[Piranha]How to detect stalemate condition

[SHIBATA, Makoto]

How to detect stalemate condition ?

http://www.redhat.com/docs/manuals/haserver/RHHAS-1.0-Manual/x3488.html

When I unplug the primary node, failover occurs.
And I plug back the promary node, 
I want to prevent fail back to primary node.

Can I detect stalemate condition ?
Is there any good timing to stop primary node service ?

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Makoto Shibata