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You're reading from Monitoring Hadoop

Product typeBook

Published inApr 2015

Publisher

ISBN-139781783281558

Edition1st Edition

Tools

Hadoop

Concepts

Data Processing

Author (1)

Aman Singh

Hadoop daemons

Hadoop is a distributed framework with two important components: HDFS and MapReduce. Hadoop has two main versions: Hadoop 1.0 and Hadoop 2.0. The original Hadoop 1.0 has NameNode, DataNode, JobTracker, and TaskTracker. In Hadoop 2.0, a new YARN framework has come into picture, which replaces JobTracker and TaskTracker with ResourceManager and NodeManager respectively. HDFS is the File System or the storage layer, and MapReduce is the programming model.

Each layer has a master and a slave to handle the communication and coordination between them. In order to set up monitoring, it is important to take into account the services and ports used by each node.

NameNode

NameNode is the master node that takes care of the HDFS File System. There are many important things to take care in NameNode in terms of services and ports. The following table lists parameters which need to be monitored:

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Monitoring Hadoop

Published in: Apr 2015Publisher: ISBN-13: 9781783281558

Author (1)

Aman Singh

Gurmukh Singh is a seasoned technology professional with 14+ years of industry experience in infrastructure design, distributed systems, performance optimization, and networks. He has worked in big data domain for the last 5 years and provides consultancy and training on various technologies. He has worked with companies such as HP, JP Morgan, and Yahoo. He has authored Monitoring Hadoop by Packt Publishing
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Parameter	Description
`dfs.name.dir` `dfs.namenode.name.dir`	This is the parameter in `hdfs-site...`

Parameter

Description

dfs.name.dir

dfs.namenode.name.dir

This is the parameter in hdfs-site...

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Hadoop daemons

NameNode

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