# Java property: hadoop.security.logger # export HADOOPSECURITYLOGGER=INFO,NullAppender # Default process priority level # Note that sub-processes will also run at this level! # export HADOOPNICENESS=0 # Default name for the service level authorization file # Java property: hadoop.policy.file # export HADOOPPOLICYFILE='hadoop.
Installation and configuration of Hadoop in MAC environment. Today, due to the needs of cloud computing experiments and great interest in cloud computing, Hadoop is installed on your Mac. Let me briefly introduce Hadoop: Hadoop is a distributed system infrastructure developed by the Apache foundation. . Replace the version of hadoop in the checksum link if you are installing other version. The link shows the checksum in uppercase and spaces, you may need to change the key to lowercase and remove spaces for it to work. After updating the hadoop.rb file, it should look as follows: Now we can install hadoop using brew as brew install hadoop. Download the checksum hadoop-X.Y.Z-src.tar.gz.sha512 or hadoop-X.Y.Z-src.tar.gz.mds from Apache. Shasum -a 512 hadoop-X.Y.Z-src.tar.gz; All previous releases of Hadoop are available from the Apache release archive site. Many third parties distribute products that include Apache Hadoop and related tools.
Setup Hadoop(HDFS) on Mac
This tutorial will provide step by step instruction to setup HDFS on Mac OS.
Download Apache Hadoop You can click here to download apache Hadoop 3.0.3 version or go to Apache site http://hadoop.apache.org/releases.html to download directly from there.Move the downloaded Hadoop binary to below path & extract it. There are 6 steps to complete in order setup Hadoop (HDFS)
Validate if java is installed
Setup environment variables in .profile file
Setup configuration files for local Hadoop
Setup password less ssh to localhost
Initialize Hadoop cluster by formatting HDFS directory
Starting Hadoop cluster
Each Step is described in detail below
Validating Java: Java version can be checked using below command. If java is not present or lower version(Java 8 is recommended) is installed then latest JDK can be download from Oracle site here and can be installed.
Set below variables in the .profile file in $HOME directory Note: Path of Java Home can be determined by using below command in Terminal
In order to set HDFS, please make changes (as mentioned in detail below) in the following files under $HADOOP_HOME/etc/hadoop/
core-site.xml
hdfs-site.xml
mapred-site.xml
yarn-site.xml
hadoop-env.sh
core-site.xml : Please add below listed XML properties in $HADOOP_HOME/etc/hadoop/core-site.xml file
hdfs-site.xml : Please add below listed XML properties in $HADOOP_HOME/etc/hadoop/hdfs-site.xml file
yarn-site.xml : Please add below listed XML properties in $HADOOP_HOME/etc/hadoop/yarn-site.xml file
mapred-site.xml : Please add below listed XML properties in $HADOOP_HOME/etc/hadoop/mapred-site.xml file
hadoop-env.sh : Please add below environment variables in $HADOOP_HOME/etc/hadoop/hadoop-env.sh file
Hadoop namenode & secondary namenode requires password less ssh to localhost in order to start. 2 things need to be done to setup password less ssh.
Enable Remote Login in System Preference --> Sharing, get your username added in allowed user list if you are not administrator of the system.
Generate & setup key
Initialize Hadoop cluster by formatting HDFS directory[Run below commands in terminal]
Starting Hadoop cluster
Starting both hdfs & yarn servers in single command
Other Commands to start hdfs & yarn servers one by one.
What Is Hadoop
Checking if all the namenode, datanode & resource manager started or not (using jps command) Health of the hadoop cluster & yarn processing can be checked on Web UI Stopping Hadoop cluster
Stopping both hdfs & yarn servers in single command
Other Commands to start hdfs & yarn servers one by one.
Running Basic HDFS Command
Hadoop Version
List all directories
Creating user home directory
Copy file from local to HDFS
Checking data in the file on HDFS
Pseudo-Distributed Operation
Hadoop can also be run on a single-node in a pseudo-distributed mode where each Hadoop daemon runs in a separate Java process.
If you cannot ssh to localhost without a passphrase, execute the following commands:
Hadoop Mac Os X
Execution
The following instructions are to run a MapReduce job locally. If you want to execute a job on YARN, see YARN on Single Node.
Download Hadoop 2.7.1
Format the filesystem:
Start NameNode daemon and DataNode daemon:
The hadoop daemon log output is written to the $HADOOP_LOG_DIR directory (defaults to $HADOOP_HOME/logs).
Browse the web interface for the NameNode; by default it is available at:
NameNode - http://localhost:50070/
Make the HDFS directories required to execute MapReduce jobs: Camera raw 9.10 download.
Copy the input files into the distributed filesystem:
Run some of the examples provided:
Examine the output files: Copy the output files from the distributed filesystem to the local filesystem and examine them:
or
View the output files on the distributed filesystem:
When you’re done, stop the daemons with:
YARN on a Single Node
You can run a MapReduce job on YARN in a pseudo-distributed mode by setting a few parameters and running ResourceManager daemon and NodeManager daemon in addition.
The following instructions assume that 1. ~ 4. steps of the above instructions are already executed.
Configure parameters as follows:etc/hadoop/mapred-site.xml:
etc/hadoop/yarn-site.xml:
Start ResourceManager daemon and NodeManager daemon:
Browse the web interface for the ResourceManager; by default it is available at: