[ZOOKEEPER-3936] Zxid mismatch after new node becomes the leader

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.5.8
• Assignee: Unassigned
• Reporter: Badai Aqrandista
• Created: 15/Sep/20 02:15
• Updated: 20/Sep/20 09:51

Description

Adding 2 nodes to 3 nodes ensemble with the following steps:

1. Start the new nodes (node 4, 5) and let them join the ensemble
2. Update existing nodes' configuration (node 1, 2, 3) to add the new nodes addresses and ports
3. Rolling restart the existing nodes
4. Stop the current leader (node 2)
5. New node (node 5) becomes leader

After this, zxid in the new leader (node 5) becomes the same as the old leader (node 2).

badai@192-168-1-129 3 % grep -i zxid logs-zk*/logs/before/*stat*
logs-zk1/logs/before/zk-1-stat-before-crash.log:Zxid: 0xe0000050c
logs-zk2/logs/before/zk-2-stat-before-crash.log:Zxid: 0xf00000000
logs-zk3/logs/before/zk-3-stat-before-crash.log:Zxid: 0xe0000050c
logs-zk4/logs/before/zk-4-stat-before-crash.log:Zxid: 0xe0000050c
logs-zk5/logs/before/zk-5-stat-before-crash.log:Zxid: 0xf00000000
badai@192-168-1-129 3 %

Please ignore the "before" wording on the logs name as they are irrelevant.