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From hal...@pvv.ntnu.no
Subject Re: query cloneViaSerialization
Date Tue, 10 May 2011 21:08:15 GMT
One more thing. In this single jstack output, there are 15 threads/stacks
doing Util.cloneViaSerialization like the stack below!

 - Tore.

> Hello.
>
> In the jstack-output I am looking at now, there are several threads doing
> a Util.cloneViaSerialization on some basic prefetching for a SelectQuery.
> Down the java.io.ObjectOutputStream road there is some locking going on.
> Is Util.cloneViaSerialization really needed here? This is with 3.1M2.
>
> Regards,
>  - Tore.
>
> "qtp1661944297-498" prio=10 tid=0x00007f48d0189000 nid=0x51ec in
> Object.wait() [0x00007f48c37f4000]
>    java.lang.Thread.State: WAITING (on object monitor)
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <0x00007f49bb212090> (a
> java.io.ObjectStreamClass$EntryFuture)
> 	at java.lang.Object.wait(Object.java:485)
> 	at java.io.ObjectStreamClass$EntryFuture.get(ObjectStreamClass.java:371)
> 	- locked <0x00007f49bb212090> (a java.io.ObjectStreamClass$EntryFuture)
> 	at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:305)
> 	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1114)
> 	at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
> 	at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
> 	at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
> 	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
> 	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
> 	at org.apache.cayenne.util.Util.cloneViaSerialization(Util.java:346)
> 	at
> org.apache.cayenne.query.BaseQueryMetadata.setPrefetchTree(BaseQueryMetadata.java:332)
> 	at
> org.apache.cayenne.query.SelectQuery.setPrefetchTree(SelectQuery.java:416)
> 	at
> org.apache.cayenne.query.SelectQueryPrefetchRouterAction.startDisjointPrefetch(SelectQueryPrefetchRouterAction.java:116)
> 	at
> org.apache.cayenne.query.SelectQueryPrefetchRouterAction.startUnknownPrefetch(SelectQueryPrefetchRouterAction.java:135)
> 	at
> org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:173)
> 	at
> org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:179)
> 	at
> org.apache.cayenne.query.SelectQueryPrefetchRouterAction.route(SelectQueryPrefetchRouterAction.java:54)
> 	at
> org.apache.cayenne.query.SelectQuery.routePrefetches(SelectQuery.java:179)
> 	at org.apache.cayenne.query.SelectQuery.route(SelectQuery.java:169)
> 	at
> org.apache.cayenne.access.DataDomainQueryAction.runQuery(DataDomainQueryAction.java:414)
> 	at
> org.apache.cayenne.access.DataDomainQueryAction.access$000(DataDomainQueryAction.java:69)
> 	at
> org.apache.cayenne.access.DataDomainQueryAction$2.transform(DataDomainQueryAction.java:395)
> 	at
> org.apache.cayenne.access.DataDomain.runInTransaction(DataDomain.java:824)
> 	at
> org.apache.cayenne.access.DataDomainQueryAction.runQueryInTransaction(DataDomainQueryAction.java:392)
> 	at
> org.apache.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:121)
> 	at
> org.apache.cayenne.access.DataDomain.onQueryNoFilters(DataDomain.java:706)
> 	at
> org.apache.cayenne.access.DataDomain$DataDomainQueryFilterChain.onQuery(DataDomain.java:944)
> 	at org.apache.cayenne.access.DataDomain.onQuery(DataDomain.java:696)
> 	at
> org.apache.cayenne.util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:336)
> 	at
> org.apache.cayenne.util.ObjectContextQueryAction.executePostCache(ObjectContextQueryAction.java:104)
> 	at
> org.apache.cayenne.util.ObjectContextQueryAction.execute(ObjectContextQueryAction.java:91)
> 	at org.apache.cayenne.access.DataContext.onQuery(DataContext.java:983)
> 	at
> org.apache.cayenne.access.DataContext.performQuery(DataContext.java:972)
>
>
>
>



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