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From "Oscar Haeger" <oscar.hae...@sigma.se>
Subject SV: [users@httpd] Split-brain problem.
Date Tue, 08 Apr 2008 08:24:22 GMT
>From my experience with clustering that is when the connection between parts of the clusters
are lost and they can't agree on which one is supposed to keep serving the data. The most
common way around it afaik is to have a priority and heartbeat between the nodes and allow
them to kill each other off (something like STONITH = Shoot The Other Node In The Head) or
similar.
 
So, if we have two servers A and B and a heartbeat (with STONITH) between them and node A
misses a few heartbeats (perhaps a lockup, perhaps something else), then node B will reset
node A and take over that nodes capabilities.
 
This is without reading about Terracotta so things might be different there, but that's the
split-brain problem from my experience.
 
Hope this helps
 
Cheers
 
Oscar

________________________________

Från: Ch Praveena [mailto:ps050202@gmail.com]
Skickat: ti 2008-04-08 09:30
Till: users@httpd.apache.org
Ämne: [users@httpd] Split-brain problem.



Hi all, 

   While going on with Terracotta article, 
-- http://www.terracotta.org/confluence/display/explore/How+Terracotta+Works,
For implementing application server clustering, I found this phrase, "Split-brain problem."..


Please let me know about this in detail.. 



Regards,

Praveena Chalamcharla,
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