data of each table is written to the example file (datafile1.txt) in Hive/HDFS ). Data can be separated by commas (,), or other formats, which can be configured using command line parameters. Learn more about the group design from this blog. The installation, configuration, and implementation

Code test environment: hadoop2.4 Application Scenario: this technique can be used to customize the output data format, including the display form, output path, and output file name of the output data. Hadoop's built-in output file formats include: 1) fileoutputformat 2) textoutputformat 3) sequencefileoutputformat 4) multipleoutputs 5) nulloutputformat 6) la

Use 3 machines to build HDFS fully distributed cluster 201 (NameNode), 202 (DataNode), 203 (DataNode)Overall architectureNameNode (192.168.1.201)DataNode (192.168.1.202,192.168.1.203)Secondarynamenode (192.168.1.202)1. Download the Hadoop package from the official website and upload it to the Linux systemHadoop-1.2.1.tar.gzExtractTAR-ZXVF hadoop-1.2.1.tar.gz Linux Server requires a JDK environmentBecause th

An article to be recommended today, published in the blog of Cloudera, a well-known cloud storage provider, provides a detailed and illustrated explanation of several typical file structures of Hadoop and their previous relationships. Nosqlfan will translate the main content as follows (if there are errors and omissions, please correct): 1.Hadoop ' s Sequencefile

taper script programs, can also be used to back up the system or selected files and subdirectories. The OpenLinux operating system can also use cron schedules to automatically archive files. Create a cpio File Cpio commands can import or copy files from tar or cpio files. Because the cpio command is compatible with the tar command, I will not detail how it works here. However, this command has some functions not available for tar commands, as sho

compute nodes and extract them to the app directory, and then create a link to the app directory in the current working directory,-mapper options specify app/ mapper.pl for mapper programs, the-reducer option specifies app/reducer.pl as reducer programs, which can read./dict/dict.txt files. When you pack locally, you go to the directory app instead of packaging it in the app's upper-level directory, or you can access the mapper.pl file via app/app/ma

From a simple perspective, the zip format will be a good choice, and Python's support for the ZIP format is simple and easy to use. 1) Simple Application If you only want to use python for compression and decompression, you don't need to repeat the document. Here we provide a simple usage for you to understand at a glance. Import zipfile F = zipfile.zipfile('filename.zip ', 'w', zipfile. zip_deflated) F.write('file1.txt ') F.write('file2.doc ') F.

The archive file is not a compressed file, but a compressed file can be an archive file. 14.3.1. Using the File Packager Red Hat Linux includes a graphical compression tool, "

Introduction to document packaging and compression experimentsThe use of Zip,rar,tar is described in the compression/decompression tools commonly used on Linux.One, file packaging and decompressionBefore you talk about the Unzip tool on Linux, it is important to understand the following commonly used compressed package file