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https://issues.apache.org/jira/browse/ZOOKEEPER-876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thawan Kooburat resolved ZOOKEEPER-876.
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Resolution: Fixed
ZOOKEEPER-1413 address all of the issues mentioned in the description. However,
there is one corner case (used by the unit test in this patch) which is not
covered by ZOOKEEPER-1413 where the learner tries to sync with leader with no
txnlog.
> 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: 3.4.0
> Reporter: Diogo
> Assignee: Diogo
> Priority: Minor
> Fix For: 3.5.0
>
> Attachments: second_case.patch, second_case.txt,
> TEST-org.apache.zookeeper.test.FollowerResyncConcurrencyTest.txt,
> ZOOKEEPER-876.patch
>
>
> 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. (LearnerHandler.java ~ 297)
> 2) if follower is one zxid behind, the check of the interval of committed
> logs excludes the follower. (LearnerHandler.java ~ 277)
> 3) the bug reported in ZOOKEEPER-874 (commitLogs are empty after recover).
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