Unnecessary snapshot transfers between new leader and followers
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Key: ZOOKEEPER-876
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-876
Project: Zookeeper
Issue Type: Bug
Affects Versions: 3.3.1
Reporter: Diogo
Priority: Minor
When starting a new leadership, unnecessary snapshot transfers happen between
new leader and followers. This is so because of multiple small bugs.
1) the comparison of zxids is done based on a new proposal, instead of the last
logged zxid. (LearnerFollower.java:310)
2) if follower is one zxid behind, the check of the interval of committed logs
excludes the follower. (LearnerFollower.java:269)
3) the bug reported in ZOOKEEPER-874 (commitLogs are empty after recover).
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