In this basic peer-to-peer topology, each server Java Virtual Machine (JVM)
can:
The basic peer-to-peer (both client and server function, or both mode) topology is the default configuration and has a single replica. However, you can also add additional replicas by configuring the replication domain.
In this basic peer-to-peer topology, each server Java Virtual Machine (JVM)
can:
This configuration represents the most consolidated topology, where the various system parts are collocated and requires the fewest server processes. When using this configuration, the most stable implementation is achieved when each node has equal capabilities (CPU, memory, and so on), and each handles the same amount of work.
It is also important to note that when using the peer-to-peer topology, that one session replication backup must run at all times for invalidation to occur. For example, if you have a cluster of 2 application servers, server1 and server2, that are both configured in the peer-to-peer mode and server2 goes down. All of backup information for server1 is lost and those sessions are no longer invalidated properly.
New feature: A
new feature called session hot failover has been added to this release. This
feature is only applicable to the peer-to-peer mode. In a clustered environment,
session affinity in the WebSphere Application Server plug-in routes the requests
for a given session to the same server. If the current owner server instance
of the session fails, then the WebSphere Application Server plug-in routes
the requests to another appropriate server in the cluster. For a cluster configured
to run in the peer-to-peer mode this feature causes the plug-in to failover
to a server that already contains the backup copy of the session, therefore
avoiding the overhead of session retrieval from another server containing
the backup. However, hot failover is specifically for servant region failures.
When an entire server, meaning both controller and server fail, sessions may
have to be retrieved over the network.newfeat
You must
upgrade all WebSphere Application Server plug-in instances that front the
Application Server cluster to version 6.0 to ensure session affinity when
using the peer-to-peer mode.