public ClientCacheFactory setPoolSubscriptionAckInterval(int ackInterval) {
    getPoolFactory().setSubscriptionAckInterval(ackInterval);
    return this;
  }
Sets the interval in milliseconds to wait before sending acknowledgements to the cache server
for events received from the server subscriptions.

@param ackInterval number of milliseconds to wait before sending event acknowledgements.
@return a reference to <code>this</code>
@throws IllegalArgumentException if <code>ackInterval</code> is less than or equal to
        <code>0</code>.
geode-core/src/main/java/org/apache/geode/cache/client/ClientCacheFactory.java