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https://issues.apache.org/jira/browse/ZOOKEEPER-3169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16671129#comment-16671129
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田毅群 commented on ZOOKEEPER-3169:
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I have closed the jira ZOOKEEPER-3168. And later I will give you a detailed
document to explain.
> Reduce session revalidation time after zxid roll over
> -----------------------------------------------------
>
> Key: ZOOKEEPER-3169
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3169
> Project: ZooKeeper
> Issue Type: Improvement
> Affects Versions: 3.4.5, 3.5.0
> Reporter: 田毅群
> Priority: Major
> Fix For: 3.4.5
>
>
> 1. Sometimes Zookeeper cluster will receive a lot of connections from
> clients, sometimes connection number even exceeds 1W. When zxid rolls over,
> the clients will reconnect and revalidate the session.
> 2. In Zookeeper design structure, when follower server receives the session
> revalidation requests, it will send requests to leader server, which is
> designed to be responsible for session revalidation.
> 3. In a short time, Leader will handle lots of requests. I use a tool to
> get the statistics, some clients need to wait over 20s. It is too long for
> some special clients, like ResourceManager.
> 4. I design a thought: when zxid rollover happens. Leader will record the
> accurate time. When reelection finishs, all servers will get the rollover
> time. When clients reconnect and revalidate session. All servers can judge
> it. So it can reduce a lots of pressure of cluster, all clients can will
> wait for less time.
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