Bugs item #569077, was opened at 2002-06-14 11:17
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=376685&aid=569077&group_id=22866

Category: JBossCMP
Group: CVS HEAD
Status: Open
Resolution: None
Priority: 5
Submitted By: Michael Newcomb (mnewcomb)
Assigned to: Nobody/Anonymous (nobody)
Summary: read-ahead issues

Initial Comment:
I'm submitting this to keep track of some issues that 
have arisen with the rewrite of the read-ahead code.

Most of the problems I am encountering have to deal 
with very large sets of data (to the tune of 10k+ entity 
beans).

I'm just gonna give a quick summary of the problems, 
but if you are interested in the details, I can forward the 
e-mail thread between Dain and myself discussing the 
problems.

Summary:
1. Replacing FinderResults with a List indirectly causes 
a large amount of compares to occur when working 
with 'listMap' because FinderResults.equals was just 
doing identity comparison as opposed to List.equals 
which starts walking the list comparing values.

2. Relationship read-aheads and finder read-aheads 
share the same 'listMap'.  So, if a bean is found in a 
read-ahead and then in a relationship, the results keep 
getting replaced with the last accessed one.

Michael


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http://sourceforge.net/tracker/?func=detail&atid=376685&aid=569077&group_id=22866

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