@debian-master:~/spark-0.8.0-incubating-bin-hadoop1$ Vim Run-qiu-test
__________________
scala_version=2.9.3
# Figure out where the Scala framework is installed
Fwdir= "$ (CD ' dirname $ '; pwd)"
# Export this as Spark_home
Export Spark_home= "$FWDIR"
# Load environment variables from conf/spark-env.sh, if it exists
If [-e $FWDIR/conf/spark-env.sh]; Then
. $FWDIR/conf/spark-env.sh
Fi
If [-Z "$"]; Then
echo "Usage:run-example Exit 1
Fi
# Figure out of the JAR
Using Anaconda to install Python HDFs package Python-hdfs 2.1.0 PackageFrom HDFs Import *Import timeClient = Client ("http://192.168.56.101:50070")ll = client.list ('/home/test ', status=true)For I in LL: table_name = i[0] #表名 table_attr = i[1] #表的属性 #修改时间1528353247347, 13 bits to milliseconds, need to be converted to a timestamp of 10 bits to seconds (f
complete the unfinished part of the previous section, and then analyze the internal principle of the HDFs read-write file.Enumerating FilesThe Liststatus () method of the FileSystem (Org.apache.hadoop.fs.FileSystem) can list the contents of a directory.Public filestatus[] Liststatus (Path f) throws FileNotFoundException, Ioexception;public filestatus[] Liststatus (Path[] files) throws FileNotFoundException, Ioexception;public filestatus[] Liststatus (
Use this command bin/Hadoop fs-cat to read the file content on HDFS to the console.
You can also use HDFS APIs to read data. As follows:
Import java.net. URI;Import java. io. InputStream;Import org. apache. hadoop. conf. Configuration;Import org. apache. hadoop. fs. FileSystem;Import org. apache. hadoop. fs. Path;Import org. apache. hadoop. io. IOUtils;Public cla
Today, nothing to do, so the basic operation of HDFs with Java to write a simplified program to give you some small help! PackageCom.quanttech;Importorg.apache.hadoop.conf.Configuration;ImportOrg.apache.hadoop.fs.FileSystem;ImportOrg.apache.hadoop.fs.Path;/*** @topic HDFs file Operation Tool class *@authorZhouj **/ Public classHdfsutils {/** Determine if the
-ROM file system standardsIsp:x-internet Signature DocumentsIST: Digital Tracking device filesIsu:installshield Uninstall ScriptIT: Pulse Tracking System Music Module (MOD) fileITI: Pulse Tracking System equipmentIts: Pulse tracking system sampling, Internet document locationIv:open file formats used in inventorIVD: More than 20/20 microscopic data dimensions or
Comparison of the six most common prototype file formats and six prototype file formats
Internet product partners will not be unfamiliar with the term "prototype. Like "User Experience", it is often spoken by various people. Prototype is a way for users to experience products, exchange design ideas, and display compl
fs-count
Count the number of directories, the number of files, and the total size of files in the corresponding hdfs path.
Displayed as the number of directories, number of files, total file size, input path
10. du
Hadoop fs-du
Displays the size of each folder and file in the corresponding hdfs path.
Hadoop fs-du-s
use: Hadoop fs-rmr uri [uri ...]The recursive version of Delete.Example:
Hadoop Fs-rmr/user/hadoop/dir
Hadoop FS-RMR Hdfs://host:port/user/hadoop/dir
return value:Successful return 0, Failure returns-1.21:setrepHow to use: Hadoop Fs-setrep [-R] Change the copy factor of a file. The-r option is used to recursively change the copy factor for all files in the directory.Example:
Hado
Introduction
Prerequisites and Design Objectives
Hardware error
Streaming data access
Large data sets
A simple consistency model
"Mobile computing is more cost effective than moving data"
Portability between heterogeneous software and hardware platforms
Namenode and Datanode
File System namespace (namespace)
Data replication
Copy storage: One of the most starting steps
Cop
Important Navigation
Example 1: Accessing the HDFs file system using Java.net.URL
Example 2: Accessing the HDFs file system using filesystem
Example 3: Creating an HDFs Directory
Example 4: Removing the HDFs d
specified, the trash, if enabled, will be bypassed and the specified file (s) deleted immediately. this can be useful when it is necessary to delete files from an over-quota directory.Example:
Hadoop FS-RMR/user/hadoop/Dir
Hadoop FS-rmr hdfs: // nn.example.com/user/hadoop/dir
Exit code:
Returns 0 on success and-1 on error.
Setrep
Usage: hadoop FS-setrep [-R]
Changes the replication factor of a
1. Overview
A small file is a file with a size smaller than a block of HDFs. Such files can cause serious problems with the scalability and performance of Hadoop. First, in HDFs, any block, file or directory in memory is stored as objects, each object is about 150byte, if t
Hadoop Introduction: a distributed system infrastructure developed by the Apache Foundation. You can develop distributed programs without understanding the details of the distributed underlying layer. Make full use of the power of clusters for high-speed computing and storage. Hadoop implements a Distributed File System (HadoopDistributed File System), HDFS for s
A Profile
Hadoop Distributed File system, referred to as HDFs. is part of the Apache Hadoop core project. Suitable for Distributed file systems running on common hardware. The so-called universal hardware is a relatively inexpensive machine. There are generally no special requirements. HDFS provides high-throughput dat
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 fi
This is a major chat about Hadoop Distributed File System-hdfs
Outline:
1.HDFS Design Objectives
The Namenode and Datanode inside the 2.HDFS.
3. Two ways to operate HDFs 1.HDFS design target hardware error
Hardware errors are norm
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