24 4 21113 cs480 principles of data management spring

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Unformatted text preview: detect any replica that has become stale defined Concurrent success CS480 Principles of Data Management GFS guarantees the mutated file to be defined and to contain the data written by the last mutation Record Append Serial success 20 Colorado State University, Sangmi Pallickara 2/10/13 Spring 2013 Clients cache chunk locations… Colorado State University, Sangmi Pallickara 2/10/13 CS480 Principles of Data Management 22 Spring 2013 Implications for applications •  What if the chunk locaIon points to a stale replica before that informaIon is refreshed? •  Cache entry’s Imeout –  Next open to the file will purge all chunk informaIon for that file from the cache •  Append ­only •  Rely on appends instead of overwrites •  Checkpoint •  Write records that are –  Self ­validaIng –  Self ­idenIfying –  Stale replica usually returns a premature end of chunk rather than outdated data 2/10/13 Colorado State University, Sangmi Pallickara 23 November...
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