Transcription of HDFS Architecture Guide - Apache Hadoop
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HDFS Architecture Guide - Apache Hadoop
Copyright 2008 The Apache Software Foundation. All rights Architecture Guideby Dhruba BorthakurTable of contents1 Introduction .. 32 Assumptions and Goals .. 3 Hardware Failure .. 3 Streaming Data Access ..3 Large Data Sets .. 3 Simple Coherency Model .. 3 Moving Computation is Cheaper than Moving Data .. 4 Portability Across Heterogeneous Hardware and Software Platforms ..43 NameNode and DataNodes ..44 The File System Namespace .. 55 Data Replication ..6 Replica Placement: The First Baby Steps .. 7 Replica Selection .. 7 Safemode .. 86 The Persistence of File System Metadata ..87 The Communication Protocols .. 98 Robustness ..9 Data Disk Failure, Heartbeats and Re-Replication.
The Hadoop Distributed File System (HDFS) is a distributed file system designed to run on commodity hardware. It has many similarities with existing distributed file systems. However, the differences from other distributed file systems are significant. HDFS is highly fault-tolerant and is designed to be deployed on low-cost hardware. HDFS ...
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