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https://issues.apache.org/jira/browse/ZOOKEEPER-2020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108497#comment-14108497
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Hongchao Deng commented on ZOOKEEPER-2020:
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[~fpj][~thawan][~fanster.z]
> Change TRUNC to SNAP in sync phase for safety guarantee
> --------------------------------------------------------
>
> Key: ZOOKEEPER-2020
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2020
> Project: ZooKeeper
> Issue Type: Sub-task
> Components: quorum
> Affects Versions: 3.5.0
> Reporter: Hongchao Deng
> Fix For: 3.5.1
>
>
> ZOOKEEPER-1549 discusses the problem:
> "When the leader started, it will apply every txn in its txnlog (incl.
> uncommitted ones) into its in-memory data tree"
> I didn't any solution so far solved this problem in 3.5.x. Since this affects
> only TRUNC part -- only old leader that needs TRUNC applies uncommitted txns,
> a simple fix would be change current TRUNC logic to SNAP. This isn't hard to
> implement, but guarantees safety.
> Ideally, we will solve the whole problem by untangling all compatibility
> issues and fixing the protocol.
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