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31 november 5th 2012 cs480 principles of data

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Unformatted text preview: th, 2012 Spring 2013 Revocation and transfer of leases L23.28 November 5th, 2012 CS480 Principles of Data Management Spring 2013 How a write is actually performed •  Master may revoke a lease before it expires 4. Write request •  If communicaIons lost with primary 1.  Chunkserver holding the current lease for the chunk and the locaIon of the other replica Client 3*. –  Master can safely give lease to another replica MASTER 2. IdenIty of the primary and the locaIons of the other replicas Secondary Replica A •  ONLY AFTER the lease period for old primary elapses 7. Final Reply Primary Replica 5. Write request/ 6. Acknowledgement Secondary Replica B 3. Client pushes the data to all the replicas November 5th, 2012 L23.29 November 5th, 2012 L23.30 5 2/11/13 CS480 Principles of Data Management Spring 2013 Client pushes data to all the replicas (I ) •  Each chunk server stores data in an LRU...
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