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https://issues.apache.org/jira/browse/OAK-4518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356913#comment-15356913
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Marcel Reutegger commented on OAK-4518:
---------------------------------------
The problem is caused by the {{docChildrenCache}} in {{DocumentNodeStore}}. The
cache is populated by commits when they exit the commit queue (this is
serialized) and when child nodes are queried. Those two usages are not properly
synchronized and it may happen that a query puts stale data into the cache.
It would be best to remove this cache entirely. In contrast to other caches,
this one is not revision based and hard to maintain. Instead the
DocumentNodeStore must try to reduce queries for child nodes. There is already
an open issue for this: OAK-1322.
> ConcurrentAddReferenceTest fails occasionally
> ---------------------------------------------
>
> Key: OAK-4518
> URL: https://issues.apache.org/jira/browse/OAK-4518
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: core, documentmk
> Affects Versions: 1.4
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Priority: Minor
> Fix For: 1.6
>
> Attachments: OAK-4518-test.patch
>
>
> Occasional test failures have already been reported in OAK-1472, but it still
> fails every now and
> [then|https://travis-ci.org/apache/jackrabbit-oak/builds/140501786].
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