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https://issues.apache.org/jira/browse/ZOOKEEPER-876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912979#action_12912979
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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).
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