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https://issues.apache.org/jira/browse/OAK-927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-927:
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Issue Type: Bug (was: Sub-task)
Parent: (was: OAK-144)
> Concurrent commits may cause duplicate observation events
> ---------------------------------------------------------
>
> Key: OAK-927
> URL: https://issues.apache.org/jira/browse/OAK-927
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: core
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Labels: observation
> Fix For: 0.9
>
>
> Chetan discovered that in some cases spurious observation events would be
> created when to sessions save concurrently. In a nutshell the problem occurs
> since the current implementation of observation expects a linear sequence of
> revisions (per cluster node). However on Root.commit there is a small race
> between rebasing and merging a branch: when another session saves inside this
> time frame, its branch will have the same base revision like that of the
> former session. In this case the sequence of revisions is effectively non
> linear.
> Full discussion: http://markmail.org/message/cbzrztagurplxo4r
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