Each coordinator must record the names of its subordinates safely before any of the latter could
get into the prepared state. Then, when the coordinator site aborts on recovery from a crash that
occurred after the sending of the prepare message, the restart process will know whom to inform
about the abort message and from which subordinates acknowledgements should be received. These
modifi cations complete the PC protocol. The name arises from the fact that in the no-information case
the transaction is presumed to have committed, and hence the response to an inquiry is a commit.
The PC protocol is more effi
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