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https://issues.apache.org/jira/browse/ZOOKEEPER-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13896983#comment-13896983
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Patrick Hunt commented on ZOOKEEPER-1879:
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I've been thinking about this for a bit. I was hoping it would be simple and we
could just add it to ZOOKEEPER-1573, however I'm not sure. In particular we
would need to handle the case where the child/parent znode were added/removed
multiple times. A simple check is probably not going to be good enough? We
should probably think about it a bit to make sure we handle all the various
cases.
> improve the correctness checking of txn log replay
> --------------------------------------------------
>
> Key: ZOOKEEPER-1879
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1879
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Affects Versions: 3.4.6, 3.5.0
> Reporter: Patrick Hunt
> Fix For: 3.4.7, 3.5.0
>
>
> In ZOOKEEPER-1573 we decided to fix an issue by relaxing some of the
> checking. Specifically when the sequence of txns is as follows:
> * zxid 1: create /prefix/a
> * zxid 2: create /prefix/a/b
> * zxid 3: delete /prefix/a/b
> * zxid 4: delete /prefix/a
> the log may fail to replay.
> We addressed this by relaxing a check, which is essentially invalid for this
> case, but is important in finding corruptions of the datastore.
> We should add this check back with proper validation of correctness.
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