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https://issues.apache.org/jira/browse/CAY-1868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Artyukevich updated CAY-1868:
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Attachment: cay1868v3_1.patch
Hi, Andrus. Send another one patch for Cayenne 3.1 . Changes in synchronized
methods of ObjRelationship class.
> Select contention with multiple contexts
> -----------------------------------------
>
> Key: CAY-1868
> URL: https://issues.apache.org/jira/browse/CAY-1868
> Project: Cayenne
> Issue Type: Bug
> Affects Versions: 3.1B2, 3.2M1
> Reporter: Andrus Adamchik
> Assignee: Andrus Adamchik
> Fix For: 3.1B3, 3.2.M2
>
> Attachments: cay1868.patch, cay1868v3_1.patch
>
>
> I am mostly using local cache and a single app-scoped ObjectContext for
> selects. So I was oblivious to this issue. Today I tried shared cache and a
> pool of app-scoped ObjectContexts randomly assigned to requests. I quickly
> hit a contention point:
>
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.cayenne.map.ObjRelationship.refreshFromDeferredPath(ObjRelationship.java:572)
> - waiting to lock <0x424bf840> (a
> org.apache.cayenne.map.ObjRelationship)
> at
> org.apache.cayenne.map.ObjRelationship.isToMany(ObjRelationship.java:431)
> at
> org.apache.cayenne.map.ObjRelationship.isOptional(ObjRelationship.java:310)
> at
> org.apache.cayenne.map.ObjRelationship.isSourceDefiningTargetPrecenseAndType(ObjRelationship.java:346)
> at
> org.apache.cayenne.access.DataDomainQueryAction.interceptRelationshipQuery(DataDomainQueryAction.java:239)
> ObjRelationship recalculating its 'toMany' value on every call is evil by
> itself. Doing parts of it in a synchronized block is completely unacceptable.
>
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