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https://issues.apache.org/jira/browse/OAK-5559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger resolved OAK-5559.
-----------------------------------
Resolution: Fixed
Fix Version/s: 1.7.0
Applied a slightly modified version of the patch to trunk and enabled the test:
http://svn.apache.org/r1782029
> Reduce reads with overlapping previous documents
> ------------------------------------------------
>
> Key: OAK-5559
> URL: https://issues.apache.org/jira/browse/OAK-5559
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: core, documentmk
> Affects Versions: 1.6.0
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Labels: candidate_oak_1_6, observation, performance
> Fix For: 1.7.0, 1.8
>
> Attachments: cost-of-reading-in-past.png, OAK-5559.patch
>
>
> Reading a node state in a past revision can become expensive when the change
> history in the previous documents have overlapping changes. In this case, the
> changes in the previous documents must be merge sorted to find the correct
> value for the properties on the node. The more overlapping ranges there are,
> the more sorting is needed.
> There is a prominent node in the repository that seems to create quite many
> of those previous documents. The {{/:async}} nodes gets frequent updates and
> is therefore split on a regular basis. Because the properties on this node
> are not all updated at the same time, it is quite likely that previous
> document ranges overlap.
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