[hibernate-issues] [Hibernate-JIRA] Resolved: (HSEARCH-782) Unnecessary loading of @ContainedIn entities causes big performance hit

[Sanne Grinovero (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-782?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sanne Grinovero resolved HSEARCH-782.
-------------------------------------

    Resolution: Fixed

> Unnecessary loading of @ContainedIn entities causes big performance hit
> -----------------------------------------------------------------------
>
>                 Key: HSEARCH-782
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-782
>             Project: Hibernate Search
>          Issue Type: Bug
>          Components: engine
>    Affects Versions: 3.4.0.Final
>         Environment: Hibernate 3.6.3
> MS SQL Server 2005
>            Reporter: Adam Harris
>            Assignee: Sanne Grinovero
>             Fix For: 3.4.1, 4.0.0.Alpha1
>
>         Attachments: log4j.properties, optimizations.zip, org.hibernate.search.test.engine.optimizations.CollectionUpdateEventTest2-output.txt
>
>
> This bug is somewhat related to HSEARCH-679 where I have added some comments.  
> Here is a simplified model:
> {code:title=A.java|borderStyle=solid}
> public class A {
>     @Field
>     private String name;
>     @ContainedIn
>     private Collection<B> b;
> }
> {code}
> {code:title=B.java|borderStyle=solid}
> @Indexed
> public class B {
>     @Field 
>     private String name;
>     @IndexEmbedded
>     private A a;
> }
> {code}
> The basic problem is that every time a new instance of B is created and added to A's collection, all of the B instances in that collection have their index recreated.  The reason this is a problem is that nothing in A has changed (e.g. the "name" field).  There is no new information to add to all of the B indexes.  As the number of objects in the collection grows, this becomes are real performance hit.
> It seemed like HSEARCH-679 was trying to address this problem, but this may be a little different scenario.
> I'm attaching some sample code and my log file that demonstrates the extra index events.  Please see line 519 of the surefire log file.

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