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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.

HDFS Architecture Guide ... 1 Introduction 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. ... replicas of a file do not evenly distribute across the racks. One third of replicas are on one

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