6 1 21113 cs480 principles of data management spring

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Unformatted text preview: 2559 3071 3583 4095 … 2 Colorado State University, Sangmi Pallickara •  Vastly simplifies design •  Easy to use global knowledge to reason about –  Chunk placements –  ReplicaIon decisions L22.5 2/8/13 Colorado State University, Sangmi Pallickara L22.6 1 2/11/13 CS480 Principles of Data Management Spring 2013 ALL system metadata is managed by the Master and stored in Main Memory ①  File and chunk namespaces ②  Mapping from files to chunks CS480 Principles of Data Management use Data = array( 0 => ‘use’, 1 => ‘0d’, 2 => ‘0ful’, 3 => ‘0fully’, 4 => ‘0fullness’, 5 => ‘0less’, 6 => ‘0lessly’, 7 => ‘0lessness’, ); used useful Logs mutations into a permanent log usefully usefulness ③  LocaIon of chunks useless uselessly uselessness L22.7 Colorado State University, Sangmi Pallickara 2/8/13 CS480 Principles of Data Management Spring 2013 Why keep the entire metadata in memory? CS480 Principles of Data Management •  MAXIMUM SIZE of the file system = Number of entries x Chunk size = (240 /26 ) x 26...
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