38 november 5th 2012 cs480 principles of data

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Unformatted text preview: distances from IP addresses •  Client retries the failed mutaIon •  Pipeline the data transfer –  Once a chunkserver receives some data, it starts forwarding immediately. November 5th, 2012 CS480 Principles of Data Management L23.33 Spring 2013 CS480 Principles of Data Management –  On behalf of apps that read or write data •  Interact with master for metadata •  Data ­bearing communicaIons directly to chunk servers November 5th, 2012 L23.35 Spring 2013 Traditional writes GFS client code implements the file system API •  CommunicaIons with master and chunk servers done transparently L23.34 November 5th, 2012 •  Client specifies offset at which data needs to be wrioen •  Concurrent writes to same region –  Not serializable –  Region ends up containing data fragments from mul%ple clients November 5th, 2012 L23.36 6 2/11/13 CS480 Principles of Data Management Spring 2013 Atomic record appends CS480 Principles of Data Management Spring 2013 The control flow for record appends is similar to that of writes •  Client specifies only the data not the offset •  GFS appends it to the file –  At least once atomically –...
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