Explain why the protocol continues to execute correctly.
Consider a quorum consensus protocol in which an item is stored as five replicas and the size of each read and write quorum is three. Give a schedule that satisfies the following conditions:
Three different transactions write to the item. Then two of the replica sites fail, leaving only three copies—all of which contain different values.
T1: w1 w2 w3
T2: w3 w4 w5
T3: w1 w3 w5
Site failures s1 fails s3 fails
The three remaining copies are at s2 (which was last updated by T1), s4 (which was last updated by T2), and s5 (which was last updated by T3). Each of the copies has a different value, but the value at s5 was updated last and is the correct value.
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