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https://issues.apache.org/jira/browse/ZOOKEEPER-1551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471706#comment-13471706
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Thawan Kooburat commented on ZOOKEEPER-1551:
--------------------------------------------
I think this patch is very critical and we need to fix it as soon as possible
since data inconsistency occur quite frequent in our environment due to this
bug.
The current patch doesn't break the compatibility so we can commit it. Then, we
can revisit/rewrite this logic as needed to fix ZOOKEEPER-1559.
> Observer ignore txns that comes after snapshot and UPTODATE
> ------------------------------------------------------------
>
> Key: ZOOKEEPER-1551
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1551
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.3
> Reporter: Thawan Kooburat
> Assignee: Thawan Kooburat
> Priority: Critical
> Fix For: 3.5.0
>
> Attachments: ZOOKEEPER-1551.patch
>
>
> In Learner.java, txns which comes after the learner has taken the snapshot
> (after NEWLEADER packet) are stored in packetsNotCommitted. The follower has
> special logic to apply these txns at the end of syncWithLeader() method.
> However, the observer will ignore these txns completely, causing data
> inconsistency.
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