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ZOOKEEPER-4883: Rollover leader epoch when zxid counter is exhausted #2208
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The rollover procedure: 1. Treats last proposal of an epoch as rollover proposal. 2. Requests from next epoch are proposed normally. 3. Fences next epoch once rollover proposal persisted. 4. Proposals from next epoch will not be written to disk before rollover committed. 5. Leader commits rollover proposal once it get quorum ACKs. 6. Blocked new epoch proposals are logged once rollover proposal is committed in corresponding nodes. This results in: 1. No other leader cloud lead using next epoch number once rollover proposal is considered committed. 2. No proposals from next epoch will be written to disk before rollover proposal is considered committed. Refs: ZOOKEEPER-1277, ZOOKEEPER-2789, ZOOKEEPER-4870, ZOOKEEPER-4882, ZOOKEEPER-4570 and ZOOKEEPER-4571
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The rollover procedure:
This results in:
Refs: ZOOKEEPER-1277, ZOOKEEPER-2789, ZOOKEEPER-4870, ZOOKEEPER-4882, ZOOKEEPER-4570 and ZOOKEEPER-4571