hadoop ls

Hadoop @ HADOOP :~ $ Mkdir ~ /File Create two txt files in the file Hadoop @ HADOOP :~ $ Cd file Hadoop @ HADOOP :~ /File $ echo "Hello World"> file1.txt Hadoop @

/hbase/ ? ? 4) synchronize the master and salve Scp-r/home/hadoop? Hadoop @ salve1:/home/hadoop? Scp-r/home/hadoop/hbase? Hadoop @ salve1:/home/hadoop? Scp-r/home/hadoop/zookeeper

/CompanyJoinAddress.java [[emailprotected] CompanyJoinAddress]$ ls bin/com/zonesion/tablejoin/* -la-rw-rw-r-- 1 hadoop hadoop 1909 8月 1 10:29 bin/com/zonesion/tablejoin/CompanyJoinAddress.class-rw-rw-r-- 1 hadoop hadoop 2199 8月 1 10:29 bin/com/zonesion/tablejoin/CompanyJo

:~$ echo "Hello" > Hello.txthwl@hadoop-master:~$ sudo-u HDFs Hadoop fs-mkdir/hwl14/05/11 19:31:52 INFO Security. Usergroupinformation:jaas Configuration already set up to Hadoop, not re-installing.hwl@hadoop-master:~$ sudo-u HDFs Hadoop fs-copyfromlocal HELLO.TXT/HWL14/05/11

Chapter 2 mapreduce IntroductionAn ideal part size is usually the size of an HDFS block. The execution node of the map task and the storage node of the input data are the same node, and the hadoop performance is optimal (Data Locality optimization, avoid data transmission over the network ). Mapreduce Process summary: reads a row of data from a file, map function processing, Return key-value pairs; the system sorts the map results. If there are multi

/CompanyJoinAddress.java [[emailprotected] CompanyJoinAddress]$ ls bin/com/zonesion/tablejoin/* -la-rw-rw-r-- 1 hadoop hadoop 1909 8月 1 10:29 bin/com/zonesion/tablejoin/CompanyJoinAddress.class-rw-rw-r-- 1 hadoop hadoop 2199 8月 1 10:29 bin/com/zonesion/tablejoin/CompanyJo

Protoc (requires compiling the specified compiled path./configure--prefix=/usr/app/protoc)Config/etc/profileMvn-v OKProtoc--version OK　　　　SVN download Source Compile HadoopMVN Package-dskiptests-pdist,native,docs-dtar (-dtar comes with generating a. Tar installation package)SVN checkout http://svn.apache.org/repos/asf/hadoop/common/trunk/(Hadoop trunk or/common/tags/x.x.x for oldVersionThe compiled storage

/home/large.zip testfile.zip Copy the local file large.zip to the root directory of HDFS/user/hadoop/. The file name is testfile.zip. view the existing files: [Hadoop @ hadoop1 hadoop] $ sbin/hadoop dfs-ls 9. hadoop online update

Feb 03:29 file2.txt-rw-rw-r--. 1 Hadoop hadoop 1048576 Feb 03:20 junk.data-rw-rw-r--. 1 Hadoop Hadoop 02:06 mul_bank.txt-rw-rw-r--. 1 Hadoop Hadoop 08:55 num.txtDrwxrwxr-x. 2 Hadoop

: hadoop DFS-ls HDFS file path 4. Know how to create a file copy in the HDFS File System: hadoop DFS-CP original file target file 5. Know how to delete a file in the HDFS File System: target file to be deleted by hadoop DFS-rm 6 What if I want to delete the file directory on HDFS? The file directory name on the

=/opt/lib64/hadoop-2.5.1Export PATH = $ HADOOP_HOME/bin: $ PATHExport CLASSPATH = $ HADOOP_HOME/lib: $ CLASSPATH Save (ESC,: wq) Oh, don't forget to run the source/etc/profile command on the terminal to make the modified profile take effect immediately. Then go to the etc/hadoop/(not the system's etc, but under hadoop) under

reads local data, while pseudo-distributed reads data on HDFS. To use HDFS, you must first create a user directory in HDFS:#./Bin/hdfs dfs-mkdir-p/user/hadoop#./Bin/hadoop fs-ls/user/hadoopFound 1 itemsDrwxr-xr-x-hadoop supergroup 0/user/hadoop/input Next. the xml file in/e

) View HDFs system[[emailprotected] ~] $ hadoop fs -ls /View the Hadoop HDFs file management system through Hadoop fs-ls/commands, as shown in the Linux file system directory. The results shown above indicate that the Hadoop stand

1. Hadoop Java APIThe main programming language for Hadoop is Java, so the Java API is the most basic external programming interface.2. Hadoop streaming1. OverviewIt is a toolkit designed to facilitate the writing of MapReduce programs for non-Java users.Hadoop streaming is a programming tool provided by Hadoop that al

Debian source list, it is not easy to use. The simplest way is to download Sun's JDK-> decompress-> modify java_home information. 1. Prepare the JDK file. This article describes how to copy files to the VM system through SSH. 2. Install JDK I installed it under/usr/lib/JVM/jdk1.7.0 _ 21 (this directory should be consistent in all servers, otherwise it would be a dead man ~) : Sudo tar xvf ~ /Downloads/javasjdk).tar.gz-C/usr/lib/JVM : CD/usr/lib/JVM :

.tar.gz-C/usr/gd/ Use ls/usr/gd/to view the extracted files. Create a soft link for jdk and hadoop in the/usr/gd directory. [Root @ gdy192ftpftp] # ln-s/usr/gd/jdk1.7.0 _ 07 // usr/gd/java [Root @ gdy192ftpftp] # ln-s/usr/gd/hadoop-0.20.2-cdh3u4 // usr/gd/hadoop [Root @ gdy192ftpftp] # ll/usr/gd/ Configure java and

.jarBin/hadoop jar hadoop-examples-1.1.2.jar grep input Output ' dfs[a-z. +CD output/Cat *1 dfsadminSet master to slave without password login:Server2:Su-hadoopSsh-keygenSsh-copy-id localhostSsh-copy-id 172.25.45.3Ssh-copy-id 172.25.45.4Cd/home/hadoop/hadoop/confVim Core-site.xml # #指定 NamenodeVim Mapred-site.xml # #指定

Mapred-site.xml Create a file in the directory, fill in the above content configuration Yarn-site.xml start Hadoop Execute First: Hadoop namenode-format Then start hdfs:start-dfs.sh, if the Mac computer shows localhost port 22:connect refused, need to set-share-tick telnet, allow access to that add current user. You will be asked to enter the password 3 times after executing start-dfs.sh. Then: start-

a source directory and a target file as input, and connects all files in the source directory to the local destination file. ADDNL is optional and is used to specify that a newline character be added at the end of each file. ls How to use: Hadoop fs-ls If it is a file, the file information is returned in the following format:File name If it is a directory,

. Example: Hadoop FS-Get/user/hadoop/file localfile Hadoop FS-Get HDFS: // host: Port/user/hadoop/file localfile Return Value: 0 is returned for success, and-1 is returned for failure. Getmerge Usage: hadoop FS-getmerge Accept a source directory and a target file as inp