One participant votes no. What is the outcome?

• Commit everywhere
• Abort everywhere
• Commit where voters said yes

What are the two phases of the protocol?

• Commit first, then ask permission
• Prepare and vote, then decide and obey
• Lock everything, then unlock everything

A participant that voted yes must keep its locks until it learns the coordinator's decision.

All stores voted yes and the coordinator sends abort. What do they do?

• Obey and abort, since yes promised obedience
• Commit anyway, since all votes were yes
• Vote again until the answer is commit

The coordinator collects yes votes from all three stores, then crashes before sending anything. What happens?

• The stores wait, blocked, with locks held
• Each store commits on its own
• Each store aborts on its own

Why is a yes-voter forbidden from timing out and aborting alone?

• Timeouts are not allowed in the protocol
• Aborting alone is always slower
• The coordinator may already have told others to commit

The coordinator crashes. Which timing leaves no participant stuck waiting?

• After collecting yes votes but before deciding
• After sending commit to some stores only
• Before any store voted yes

Lee says running consensus on the decision keeps commit just as cheap. What is the mistake?

• Consensus removes the need for any vote
• Survivors still cannot finish without the coordinator
• Every commit pays extra message rounds