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Nikita Timofeev commented on CAY-2412: -------------------------------------- Added warning for this case per https://github.com/apache/cayenne/commit/26330d4cb1edfa66f2c02e32462c85b5101edd6b > 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. > > > -- This message was sent by Atlassian JIRA (v7.6.3#76005)