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https://issues.apache.org/jira/browse/ZOOKEEPER-928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930800#action_12930800
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Flavio Junqueira commented on ZOOKEEPER-928:
--------------------------------------------
My understanding is that SO_TIMEOUT also affects SocketChannel, since it builds
on top of a Socket object.
> Follower should stop following and start FLE if it does not receive pings
> from the leader
> -----------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-928
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-928
> Project: Zookeeper
> Issue Type: Bug
> Components: quorum, server
> Affects Versions: 3.3.2
> Reporter: Vishal K
> Priority: Critical
>
> In Follower.followLeader() after syncing with the leader, the follower does:
> while (self.isRunning()) {
> readPacket(qp);
> processPacket(qp);
> }
> It looks like it relies on socket timeout expiry to figure out if the
> connection with the leader has gone down. So a follower *with no cilents*
> may never notice a faulty leader if a Leader has a software hang, but the TCP
> connections with the peers are still valid. Since it has no cilents, it won't
> hearbeat with the Leader. If majority of followers are not connected to any
> clients, then FLE will fail even if other followers attempt to elect a new
> leader.
> We should keep track of pings received from the leader and see if we havent
> seen
> a ping packet from the leader for (syncLimit * tickTime) time and give up
> following the
> leader.
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