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https://issues.apache.org/jira/browse/CAY-2412?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nikita Timofeev updated CAY-2412:
---------------------------------
Priority: Minor (was: Major)
> SelectQuery with prefetches and cache bring data losing
> -------------------------------------------------------
>
> Key: CAY-2412
> URL: https://issues.apache.org/jira/browse/CAY-2412
> Project: Cayenne
> Issue Type: Bug
> Components: Core Library
> Affects Versions: 4.0.B1
> Environment: bootique 0.23
> bootique-jetty 0.23
> bootique-jcache 0.23
> bootique-cayenne 0.23
> cayenne-server 4.0.B1
> Reporter: Artyom Kravchenko
> Assignee: Nikita Timofeev
> Priority: Minor
>
> SelectQuery with prefetches and cache bring data losing
> Object model looks like:
>
> {code:java}
> COURSE OneToMany COURSE_CLASSES
> COURSE_CLASSES ManyToOne COLLEGE
> COURSE_CLASSES OneToMany SESSIONS
> COURSE_CLASSES ManyToOne ROOM
> ROOM ManyToOne SITE
> {code}
>
> Select query looks like:
> {code:java}
> List<Course> courses = ObjectSelect.query(Course.class)
> .where(Course.CODE.eq(code))
> .prefetch(Course.COURSE_CLASSES.joint())
> .prefetch(Course.COURSE_CLASSES.dot(CourseClass.COLLEGE).joint())
> .prefetch(Course.COURSE_CLASSES.dot(CourseClass.SESSIONS).joint())
> .prefetch(Course.COURSE_CLASSES.dot(CourseClass.ROOM).joint())
> .prefetch(Course.COURSE_CLASSES.dot(CourseClass.ROOM).dot(Room.SITE).joint())
> .cacheStrategy(LOCAL_CACHE)
> .cacheGroup(Course.class.getSimpleName())
> .selectOne(context);
> {code}
> where
>
> {code:java}
> context
> {code}
>
> is shared readonly instance of cayenne context. It is also used for other
> queries inside our application.
>
> When I iterate through result list
> {code:java}
> courses.get(i).getCourseClasses(){code}
> I see that list of related CourseClasses is trimmed (doesn't contains full
> set of records which expected, some records just lost).
> I am not sure who is blame on it
> - is it prefetch semantic (I have found similar but not exact the same bug
> CAY-2257)
> - some concurrent modifications of related objects list (since we load it in
> shared context)
> - any caching issues (we are using JCache/HECache implementation)
> In additional I can say that we are not limited number of cache entries for
> any cache group, just use 10 min expiry timeout.
> But the main difficulties that I can not reproduce such behaviour locally
> (reproducible on production environment only) so I can not write clear test
> for this issue.
>
>
>
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