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Diogo commented on ZOOKEEPER-876: --------------------------------- If follower is one zxid behind, the check of the interval of committed logs excludes the follower in LearnerFollower.java:269. For example, if follower has snapshot-1000 and no logs, and leader has snapshot-1000, log-1001, and so on. The check in that line would force the follower receive again a snapshot. I think the condition should consider minCommittedLog - 1 as lower bound in the test. > Unnecessary snapshot transfers between new leader and followers > --------------------------------------------------------------- > > 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). -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.