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https://issues.apache.org/jira/browse/OAK-591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger resolved OAK-591.
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Resolution: Fixed
Fix Version/s: 0.7
Applied most recent patch in revision: 1447645
> Improve KernelNodeStore cache efficiency
> ----------------------------------------
>
> Key: OAK-591
> URL: https://issues.apache.org/jira/browse/OAK-591
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: core
> Affects Versions: 0.6
> Reporter: Marcel Reutegger
> Fix For: 0.7
>
> Attachments: mk-log-current.txt, mk.log.gz, mk-log-patched.txt,
> OAK-591.patch, OAK-591.patch, OAK-591.patch
>
>
> The cache in KernelNodeStore references entries with a path+revision combo.
> This mapping quickly becomes inefficient when there are writes on the
> repository. Whenever something is changed, the complete cache basically
> becomes invalid and oak-core needs to re-fetch nodes again, even though they
> didn't change. The attached test shows this behaviour. The test initially
> creates 10 nodes and lets a thread read those nodes repeatedly. To make the
> test somewhat realistic the reader acquires a new session in every run
> through the loop. This is to simulate e.g. a request which acquires a new
> session every time (Apache Sling does it that way). At the same time writes
> occur but in a separate part of the repository. As can be seen in the logs,
> the nodes are read from the MicroKernel whenever something changes anywhere
> in the repository. Obviously this is no limited to the test nodes. The log
> also shows repeated reads to node type, user and index nodes. None of them
> change while the test runs.
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