java and hadoop

Under the Cd/home/hadoop/hadoop-2.5.2/binPerformed by the./hdfs Namenode-formatError[Email protected] bin]$/hdfs Namenode–format16/07/11 09:21:21 INFO Namenode. Namenode:startup_msg:/************************************************************Startup_msg:starting NameNodeStartup_msg:host = node1/192.168.8.11Startup_msg:args = [–format]Startup_msg:version = 2.5.2startup_msg: classpath =/usr/

locallyFileinputformat.setinputpaths (Job, "hdfs://master:9000/wcinput/"); Fileoutputformat.setoutputpath (Job, New Path ("hdfs://master:9000/wcoutput2/"));Note that this is to pull the HDFs file locally to run, if you observe the output, you will see the Jobid with the local wordAt the same time this operation is not required yarn (self-stop yarn service to do experiments)At the remote server executionConf.set ("Fs.defaultfs", "hdfs://master:9000/"); Conf.set ("Mapreduce.job.jar", "Target/wc.j

This article describes the configuration method for using the HDFs Java API.1, first solve the dependence, pomDependency> groupId>Org.apache.hadoopgroupId> Artifactid>Hadoop-clientArtifactid> version>2.7.2version> Scope>ProvidedScope> Dependency>2, configuration files, storage HDFs cluster configuration information, basically from Core-site.xml and Hdfs-sit

classes that are used by the entire jobJob.setjarbyclass (Wcrunner.class);Job.setmapperclass (Wcmapper.class);Job.setreducerclass (Wcreducer.class);Map output Data kv typeJob.setmapoutputkeyclass (Text.class);Job.setmapoutputvalueclass (Longwritable.class);Reduce output data kv typeJob.setoutputkeyclass (Text.class);Job.setoutputvalueclass (Longwritable.class);Path to execute input dataFileinputformat.setinputpaths (Job, New Path ("/wordcount/inpput"));Path to execute output dataFileoutputforma

Configuration file m103 Replace with the HDFs service address.To use the Java client to access the file on the HDFs, have to say is the configuration file Hadoop-0.20.2/conf/core-site.xml, originally I was here to eat a big loss, so I am not even hdfs, file can not be created, read. Configuration item: Hadoop.tmp.dir represents the directory location on the named node where the metadata resid

Running the Hadoop routine in Java error: Org.apache.hadoop.fs.LocalFileSystem cannot be cast to Org.apache. The code is as follows: PackageCom.pcitc.hadoop;Importjava.io.IOException;Importorg.apache.hadoop.conf.Configuration;ImportOrg.apache.hadoop.fs.FileSystem;ImportOrg.apache.hadoop.hdfs.DistributedFileSystem;ImportOrg.apache.hadoop.hdfs.protocol.DatanodeInfo;/*** Get all node names on the HDFs cluster

When connecting to a Hadoop cluster through the Java API, if the cluster supports HA mode, it can be set up to automatically switch to the active master node as follows. Wherein, clustername can be arbitrarily specified, with the cluster configuration independent, Dfs.ha.namenodes.ClusterName can also arbitrarily specify the name, there are several master write a few, followed by the corresponding settings

Big Data Architecture Development mining analysis Hadoop HBase Hive Storm Spark Flume ZooKeeper Kafka Redis MongoDB Java cloud computing machine learning video tutorial, flumekafkastorm Training big data architecture development, mining and analysis! From basic to advanced, one-on-one training! Full technical guidance! [Technical QQ: 2937765541] Get the big data video tutorial and training address Byt

The Hadoop installation in this article is based on the Hortonworks RPMs installation Documents See: Http://docs.hortonworks.com/CURRENT/index.htm Http://www.oracle.com/technetwork/java/javase/downloads/jdk-6u31-download-1501634.html Download Java jdk-6u31-linux-x64.bin #Java settings chmod U+x/home/jdk-6u31-linux

The client needs to specify the NS name, node configuration, Configuredfailoverproxyprovider and other information.code example:Package Cn.itacst.hadoop.hdfs;import Java.io.fileinputstream;import java.io.inputstream;import Java.io.outputstream;import Java.net.uri;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 classHdfs_ha { Public Static voidMain (string[] args) throws Exception {Conf

CD hadoop-2.4.1/lib/nativeFile libhadoop.so.1.0.0 to view your own version of HadoopView dependent libraries with the LDD commandLDD libhadoop.so.1.0.0LDD--version native version of GCChttp://blog.csdn.net/l1028386804/article/details/51538611Should be due to the GCC version of the problem, this will be compiled for a long time, so the solution is to comment out the log4j inside, or in the beginning of the installation of Linux after the upgrade and gl

to be closed manually, System.out is also an output stream, and if true, it will not output theIoutils.copybytes (in, System.out, 1024,false); In.close (); }Delete a file or folder/**Delete a file or folder * True: Indicates whether to delete recursively, if it is a file, here is True,false is indifferent, * folder must be true, otherwise error *@throwsurisyntaxexception*/ Public Static voidDelete ()throwsIOException, urisyntaxexception {FileSystem FileSystem=Getfilesystem (); BooleanisD

(Text.class); Job.setmapoutputvalueclass (Longwritable.class); Job.setreducerclass (Jreducer.class); Job.setoutputkeyclass (Text.class); Job.setoutputvalueclass ( Longwritable.class); Fileoutputformat.setoutputpath (Job, Outpath); Job.setoutputformat (textoutputformat.class);// Use Jobclient.runjob instead of job.waitForCompletionJobClient.runJob (job);}}Can seeIn fact, the old version of the API is not very different, just a few classes replaced itNote that the old version of the API class is

")); SYSTEM.OUT.PRINTLN (flag); @Test public void Testupload () throws IllegalArgumentException, ioexception{fsdataoutputstream out = FS . Create (New Path ("/words.txt")); FileInputStream in = new FileInputStream (New File ("E:/w.txt")); Ioutils.copybytes (in, out, 2048, true); public static void Main (string[] args) throws Exception {Configuration conf = new Configuration (); Conf.set ("Fs.defaultfs", "hdfs://123.206.xxx.xxx:9000"); Conf.set (

Tags: asi lsb one track ima mdk pos htm NTCThe Manatee tribe sent you 2018 New Year's greetings, the latest recorded "Big Data real-world enterprise Project video" 300 free download, including: Java Boutique course full video 204, Hadoop combat course full Video 58, MySQL full course 33 knots, Big Data Project video in section 5.Video Free Download Please click: Manatee Tribe-Download channel to download. O

Parameters required for configuration:Configuration conf = new Configuration();conf.set("fs.defaultFS", "hdfs://hadoop2cluster");conf.set("dfs.nameservices", "hadoop2cluster");conf.set("dfs.ha.namenodes.hadoop2cluster", "nn1,nn2");conf.set("dfs.namenode.rpc-address.hadoop2cluster.nn1", "10.0.1.165:8020");conf.set("dfs.namenode.rpc-address.hadoop2cluster.nn2", "10.0.1.166:8020");conf.set("dfs.client.failover.proxy.provider.hadoop2cluster", "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFai