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https://issues.apache.org/cayenne/browse/CAY-965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682#action_12682
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Øyvind Harboe commented on CAY-965:
-----------------------------------
(accidentally sent off the previous comment...)
The problem is ObjectIdQuery does not cache the result of the query when there
are no matches, so a query is sent to the database again and again to find out
that there is no matching record...
in snapshots LRUMap there the ObjectId should have an entry that points to Java
null, which is different from no map existing for the ObjectId key.
DataRowStore.getCachedSnapshot(ObjectId) line: 351
DataDomainQueryAction.interceptOIDQuery() line: 174
DataDomainQueryAction.execute() line: 114
DataDomain.onQuery(ObjectContext, Query) line: 740
> Objects that do NOT exist must be cached
> ----------------------------------------
>
> Key: CAY-965
> URL: https://issues.apache.org/cayenne/browse/CAY-965
> Project: Cayenne
> Issue Type: Bug
> Components: Cayenne Core Library
> Affects Versions: 3.0
> Environment: any
> Reporter: Øyvind Harboe
> Assignee: Andrus Adamchik
>
> We're seing that thousands of queries that return 0 rows:
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