[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3392) Query Cache entries are not distributable

Query Cache entries are not distributable ----------------------------------------- Key: HHH-3392 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3392 Project: Hibernate3 Issue Type: Bug Components: caching (L2) Affects Versions: 3.3.0.CR1 Environment: Any Reporter: Greg Luck Attachments: HHH-3392-Branch_3_3.patch, HHH-3392-trunk.patch Steve It will correct the issue we saw. On 17/06/2008, at 1:50 AM, Steve Ebersole wrote: I'm asking for confirmation that said change does in fact correct the issue :) If it does I'll make the change in Hibernate... On Mon, 2008-06-16 at 17:42 +1000, Greg Luck wrote: Steve Thanks. Why don't you make the change in Hibernate? On 14/06/2008, at 2:40 PM, Steve Ebersole wrote: Considering that RootEntityResultTransformer is not performing an kind of data uniqueing (singleton, etc) then yes that would be an issue. There is nothing wrong with caching a query which uses a ResultTransformer per-se. As simple test would be to add an equals() override to RootEntityResultTransformer where the class of the operands are evaluated: public boolean equals(Object other) { // all RootEntityResultTransformers are considered equal return other != null && RootEntityResultTransformer.class.isInstance( other ) } On Tue, 2008-06-10 at 14:35 +1000, Greg Luck wrote: Steve I have a question from a Hibernate/Ehcache user. When he replicates a cached Query it does not get hit on the second box. I can see what the trouble is: the key includes an object reference to a RootEntityResultTransformer: ; transformer: org.hibernate.transform.RootEntityResultTransformer@a725aa, value=[4968486262001664, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10], version=1, hitCount=0, CreationTime = 1213009341528, LastAccessTime = 0 ] So, this cannot work. How does this work for any distributed cache? Begin forwarded message: From: alvins <alvins1982(a)hotmail.com&gt; Date: 9 June 2008 9:26:38 PM To: ehcache-list(a)lists.sourceforge.net Subject: [ehcache-list] Distributed ehcache - queries I am having some problems with ehcache in distributed mode and queries. I have a simple spring+hibernate+ehcache webapp running on two tomcat servers. I have enabled second level caching and I can see my simple pojo gets replicated back and forth fine between the two servers. The query caching seems to work fine if I have a single server started. I can see that is using the cached query and not hitting the db. However what I am trying to test is if I have two boxes - box1 does query and populates cache which gets replicated to box2 - then box2 doesn't need to do query since its in cache. My problem is that the query from box1 is not recognized as being the same as on box2 - it seems to get cached multiple times. Below is a log snippet of the two objects which are in my query cache - there should only be one. The first debug line is showing a query object which was replicated over from another box - the second line is showing a query object which was populated locally. This should not happen since they are the same query. 21:03:39,763 DEBUG net.sf.ehcache.store.MemoryStore - findTopXCache: findTopXMemoryStore hit for sql: select this_.emp_id as emp1_2_0_, this_.emp_firstname as emp2_2_0_, this_.emp_surname as emp3_2_0_ from Employee this_; parameters: ; first row: 0; max rows: 10; transformer: org.hibernate.transform.RootEntityResultTransformer@a725aa LOCAL: [ key = sql: select this_.emp_id as emp1_2_0_, this_.emp_firstname as emp2_2_0_, this_.emp_surname as emp3_2_0_ from Employee this_; parameters: ; first row: 0; max rows: 10; transformer: org.hibernate.transform.RootEntityResultTransformer@a725aa, value=[4968486262001664, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10], version=1, hitCount=0, CreationTime = 1213009341528, LastAccessTime = 0 ] 21:03:39,763 DEBUG net.sf.ehcache.store.MemoryStore - findTopXCache: findTopXMemoryStore hit for sql: select this_.emp_id as emp1_2_0_, this_.emp_firstname as emp2_2_0_, this_.emp_surname as emp3_2_0_ from Employee this_; parameters: ; first row: 0; max rows: 10; transformer: org.hibernate.transform.RootEntityResultTransformer@aa11a6 LOCAL: [ key = sql: select this_.emp_id as emp1_2_0_, this_.emp_firstname as emp2_2_0_, this_.emp_surname as emp3_2_0_ from Employee this_; parameters: ; first row: 0; max rows: 10; transformer: org.hibernate.transform.RootEntityResultTransformer@aa11a6, value=[4968486194896896, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10], version=1, hitCount=5, CreationTime = 1213009325003, LastAccessTime = 1213009415332 ] Does anybody have any ideas? -- View this message in context: http://www.nabble.com/Distributed-ehcache---queries-tp17730904p17730904.html Sent from the Ehcache mailing list archive at Nabble.com. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ ehcache-list mailing list ehcache-list(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ehcache-list Regards Greg Luck web: http://gregluck.com skype: gregrluck yahoo: gregrluck mobile: +61 408 061 622 Regards Greg Luck web: http://gregluck.com skype: gregrluck yahoo: gregrluck mobile: +61 408 061 622 Regards Greg Luck web: http://gregluck.com skype: gregrluck yahoo: gregrluck mobile: +61 408 061 622