[Hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1813) 2nd level cached collections are locked causing a cache miss

[Assaf B. (JIRA) <no...@at...>]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1813?page=comments#action_23267 ] 

Assaf Berg commented on HHH-1813:
---------------------------------

By the way, if I load the same entity 5 times in a row I will get 5 misses on its collection. Using nonstrict-read-write strategy I get 1 miss and 4 hits, which is better but I expect the first load to hit as well because I've just inserted this entity.

> 2nd level cached collections are locked causing a cache miss
> ------------------------------------------------------------
>
>          Key: HHH-1813
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1813
>      Project: Hibernate3
>         Type: Bug

>     Versions: 3.1
>  Environment: Hibernate 3.1, Oracle 10g, Linux
>     Reporter: Assaf Berg
>     Priority: Critical
>  Attachments: testcase.tar.gz
>
>
> Using the second level cache, collections are fetched from the database due to the cached item being locked.
> This happens in the most simple use case:
> 1. Insert an entity with a collection
> 2. Commit. 
> 3. Fetch the entity
> I've written a simple test case and see the following in the log file:
> 11:52:47,159 DEBUG [ReadWriteCache] Invalidating: domain.Cat.kittens#539957
> 11:52:47,177 DEBUG [ReadWriteCache] Inserting: domain.Cat#539957
> 11:52:47,179 DEBUG [ReadWriteCache] Inserted: domain.Cat#539957
> 11:52:47,180 DEBUG [ReadWriteCache] Inserting: domain.Kitten#540214
> 11:52:47,180 DEBUG [ReadWriteCache] Inserted: domain.Kitten#540214
> 11:52:47,181 DEBUG [ReadWriteCache] Releasing: domain.Cat.kittens#539957
> 11:52:49,221 DEBUG [ReadWriteCache] Caching: domain.Cat#539957
> 11:52:49,221 DEBUG [ReadWriteCache] Item was already cached: domain.Cat#539957
> 11:52:49,223 DEBUG [ReadWriteCache] Cache lookup: domain.Cat.kittens#539957
> 11:52:49,223 DEBUG [ReadWriteCache] Cached item was locked: domain.Cat.kittens#539957
> 11:52:49,229 DEBUG [ReadWriteCache] Caching: domain.Kitten#540214
> 11:52:49,229 DEBUG [ReadWriteCache] Item was already cached: domain.Kitten#540214
> 11:52:49,230 DEBUG [ReadWriteCache] Caching: domain.Cat.kittens#539957
> 11:52:49,231 DEBUG [ReadWriteCache] Cached: domain.Cat.kittens#539957
> domain.Cat.kittens [C/H/M/P]: 1/0/1/1
> domain.Cat [C/H/M/P]: 1/0/0/1
> domain.Kitten [C/H/M/P]: 1/0/0/1
> This happens whether the collection is mapped as inverse or not.
> I've attached the test case source and hbms (although it might need to be tweaked for the proper DB before running, and I didn't include the dependencies JARs).
> Here's a code excerpt of the interesting part (tx is TransactionTemplate using HibnerateTransactionManager and hibernate is HibernateTemplate from the spring framework):
> 		tx.execute(new TransactionCallback() {
> 			public Object doInTransaction(TransactionStatus status) {
> 				// create a Cat with one Kitten
> 				Cat cat = new Cat();
> 				Kitten kitten = new Kitten();
> 				cat.addKitten(kitten);
> 				
> 				hibernate.save(cat);
> 				
> 				return null;
> 			}			
> 		});
> 		
> 		Thread.sleep(2000L);
> 		
> 		tx.execute(new TransactionCallback() {
> 			public Object doInTransaction(TransactionStatus status) {
> 				// load all cats
> 				List<Cat> allCats = hibernate.loadAll(Cat.class);
> 				return null;
> 			}
> 		});
> I can supply further information if needed.

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