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From "Fateev, Maxim" <>
Subject RE: Paging support
Date Tue, 29 Aug 2006 17:15:05 GMT
AFAIK messages are moved from journal to permantent storage (JDBC) on every checkpoint. The
problem is that references for every message are still kept in memory. 
IMHO it is inherent limitation of MessageStore API as it is defined now. The only way to get
message is by id. And the only way to have id is to keep it in memory.
I'm looking into changing MessageStore API to one that instead of 

Message 	getMessage(MessageId identity) 

Would provide

Message getNextMessage() 

method eliminating need to keep references in memory.

-----Original Message-----
From: Anders Bengtsson [] 
Sent: Tuesday, August 29, 2006 1:23 AM
Subject: Re: Paging support

gnodet wrote:
> If you don' t use any persistent store, messages must be kept in 
> memory, so you are obvisouly limited by the available mem.

Yes, this is what I would expect.

> If you use a jdbc store, messages can be removed from memory and store 
> for later consumption.

Yes, except it doesn't actually work!

It writes things to the store, but it is still very much limited by memory for some reason.
(Someone reported this as AMQ-845 earlier, but with no response).

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