Marcel Reutegger created OAK-5559:
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Summary: 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
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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