Hadoop Installation On Windows 7

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Installing Hadoop-2.6.x on Windows 10. Shantanu Sharma. Department of. Install Java 8: Download Java 8 from the link. I am working on hadoop installation in Windows 7. Tried to untar the tarfiles from apache site but it was unsuccessful. I have searched in internet and found below link. This document describes how to set up and configure a single-node Hadoop installation so that you can quickly perform simple operations using Hadoop MapReduce and the Hadoop Distributed File System (HDFS).

  1. Install Apache Hadoop On Windows
  2. Hadoop Installation On Windows 7

I am new to hadoop and trying to get a single node setup of Hadoop 0.20.2 on my Windows 7 machine.

My questions are two-fold - one with respect to the completeness of the installation itself and the other regarding the error in the reduce stage of a sample Word Count program.

My Installation steps are as follows:

I am following http://blog.benhall.me.uk/2011/01/installing-hadoop-0210-on-windows.html for the installation procedure.

I have installed cygwin and set up password-less ssh on my localhostMy java version is:

Contents of conf/core-site.xml:

Contents of conf/hdfs-site.xml:

Contents of conf/mapred-site.xml:

I set the JAVA_HOME variable and the command 'hadoop version' prints 0.20.2hadoop namenode -format creates the DFS without any errors

start-all.sh prints that namenode, secondarynamenode, datanode, jobtracker and tasktracker have all started.

however, the command 'jps' prints:

Install Apache Hadoop On Windows

I noticed in that jps printed the pids' of tasktracker, secondarynamenode as well.

I am able to view the output of

I tried both put and get commands to the hdfs and they were successful:

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I could also view these files by browsing the DFS via the http interface for namenode

  1. Is my installation complete?
  2. If yes, why does the jps command not show the pids of all five components?
  3. If not, then, what steps do i need to complete the installation?
  4. What are other sanity checks used to test the completeness of the installation?

I initially believed my installation to be complete and ran a sample WordCount map-reduce program along the lines of http://jayant7k.blogspot.com/2010/06/writing-your-first-map-reduce-program.html

I obtain the following output:

The map task seems complete, but the reduce task shows the following error in the logs:

The following are the contents of the task tracker logs:

I had opened the ports 9000 and 9001 in the windows firewallI checked the telnet output to verify that these ports were indeed open:

Could you help with both the issues of installation and getting the reduce task to work?

Youtube saigon kick love is on the way. I looked at and a few other links and tried the suggestions, but without any success.

I appreciate your patience in reading this post and would be happy to provide additional details.

Thanks in advance.

user1290793
user1290793user1290793

1 Answer

See this line in your logs:

I am guessing that you need to check hadoop.tmp.dir and mapred.local.dir. You mentioned about the configs that you are using and so the values of these two params is default. The default values of these params is given here. Set those to some relevant location and try again.

Hadoop Installation On Windows 7

NOTE: Before you this change, you need to stop hadoop and start after you are done.

Tejas PatilTejas Patil

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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.

Configuration

Use the following:

etc/hadoop/core-site.xml:

etc/hadoop/hdfs-site.xml:

Setup passphraseless ssh

Now check that you can ssh to the localhost without a passphrase:

If you cannot ssh to localhost without a passphrase, execute the following commands:

Execution

Installation

The following instructions are to run a MapReduce job locally. If you want to execute a job on YARN, see YARN on Single Node.

  1. Format the filesystem:

  2. Start NameNode daemon and DataNode daemon:

    The hadoop daemon log output is written to the $HADOOP_LOG_DIR directory (defaults to $HADOOP_HOME/logs).

  3. Browse the web interface for the NameNode; by default it is available at:

    • NameNode - http://localhost:50070/

  4. Make the HDFS directories required to execute MapReduce jobs:

  5. Copy the input files into the distributed filesystem:

  6. Run some of the examples provided:

  7. 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:

  8. 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.

  1. Configure parameters as follows:etc/hadoop/mapred-site.xml:

    etc/hadoop/yarn-site.xml:

  2. Start ResourceManager daemon and NodeManager daemon:

  3. Browse the web interface for the ResourceManager; by default it is available at:

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    • ResourceManager - http://localhost:8088/

  4. Run a MapReduce job.

  5. When you’re done, stop the daemons with: