ZOOKEEPER-3922: The introduction of the oracle, a failure detector. #109
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The introduction of the oracle makes ZooKeeper fault-tolerant in two-node systems. The major changes are: 1. QuorumPeerConfig.java - The changes allow users to enable the oracle and provide essential information. - Create QuorumOracleMaj if configured. 2. FastLeaderElection.java - A re-check mechanism checks the current received votes once the timeout expires. - Add another case when receiving a LEADING notification for a node to locate the existed leader in two-node systems. 3. Leader.java - Add a re-validation of outstanding proposals mechanism after the only follower goes away - Add another handling case when the quorum is not maintainable. It queries the Oracle for maintaining the quorum along. 4. QuorumVerifier.java - Add methods for QuorumOracleMaj.java 5. QuorumOracleMaj.java (This is a new file.) - A sub-class of QuorumMaj - It default reads a file that contains a binary value to behave as an Oracle. Author: Ching-Chan Lee <[email protected]> Reviewers: Benjamin Reed <[email protected]>, Michael Han <[email protected]> Closes apache#1444 from chingchan1996/ZOOKEEPER-3922
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The introduction of the oracle makes ZooKeeper fault-tolerant in two-node systems.
The major changes are:
Author: Ching-Chan Lee [email protected]
Reviewers: Benjamin Reed [email protected], Michael Han [email protected]
Closes apache#1444 from chingchan1996/ZOOKEEPER-3922