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Optimizing Hadoop for MapReduce
Table of Contents
Optimizing Hadoop for MapReduce
Credits
About the Author
Acknowledgments
About the Reviewers
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Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Errata
Piracy
Questions
1. Understanding Hadoop MapReduce
The MapReduce model
An overview of Hadoop MapReduce
Hadoop MapReduce internals
Factors affecting the performance of MapReduce
Summary
2. An Overview of the Hadoop Parameters
Investigating the Hadoop parameters
The mapred-site.xml configuration file
The CPU-related parameters
The disk I/O related parameters
The memory-related parameters
The network-related parameters
The hdfs-site.xml configuration file
The core-site.xml configuration file
Hadoop MapReduce metrics
Performance monitoring tools
Using Chukwa to monitor Hadoop
Using Ganglia to monitor Hadoop
Using Nagios to monitor Hadoop
Using Apache Ambari to monitor Hadoop
Summary
3. Detecting System Bottlenecks
Performance tuning
Creating a performance baseline
Identifying resource bottlenecks
Identifying RAM bottlenecks
Identifying CPU bottlenecks
Identifying storage bottlenecks
Identifying network bandwidth bottlenecks
Summary
4. Identifying Resource Weaknesses
Identifying cluster weakness
Checking the Hadoop cluster node's health
Checking the input data size
Checking massive I/O and network traffic
Checking for insufficient concurrent tasks
Checking for CPU contention
Sizing your Hadoop cluster
Configuring your cluster correctly
Summary
5. Enhancing Map and Reduce Tasks
Enhancing map tasks
Input data and block size impact
Dealing with small and unsplittable files
Reducing spilled records during the Map phase
Calculating map tasks' throughput
Enhancing reduce tasks
Calculating reduce tasks' throughput
Improving Reduce execution phase
Tuning map and reduce parameters
Summary
6. Optimizing MapReduce Tasks
Using Combiners
Using compression
Using appropriate Writable types
Reusing types smartly
Optimizing mappers and reducers code
Summary
7. Best Practices and Recommendations
Hardware tuning and OS recommendations
The Hadoop cluster checklist
The Bios tuning checklist
OS configuration recommendations
Hadoop best practices and recommendations
Deploying Hadoop
Hadoop tuning recommendations
Using a MapReduce template class code
Summary
Index
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