TyqITstudent commented on issue #688: reduce session revalidation time after zxid roll over URL: https://github.com/apache/zookeeper/pull/688#issuecomment-473632260 1. Your description is correct. Every half tickTime, Leader will send ping packet to Followers, and followers will send sessions stored in touchTable. 2. Yes, your comprehension is correct. Every half tickTime, all sessions in Follower touchTable will be sent to Leader to revalidate. If the sessions which need to be revalidated now are not expired after half tickTime, we can send them to Leader with ping packets. You get my idea. 3. Perhaps your idea is much better. But we hope we can revalidate sessions as quickly as possible. For example, if the revalidate request is sent at timeA; at timeA+6s，it is revalidated by Leader. Perhaps it is expired at that time.
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