11 chunk data allows list to be in sync with reality

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Unformatted text preview: x 220 = 260 = 1 EB •  Add extra memory to increase file system size L23.9 Colorado State University, Sangmi Pallickara Spring 2013 L23.10 Colorado State University, Sangmi Pallickara 2/11/13 CS480 Principles of Data Management Tracking the chunk servers Spring 2013 Simple read example (file name, chunk index within a file) •  Master does not keep a persistent copy of the locaIon of chunk servers Client L23.11 Chunk data –  Allows list to be in sync with reality despite failures –  Chunk server has final word on chunks it holds 2/8/13 (chunk handle, byte range) •  List maintained via heart ­beats Colorado State University, Sangmi Pallickara Spring 2013 •  Number of entries = 240/26 –  Implement chunk garbage collecIon –  Re ­replicate if there are failures –  Chunk migraIon to balance load and space 2/8/13 8 Colorado State University, Sangmi Pallickara 2/11/13 Assume...
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