Thanks for the reply. So far I do like the Shoal project and its messaging. I was trying to download the 1.1 binaries but it is a broken link. Is there a way to get the jars for 1.1? Also is there a roadmap so I can get a feel for when 1.1 will be released? I didn't see any roadmap information on the site.
Thanks,
Doal Miller
From: Shreedhar.Ganapathy_at_Sun.COM [mailto:Shreedhar.Ganapathy_at_Sun.COM]
Sent: Thursday, May 21, 2009 5:50 PM
To: dev_at_shoal.dev.java.net
Cc: Doal Miller; users_at_shoal.dev.java.net; Mahesh Kannan
Subject: Re: [Shoal-Dev] Question about Synchronization of the Distributed State Cache
Hi Doal
Thanks for posting here.
The current implementation does not have any support at the moment for synchronization of the kind you are looking for. In fact its a very simple share-all cache with last writer overwriting any previous writes. It is also only tested to a limited extent to support lightweight cache writes and is not suitable for high throughput writes. I admit our focus has been a lot on the group composition and lifecycle correctness and these aspects are only now beginning to be looked at.
That said, we are looking to significantly improve the Cache functionality in the next Shoal rev (version 2.0 - Feb-March 2010 release timeframe) to provide on-demand caches with configurable policies. We are at the requirement gathering stage at this point and would welcome any inputs in this respect.
From your description, we would need to ensure message ordering guarantees, configurable distributed locking at row, rowset or table level, etc.
--Shreedhar
Doal Miller wrote:
I have been looking at Shoal for some clustering functions for an upcoming project. The question I have is can a member synchronize the DSC so it is ensured that only one member is changing the cache at any given time.
I thought I might be able to use fencing for this but I see that it doesn't stop changes to the DSC, and is specifically for node recovery.
Is there some way to synchronize changes to the DSC or do you have any ideas?
I appreciate your help, thanks,
Doal Miller
doal.miller_at_mir3.com<mailto:doal.miller_at_mir3.com>
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