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https://issues.apache.org/jira/browse/OAK-6455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16096332#comment-16096332
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Tomek Rękawek commented on OAK-6455:
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It seems that introducing this lock slows down the Oak by the factor of 10x in
the extreme cases. Let's try to optimize it.
> Don't call observer concurrently from the CompositeNodeStore
> ------------------------------------------------------------
>
> Key: OAK-6455
> URL: https://issues.apache.org/jira/browse/OAK-6455
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: composite
> Reporter: Tomek Rękawek
> Assignee: Tomek Rękawek
> Fix For: 1.8, 1.7.4
>
>
> Per Observer interface
> {noformat}
> However, each observer is
> * always guaranteed to see a linear sequence of changes. In other words the
> * method will not be called concurrently from multiple threads and successive
> * calls represent a linear sequence of repository states, i.e. the root
> * state passed to a call is guaranteed to represent a repository state
> {noformat}
> Currently concurrent merge would result in concurrent calls to Observer. So
> that would need to be serialized
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