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https://issues.apache.org/jira/browse/ZOOKEEPER-3127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16611781#comment-16611781
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Andor Molnar commented on ZOOKEEPER-3127:
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[~lvfangmin]
Would you please port this to 3.5 branch as well?
> Fixing potential data inconsistency due to update last processed zxid with
> partial multi-op txn
> -----------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3127
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3127
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.5.4, 3.6.0, 3.4.13
> Reporter: Fangmin Lv
> Assignee: Fangmin Lv
> Priority: Critical
> Labels: pull-request-available
> Fix For: 3.6.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Found this issue while checking the code for another issue, this is a
> relatively rare case which we haven't seen it on prod so far.
> Currently, the lastProcessedZxid is updated when applying the first txn of
> multi-op, if there is a snapshot in progress, it's possible that the zxid
> associated with the snapshot only include partial of the multi op.
> When loading snapshot, it will only load the txns after the zxid associated
> with snapshot file, which could data inconsistency due to missing sub txns.
> To avoid this, we only update the lastProcessedZxid when the whole multi-op
> txn is applied to DataTree.
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