delete file in hadoop

Shell script -- run hadoop on linux Terminal -- the java file is saved as test. sh. the java file is wc. java, [Note: it will be packaged into 1. jar, the main function class is wc, the input directory address on hdfs is input, and the output directory address on hdfs is output. [note: The input directory and output directory are not... shell script -- run

FSO file (file) object properties DateCreated returns the date and time the folder was created Datelastaccessed returns the date and time the file was last accessed DateLastModified returns the date and time the file was last modified Drive returns the Drive object of the drive where the

transferred from: http://blog.csdn.net/lifuxiangcaohui/article/details/40588929Hive is based on the Hadoop distributed File system, and its data is stored in a Hadoop Distributed file system. Hive itself does not have a specific data storage format and does not index the data, only the column separators and row separat

. Look at the submit job script, which is also important: #!/bin/bash export hadoop_home=/home/q/hadoop-2.2.0 sudo-u flightdev HADOOP jar $HADOOP _home/share/hadoop/ Tools/lib/hadoop-streaming-2.2.0.jar \ D-mapred.job.queue.name=queue1 \ D Stream.map.inpu

FSO File object attributes DateCreated returns the creation date and time of the folder. DateLastAccessed returns the date and time when the last file was accessed. DateLastModified returns the date and time when the last file was modified. Drive returns the Drive object of the Drive where the file is located. Name: Sp

Analysis of HDFS file writing principles in Hadoop Not to be prepared for the upcoming Big Data era. The following vernacular briefly records what HDFS has done in Hadoop when storing files, provides some reference for future cluster troubleshooting. Enter the subject The process of creating a new file: Step 1: The cli

file Idnode in the Hadoop file system, where the file contains the file's modification time, access time, block size, and a file block information. The information contained in the folder includes the modification time, access control permissions, and so on. The edits

A simple test program for hadoop File compression and decompression: Package Org. myorg; import Java. io. *; import Org. apache. hadoop. conf. configuration; import Org. apache. hadoop. io. compress. compressioncodec; import Org. apache. hadoop. io. compress. compressionoutp

Hadoop has an abstract file system concept, and HDFs is just one of those implementations. The Java abstract class Org.apache.hadoop.fs.FileSystem shows a file system for Hadoop and has several implementations, as shown in table 3-1. File system Rr.Scheme

3rd Chapter HDFS: Distributed File System 3.5 HDFs Basic Command HDFs Order Official documents:http://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-hdfs/HDFSCommands.html 3.5.1 Usage [Root@node1 ~]# HDFs dfs usage:hadoop FS [generic options] [-appendtofile 3.5.2 HDFs Dfs-mkdir THE-P option behavior is much like Unix mkdir-p, creating parent direct

Official API link Address: http://hadoop.apache.org/docs/current/First, what is HDFs?HDFS (Hadoop Distributed File System): The universal Distributed File system above Hadoop, with high fault tolerance, high throughput features, and it is also at the heart of Hadoop.Ii. advantages and disadvantages of HadoopAdvantages:

#!/bin/bashread -p 'Please input the directory of hadoop , ex: /usr/hadoop :' hadoop_dirif [ -d $hadoop_dir ] ; then echo 'Yes , this directory exist.'else echo 'Error , this directory not exist.' exit 1fiif [ -f $hadoop_dir/conf/core-site.xml ];then echo "Now config the $hadoop_dir/conf/core-site.xml file." read -p 'Please input the ip value of fs.def

the test program again, run normally, and the client can view the file Lulu.txt in AA. Indicates the upload was successful, note that the owner here is Lujie, the local user name of the computerWorkaround Two:Set the arguments in the run configuration to change the user name to the user name of the Linux system HadoopWorkaround Three:Specify the user as Hadoop directly in the codeFileSystem fs = Filesystem

Concept: Sequencefile is a text storage file consisting of a binary serialized Key/value byte stream, which can be used during the input/output format of the map/reduce process. During the map/reduce process, the temporary output of map processing files is processed using Sequencefile. So the general Sequencefile are the original files generated in the filesystem for map invocation. 1.SequenceFile features: Is an important data

[Translated from mos] in unix/linux, how does one delete a shard by using a File descriptor (File Descriptors) to retrieve the deleted File (Data File or redo log )?Use File Descriptors in unix/linux to retrieve deleted files (Dat

ObjectiveWithin Hadoop, there are many types of file systems implemented, and of course the most used is his distributed file system, HDFs. However, this article does not talk about the master-slave architecture of HDFS, because these things are much more spoken on the internet and in the information books. So, I decided to take my personal learning, to say somet

Write more verbose, if you are eager to find the answer directly to see the bold part of the .... (PS: What is written here is all the content in the official document of the 2.5.2, the problem I encountered when I did it) When you execute a mapreduce job locally, you encounter the problem of No such file or directory, follow the steps in the official documentation: 1. Formatting Namenode Bin/hdfs Namenode-format 2. Start the Namenode and Datanod

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

Inkfish original, do not reprint commercial nature, reproduced please indicate the source (http://blog.csdn.net/inkfish). The default output of Hadoop is Textoutputformat, and the output file name is not customizable. Hadoop 0.19.X has a org.apache.hadoop.mapred.lib.MultipleOutputFormat that can output multiple files and can customize the filename, but from

/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