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https://issues.apache.org/jira/browse/JCR-1078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12522061
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Martijn Hendriks commented on JCR-1078:
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I think that the following holds for a ChangeLog:
1) state \in addedStates => no deleted(state) events after the added(state)
event.
2) state \in modifiedStated => no added(state) event and no deleted(state)
event after the modified(state) event
3) state \in deletedStates => no added(state) event earlier
The serialization code should derive an ordering such that these properties
hold.
> ChangeLog serialization causes cache inconsistencies
> ----------------------------------------------------
>
> Key: JCR-1078
> URL: https://issues.apache.org/jira/browse/JCR-1078
> Project: Jackrabbit
> Issue Type: Bug
> Components: clustering
> Affects Versions: 1.3
> Environment: Clustered Jackrabbit 1.3
> Reporter: Martijn Hendriks
>
> The ordering of actions is taken into account when a ChangeLog is built
> through session manipulations (see, for instance,
> ChangeLog.deleted(ItemState state)). When it is serialized in
> ClusterNode.write(Record record, ChangeLog changeLog, EventStateCollection
> esc), however, this implicit ordering might be changed. As a consequence,
> the deserialization in ClusterNode.consume(Record record) might produce a
> different ChangeLog with the effect that the local caches get out-of-sync
> with the persistent state of the repository.
> The issue should be reproducable as follows:
> - Setup a clustered environment with two Jackrabbit instances, say A and B.
> - On instance A add a property "P" with value "x" to some node and save the
> session.
> - On instance B read property "P" -> it will have value "x".
> - On instance A delete property P and then add it again with value "y" and
> save the session.
> - On instance B read property "P" -> it will still have value "x" after the
> cluster sync...
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