15 spring 2013 2813 colorado state university sangmi

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Unformatted text preview: Extended only as needed –  Parallel I/O –  I/O seek Emes are 14 x 106 slower than CPU access Emes 2/8/13 L22.13 Colorado State University, Sangmi Pallickara CS480 Principles of Data Management Spring 2013 •  Reduces client interac2on with the master –  Assigned by the Master •  Reduce network overhead –  With a large chunk, client performs more operaEons –  Persistent connecEons •  Reduce size of metadata stored in the master •  Chunks are stored by chunk servers –  On local disks as LINUX files •  Each chunk is replicated –  64 bytes of metadata per 64 MB chunk CS480 Principles of Data Management –  Default is 3 L22.15 Spring 2013 2/8/13 Colorado State University, Sangmi Pallickara Spring 2013 Why have a single Master? Single master Manage system metadata Leasing of chunks Garbage collec2on of orphaned chunks Chunk migra2ons 2/8/13 L22.16 Colorado State University, Sangmi Pallickara CS480 Principles of Data Management Master operations •  •  •  •  •  Spring 2013 •  Each chunk has a 64 ­bit globall...
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