[jbosscache-dev] Notifications during state transfer WAS: [JBossCache] - Replication and notifications

[Brian Stansberry]

I'm sure this is discussed on a thread if someone wants to search. :)

I'm lazy so I'll just guess about the reason. Going through the 
interceptor chain adds all sorts of possibly unwanted side effects; e.g. 
creation of in-memory nodes cause writes to persistent store, 
replication, gravitation, etc.  Many can be eliminated by setting 
options, but thinking through all the ways it can break will take a lot 
of work and it will inherently be fragile.

Manik's right though; my question was about the Node Modified bit. :)

Vladimir Blagojevic wrote:
> There was a reason we did not go through interceptor chain; I remember 
> it well; but what it was - kill me - I cannot recall.
> 
> Brian Stansberry wrote:
>> State transfer doesn't go through the interceptor chain when it 
>> creates nodes; it just builds up a tree.  IIRC we decided to 
>> specifically code in a Node Created notification; perhaps we just 
>> didn't think about Node Modified?  Vladimir, your memory any better?
>>
>> Manik Surtani wrote:
>>> Not sure if this is a feature or a bug.  Brian/Vladimir, do you 
>>> recall whether Node Modified notifications were specifically 
>>> suppressed during state transfer, and if so, why?
>>>
>>> Cheers
>>> Manik
>>>
>>> Begin forwarded message:
>>>
>>>> From: aditsu <do-not-reply at jboss.com>
>>>> Date: 13 November 2007 09:14:11 GMT
>>>> To: manik.surtani at jboss.com
>>>> Subject: [JBossCache] - Replication and notifications
>>>>
>>>> Hi, I'm using JBC 2.0.0.GA (core)
>>>> I set up 2 caches with REPL_SYNC and memory state fetching, and I 
>>>> added a listener to the 2nd cache before starting it.
>>>> It looks like when fetching the memory state, the cache only fires 
>>>> NODE_CREATED notifications, which contain no data. However, when I 
>>>> put a new node afterwards, in either cache instance, I get a 
>>>> NODE_CREATED followed by a NODE_MODIFIED with the node data map.
>>>> Is there a way to get the data while it is being fetched from a 
>>>> replicated cache?
>>>>
>>>> Thanks
>>>> Adrian
>>>>
>>>> View the original post : 
>>>> http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4103974#4103974 
>>>>
>>>>
>>>> Reply to the post : 
>>>> http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4103974 
>>>>
>>>
>>> -- 
>>> Manik Surtani
>>> Lead, JBoss Cache
>>> manik at jboss.org
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> jbosscache-dev mailing list
>>> jbosscache-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/jbosscache-dev
>>
> 

-- 
Brian Stansberry
Lead, AS Clustering
JBoss, a division of Red Hat
brian.stansberry at redhat.com