12 2 21113 cs480 principles of data management spring

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Unformatted text preview: file sizes are exact multiples of chunk sizes •  Master can scan its state in the background CS480 Principles of Data Management Data = array( 0 => ‘use’, 1 => ‘0d’, 2 => ‘0ful’, 3 => ‘2ly’, 4 => ‘2ness’, 5 => ‘0less’, 6 => ‘4ly’, 7 => ‘4ness’, ); Size of the file system with 1 TB of RAM: •  Speed 2/11/13 Spring 2013 Prefix compression (chunk handle, chunk locaIon) GFS Chunk Server Linux File System Control messages GFS Master GFS Chunk Server Linux File System Colorado State University, Sangmi Pallickara Data message GFS Chunk Server Linux File System L22.12 2 2/11/13 CS480 Principles of Data Management Spring 2013 CS480 Principles of Data Management Spring 2013 Caching at the client/chunk servers •  Clients do not cache file data (for reading) –  At client the working set may be too large –  Simplify client; eliminate cache ­coherence problems •  Chunk servers do not cache file data either (for reading) Consistency in GFS: " Rel...
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