hdfs file formats

Recently, I am looking for an overall storage and analysis solution. We need to consider massive storage, analysis, and scalability. When I got to hadoop, I just started to position it to HDFS for storage. The more I see it, the more I get excited. First, perform the HDFS operation test.CodeThe complete eclipse + Tomcat project uses the Tomcat plug-in and hadoop 0.20.0 for massive

Lzo Lzo No No Lzop . Lzo 5 LZ4 ??? ?? ?? ??? ??? 6 Snappy ??? ?? ?? ??? ??? 7 ZLIB ??? ?? ?? ??? ??? 8 Zip DEFLATE Is Yes, within the scope of the file Zip . zip textfile text files, not compressed 1 2 3 4 5 6 7 8 --Create a table formatted as a text

In Linux, you can view the file encoding format and file encoding conversion. if you need to operate files in windows in Linux, you may frequently encounter file encoding conversion problems. In Windows, the default file format is GBK (gb2312), while Linux is generally a UTF-8. The following describes how to view the

1 make sure that eclipse has installed the hadoop-eclipse-plugin-1.0.2.jar plug-in 2. Select MAP/reduce in eclipse Right-click map/reduce locations and choose new hadoop locations. Note: The MAP/reduce port is the mapred-site.xml in the hadoop configuration file The port of the DFS master is in the core-site.xml in the hadoop configuration file After submission: The following results are displayed on th

Spring.xml configuration file contains other file formats xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/ Spring-beans.xsdHTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/aop/spring-aop.xsdHttp://www.springframework.org/schema/cache http://www.springframework.org/schema

First, overview:In a real-world production environment, you will typically encounter the need to pour logs from web servers such as Tomcat, Apache, etc. into HDFs for analysis. The way to configure this is to achieve the above requirements.Second, the configuration file:#agent1 nameagent1.sources=source1agent1.sinks=Sink1agent1.channels=channel1#spooling directory#set Source1agent1.sources.source1.type=Spoo

Java API reads a single HDFS File Single file on HDFS: -bash-3.2$ hadoop fs -ls /user/pms/ouyangyewei/data/input/combineorder/repeat_rec_categoryFound 1 items-rw-r--r-- 2 deploy supergroup 520 2014-08-14 17:03 /user/pms/ouyangyewei/data/input/combineorder/repeat_rec_category/repeatRecCategory.txtFile Content:

Label:The first is to install the MySQL database. Installation is complete using the sudo apt-get install mysql-server command. The table is then created and the data is inserted:Then download the Sqoop and the jar package that connects to the MySQL database. The next step is to install Sqoop. The first is to configure the sqoop-env.sh file:Then comment out the Config-sqoop file that does not need to be checked:The next step is to copy the Sqoop-1.4.4

/hadoop/l/hdfstest2.txt");//Create text Hdfstest2.txtFsdataoutputstream outputstream2=fs.create (InFile2); Fsdatainputstream inputStream1=fs.open (INFILE1);//Open Hdfstest1.txtOutputstream2.writeutf (Inputstream1.readutf ());//read Hdfstest1.txt content and write to Hdfstest2.txtOutputstream2.flush (); Outputstream2.close (); Inputstream1.close (); //Requirements 3Fsdatainputstream Inputstream2=fs.open (InFile2);//Open Hdfstest2.txtSystem. out. println (Inputstream2.readutf ());//Ou

size of a data Block, it does not occupy the space of the entire data Block. Write1), the Client initiates a file write request to the NameNode.2) according to the file size and file block configuration, NameNode returns the information of the DataNode managed by the Client.30. The Client divides the file into multipl

(Exception e) {E.printstacktrace ();}finally{Close StreamIoutils.closestream (instream);}}public static void Main (string[] args) throws Exception {String fileName = "/user/wangw/mapreduce/wordcount/wc.input";Read (fileName);Get filesystemFileSystem FileSystem = Getfilesystem ();Write pathString putfilename = "/user/wangw/put-wc.input";Path Writepath = new Path (putfilename);Output StreamFsdataoutputstream OutStream = filesystem.create (Writepath);File