Foreword
Preface
1．MeetHadoop
Data!
Data Storage and Analysis
Comparison with Other Systems
RDBMS
Grid Computing
Volunteer Computing
A Brief History of Hadoop
Apache Hadoop and the Hadoop Ecosystem
2．MapReduce
A Weather Dataset
Data Format
Analyzing the Data with Unix Tools
Analyzing the Data with Hadoop
Map andReduce
Java MapReduce
Scaling Out
Data Flow
Combiner Functions
Running a Distributed MapReduce Job
Hadoop Streaming
Ruby
Python
Hadoop Pipes
Compiling and Running
3．TheHadoopDistributed Filesystem
The Design of HDFS
HDFS Concepts
Blocks
Namenodes and Datanodes
The Command．Line Interfaca
Basic Filesystem Operations
Hadoop Filesystems
Interfaces
The Java Interface
Reading Data from a Hadoop URL
Reading Data Using the FileSystem API
Writing Data
Directories
Querying the Filesystem
Deleting Data
Data Flow
Anatomy of a File Read
Anatomy of a File Write
Coherency Model
Parallel Copying with distcp
Keeping an HDFS Cluster Balanced
Hadoop Archives
Using Hadoop Archives
Limitations
4．Hadoop4Hadoop
Data Integrity
Data Integrity in HDFS
LocalFileSystem
ChecksumFileSystem
Compression
Codecs
Compression and Input Splits
Using Compression in MapReduce
Serialization
The Writable Interface
Writable Classes
Implementing a Custom Writable
Serialization Frameworks
Avro
File—Based Data Structures
SequenceFile
……
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