Indirect probe described as below. After every T time units, a process 
Miselects 
a random process from its membership list - say Mj - and sends a *ping* to 
it. It then waits from an *ack* fromMj.If it does not receive the *ack* within 
the pre-specified timeout, Miindirectly probes Mj by randomly selecting k 
targets 
and uses them to send a *ping* to Mj. Each of these k targets then sends a 
*ping* toMj on behalf of Mi and on receiving an *ack*notifies Mi. If, for 
some reason, none of these processes receive an *ack*, Mi declares Mj as 
failed and hands off the update to the dissemination component.

<http://prakhar.me/images/swim.png>

Detail is in here <http://prakhar.me/articles/swim/>


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