[ZOOKEEPER-3398] Learner.connectToLeader() may take too long to time-out

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.6.0
• Component/s: leaderElection, quorum
• Labels: pull-request-available
• Assignee: Vladimir Ivić
• Reporter: Vladimir Ivić
• Created: 21/May/19 01:39
• Updated: 15/Jul/19 11:11
• Resolved: 12/Jul/19 15:02

Description

After leader election happens, the followers will connect to the leader which is facilitated by the Learner.connectToLeader() method. 

Learner.connectToLeader() is relying on the initLimit configuration value to time-out in case the network connection is unreliable. This config may have a high value that could leave the ensemble retrying and waiting in the state of not having quorum for too long. The follower will retry up to 5 times. 

This patch introduces a new configuration directive that will allow Zookeeper to use different time-out value `connectToLeaderLimit` which then could be set to lower value than `initLimit`.

 

Issue Links

• links to: GitHub Pull Request #953