[ZOOKEEPER-3842] Rolling scale up of zookeeper cluster does not work with reconfigEnabled=false

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Duplicate
• Affects Version/s: 3.6.1, 3.5.8
• Fix Version/s: 3.5.9, 3.7.0, 3.6.2
• Component/s: quorum, server
• Labels: features
• Flags: Important
• Assignee: Mate Szalay-Beko
• Reporter: kaushik srinivas
• Created: 21/May/20 07:33
• Updated: 10/Sep/20 10:43
• Resolved: 03/Jun/20 08:02

Description

With 
reconfigEnabled = false (not explicitly setting, relying on the default value).
 
Install 3 zookeeper servers with 3 zk information in all the 3 zookeeper quorum servers.
 
Do a rolling scale up of cluster from 3 to 5 with below steps.
 
1. Install 4th zookeeper with servers list of 1,2,3,4,5
2. Install 5th zookeeper with servers list of 1,2,3,4,5
3. Do a rolling restart of servers 1 2 & 3 with servers list of 1,2,3,4,5.
 
Result/Behavior: quorum is lost.
 
With this https://issues.apache.org/jira/browse/ZOOKEEPER-2819
description points at a PR https://github.com/apache/zookeeper/pull/292
which should have this issue of rolling restart fixed without dynamic reconfiguration feature enabled.
 
We still see quorum loss issues without dynamic reconfig feature enabled.
 
 

Issue Links

• duplicates: ZOOKEEPER-3829 Zookeeper refuses request after node expansion