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https://issues.apache.org/jira/browse/ZOOKEEPER-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13897577#comment-13897577
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Thawan Kooburat commented on ZOOKEEPER-1879:
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We can contribute our "consistency checker" as a contrib module. It is
essentially a program that read the entire data tree from 2 servers using
normal client API and compare it. It has heuristic to ignore in-flight
changes so it never report false positive. We use this program to make
pair-wise comparison between servers in each production ensemble.
> 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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