One important parameter you should set when creating a session is the session timeout,
which is the amount of time the ZooKeeper service allows a session before declaring it
expired. If the service does not see messages associated to a given session during time
t, it declares the session expired. On the client side, if it has heard nothing from the
server at 1/3 of t, it sends a heartbeat message to the server. At 2/3 of t, the ZooKeeper
client starts looking for a different server, and it has another 1/3 of t to find one.
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