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From Richard Monson-Haefel <Rich...@Monson-Haefel.com>
Subject Re: [clustering] automatic partitoning, state bucketing, etc... (long)
Date Mon, 18 Aug 2003 08:24:12 GMT
Here's my 2 cents ...

Lets keep it as simple as possible by using sticky sessions and a single
node failover.  In other words, every node has one buddy to which it
replicates state, but each session is assigned to a single node and only in
the event of a node failure, does a session move to the buddy node. If both
buddies fail, the session is lost. Buddies can form dynamically as nodes are
brought on line and should favor partnerships with nodes on different
hardware -- to avoid loosing both buddies in a hardware failure.

IMO, this is the most straight forward solution and the easiest to build and
maintain. It also avoids the chattiness of multi-node replication and the
single point of failure associated with shared store.  The one problem with
this solution, IMO, is that you have to deploy clusters in twos - every node
needs to have a buddy if you want failover.  Loads are balanced using a
round robin approach at the start of a session.



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