Follower should stop following and start FLE if it does not receive pings from
the leader
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Key: ZOOKEEPER-928
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-928
Project: Zookeeper
Issue Type: Bug
Affects Versions: 3.3.2
Reporter: Vishal K
Fix For: 3.4.0
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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