With the advent of Hadoop, there comes the need for professionals skilled in Hadoop Administration making it imperative to be skilled as a Hadoop Admin for better career, salary and job opportunities.

1. Administer Hadoop Cluster
View Hadoop Administration Course at www.edureka.co/hadoop-admin

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Objectives
At the end of this module, you will be able to
Understand Hadoop fully distributed cluster setup with two nodes
Rack awareness
Understand Active NameNode Failure and how passive takes over
Hadoop 2.x Cluster Architecture – Federation
Hadoop Admin Responsibilities

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Hadoop Cluster: A Typical Use Case
NameNode Secondary NameNode
DataNode
RAM: 64 GB,
Hard disk: 1 TB
Processor: Xenon with 8 Cores
Ethernet: 3 X 10 GB/s
OS: 64-bit CentOS
Power: Redundant Power Supply
RAM: 32 GB,
Hard disk: 1 TB
Processor: Xenon with 4 Cores
Ethernet: 3 X 10 GB/s
OS: 64-bit CentOS
Power: Redundant Power Supply
RAM: 16GB
Hard disk: 6 X 2TB
Processor: Xenon with 2 cores.
Ethernet: 3 X 10 GB/s
OS: 64-bit CentOS
DataNode
RAM: 16GB
Hard disk: 6 X 2TB
Processor: Xenon with 2 cores.
Ethernet: 3 X 10 GB/s
OS: 64-bit CentOS

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Seeking cluster growth on storage capacity is often a good method to use!
Cluster Growth Based On Storage Capacity
Data grows by approximately
5TB per week
HDFS set up to replicate each
block three times
Thus, 15TB of extra storage
space required per week
Assuming machines with 5x3TB
hard drives, equating to a new
machine required each week
Assume Overheads to be 30%

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Slave Nodes: Recommended Configuration
Higher-performance vs lower performance components
Save the Money, Buy more Nodes!
 General ( Depends on requirement
‘base’ configuration for a slave Node
» 4 x 1 TB or 2 TB hard drives, in a
JBOD* configuration
» Do not use RAID!
» 2 x Quad-core CPUs
» 24 -32GB RAM
» Gigabit Ethernet
General Configuration
 Multiples of ( 1 hard drive + 2 cores
+ 6-8GB RAM) generally work well
for many types of applications
Special Configuration
Slave Nodes
“A cluster with more nodes performs better than one with fewer, slightly faster nodes”

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Slave Nodes: More Details (RAM)
Slave Nodes (RAM)
Generally each Map or Reduce task
will take 1GB to 2GB of RAM
Slave nodes should not be using
virtual memory
RULE OF THUMB!
Total number of tasks = 1.5 x number
of processor core
Ensure enough RAM is present to
run all tasks, plus the DataNode,
TaskTracker daemons, plus the
operating system

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Master Node Hardware Recommendations
Carrier-class hardware
(Not commodity hardware)
Dual power supplies
Dual Ethernet cards
(Bonded to provide failover)
Raided hard drives
At least 32GB of RAM
Master
Node
Requires

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Hadoop Cluster Modes
Hadoop can run in any of the following three modes:
Fully-Distributed Mode
Pseudo-Distributed Mode
 No daemons, everything runs in a single JVM
 Suitable for running MapReduce programs during development
 Has no DFS
 Hadoop daemons run on the local machine
 Hadoop daemons run on a cluster of machines
Standalone (or Local) Mode

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Configuration Files
Configuration
Filenames
Description of Log Files
hadoop-env.sh
yarn-env.sh
Settings for Hadoop Daemon’s process environment.
core-site.xml
Configuration settings for Hadoop Core such as I/O settings that common to both HDFS and
YARN.
hdfs-site.xml Configuration settings for HDFS Daemons, the Name Node and the Data Nodes.
yarn-site.xml Configuration setting for Resource Manager and Node Manager.
mapred-site.xml Configuration settings for MapReduce Applications.
slaves A list of machines (one per line) that each run DataNode and Node Manager.

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Configuration Files (Contd.)
Deprecated Property Name New Property Name
dfs.data.dir dfs.datanode.data.dir
dfs.http.address dfs.namenode.http-address
fs.default.name fs.defaultFS
The core functionality and usage of these core configuration files are same in Hadoop 2.0 and 1.0 but many new properties
have been added and many have been deprecated
For example:
 ’fs.default.name’ has been deprecated and replaced with ‘fs.defaultFS’ for YARN in core-site.xml
 ‘dfs.nameservices’ has been added to enable NameNode High Availability in hdfs-site.xml
http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/DeprecatedProperties.html
 In Hadoop 2.2.0 release, you can use either the old or the new properties
 The old property names are now deprecated, but still work!

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Replication and Rack Awareness

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NameNode HA

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Hadoop 2.x Cluster Architecture - Federation
Namespace
NN-1 NN-k NN-n
Common Storage
BlockStorage
… …
Hadoop 2.0
http://hadoop.apache.org/docs/stable2/hadoop-project-dist/hadoop-hdfs/Federation.html
NS1 NSk NSn
Datanode 1
…
Datanode m
…
Datanode 2
…
Pool 1 Pool k Pool n
Block Pools

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Hadoop Admin Responsibilities
Responsible for implementation and administration of Hadoop infrastructure.
Testing HDFS, Hive, Pig and MapReduce access for Applications.
Cluster maintenance tasks like Backup, Recovery, Upgrade, Patching.
Performance tuning and Capacity planning for Clusters.
Monitor Hadoop cluster and deploy security.

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DEMO

16. LIVE Online Class
Class Recording in LMS
24/7 Post Class Support
Module Wise Quiz
Project Work
Verifiable Certificate
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How it Works?

17. Questions
www.edureka.co/hadoop-adminSlide 17 Twitter @edurekaIN, Facebook /edurekaIN, use #askEdureka for Questions

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Course Topics
 Module 1
» Hadoop Cluster Administration
 Module 2
» Hadoop Architecture and Cluster setup
 Module 3
» Hadoop Cluster: Planning and Managing
 Module 4
» Backup, Recovery and Maintenance
 Module 5
» Hadoop 2.0 and High Availability
 Module 6
» Advanced Topics: QJM, HDFS Federation and
Security
 Module 7
» Oozie, Hcatalog/Hive and HBase Administration
 Module 8
» Project: Hadoop Implementation