setup hadoop cluster at home

Ø change/etc/hosts, add all cluster machine IP to host name mappings Ø copy Hadoop package hadoop.tar.gz to/usr/local Ømd5sum Check hadoop.tar.gz package: md5sum hadoop.tar.gz Ø Decompression hadoop.tar.gz Package: Tar-xzf hadoop.tar.gz Ø Change hadoop-1.0.3 directory permissions: Chown-r hadoop:hadoop hadoop-1.0.3

The main process for installing and setting up Hadoop under Ubuntu.1. Create a Hadoop userCreate a user named Hadoop and create the user's home directory under home without detailed description.2. Installing the Java EnvironmentDownload the jdk:jdk-8u111-linux-x64.tar.gz und

Setup function source code: (Excerpt from "Hadoop Combat")*called once at the start of the task.protected void Setup (context context) throws ioexception,interruptedexception{}As you can tell from the comments, the setup function is called when the task starts.Jobs in MapReduce are organized into Maptask and Reducetask

First run MapReduce, recorded several problems encountered, Hadoop cluster is CDH version, but my Windows local jar package is directly with hadoop2.6.0 version, and did not specifically look for CDH version of the1.Exception in thread "main" Java.lang.NullPointerException Atjava.lang.ProcessBuilder.startDownload Hadoop2 above version, in the Hadoop2 bin directory without Winutils.exe and Hadoop.dll, find t

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　　ObjectiveWhen you build a Hadoop cluster, the first time you format it, take a snapshot . Do not casually lack of any process, just a format.　　problem description : start Hadoop times NameNode uninitialized: Java.io.IOException:NameNode is notformatted.At the same time, if you start the Namenode alone, it will appear, after startup for a while, the situation of

/jobtoken at Org.apache.hadoop.security.Credentials.readTokenStorageFile (Credentials.java:135) at Org.apache.hadoop.mapreduce.security.TokenCache.loadTokens (tokencache.java:165) at org.apache.h Adoop.mapred.TaskTracker.initializeJob (tasktracker.java:1179) at Org.apache.hadoop.mapred.TaskTracker.localizeJob (tasktracker.java:1116) at org.apache.hadoop.mapred.tasktracker$ 5.run (tasktracker.java:2404) at Java.lang.Thread.run (thread.java:744) caused by:java.io.FileNotFoundException:File File:/

(string.valueof (Res.getint (1)) + " \ t "+ res.getstring (2) +" \ T " + res.getstring (3)); } //Regular hive query sql = "SELECT COUNT (1) from "+ tableName; SYSTEM.OUT.PRINTLN ("Running:" + sql); res = stmt.executequery (SQL); while (Res.next ()) { SYSTEM.OUT.PRINTLN (res.getstring (1)); } } }//------------End--------------------------------------------- Iv. Display of results Running:show Tables ' testhivedrivertable ' Testhivedrivertable Running:describe testhivedrive

/id_rsa.pub ~/.ssh/authorized_keys4) master native uses SSH localhost test:The first time you will be prompted whether "is you sure want to continue connecting (yes/no)?", enter Yes directly, the next time you enter SSH localhost will not be prompted.5) Modify the hosts for each node (MASTER,NODE1,NODE2,NODE3):Statistics add the following host list:The purpose is to use the SSH connection for the rear, without entering the IP, using the machine name.6) In order to ensure that master can automati

Setting up the Environment: jdk1.6,ssh Password-free communication System: CentOS 6.3 Cluster configuration: Namenode and ResourceManager on a single server, three data nodes Build User: YARN Hadoop2.2 Download Address: http://www.apache.org/dyn/closer.cgi/hadoop/common/ Step One: Upload Hadoop 2.2 and unzip to/export/yarn/ha