create a fast copy of le and directory tree gfs chunk

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Unformatted text preview: are huge by tradiEonal standards •  File mutaEons predominantly through appends 2/8/13 8 Colorado State University, Sangmi Pallickara 2/8/13 Spring 2013 L22.10 Colorado State University, Sangmi Pallickara 2/8/13 CS480 Principles of Data Management The file system interface Spring 2013 Architecture of GFS •  Does not implement standard APIs such as POSIX •  Supports create, delete, open, close, read and write Client •  snapshot Client GFS Master Client ...! –  Create a fast copy of file and directory tree GFS Chunk Server Linux File System •  record append –  MulEple files can concurrently append records to the same file GFS Chunk Server Linux File System GFS Chunk Server Linux File System •  Without addiEonal locking 2/8/13 Colorado State University, Sangmi Pallickara L22.11 2/8/13 Colorado State University, Sangmi Pallickara L22.12 2 2/8/13 CS480 Principles of Data Management Spring 2013 In GFS a file is broken up into fixedsize chunks CS480 Principles of Data Management •  This is fixed at 64 MB –  Much larger than typical FS block sizes (512 bytes) •  Obvious reason –  The file is too big Map-Reduce Spring 2013 Chunk size •  Lazy space alloca2on •  Set the stage for computaEons that operate on this data –  Stored as plain Linux file – ...
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