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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.

system namespace operations like opening, closing, and renaming files and directories. It also determines the mapping of blocks to DataNodes. The DataNodes are responsible for serving read and write requests from the file system’s clients. The DataNodes also perform block creation, deletion, and replication upon instruction from the NameNode.

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