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From "Corin Moss" <>
Subject RE: JCS Based Cache
Date Tue, 02 Mar 2004 07:59:15 GMT

You have a good point there - I'm simply going to have to replace the DefaultPersistentStore
at my end (for testing only of course ;)

One thing that has occurred to me whilst hammering the JISP based store, and looking at the
code in a bit more depth, is that all of the perceived problems come as a result of the incredibly
high iowait generated whilst accessing the store (mostly while writing I think.)  I notice
that the AbstractReadWriteStore within the Excalibur components uses FIFOReadWriteLock as
the lock - has anyone got much experience with this?  If there's a bug in there, it's possible
that it's not relinquishing locks properly - which would most likely manifest in very high
iowait (I theorise ;) I know that there are known issues with our version of JISP, but I'd
like to be reassured first-hand that the read/write lock implementation we're currently using
is totally robust.

JCS does have its own R/W lock of course - but I'd love not to have to change too many classes



-----Original Message-----
From: Bertrand Delacretaz []
Sent: Tuesday, 2 March 2004 8:45 p.m.
Subject: Re: JCS Based Cache

Le Mardi, 2 mars 2004, à 08:16 Europe/Zurich, Corin Moss a écrit :

> ... I guess conceptually this really belongs within the
> Avalon-Excalibur-store framework, as it will sit along side
> AbstractJispFilesystemStore rather than on top of it...

Makes sense but I don't think it prevents you from implementing a Store
in the Cocoon source tree for now, like the (broken AFAIK) which simply
extends AbstractFilesystemStore.

It can always be moved to Avalon later on if needed, but it might be
easier to work on it "here" for now.

What I don't see is how you can configure a different Store than the
DefaultPersistentStore, have you figured this out already? Cocoon uses
DefaultPersistentStore by default but I didn't find where this is


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