[RATIS-758] Illegal state transition in LeaderElection: RUNNING to CLOSED

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Component/s: server
• Labels: ozone
• Target Version/s: 0.5.0
• Assignee: Attila Doroszlai
• Reporter: Attila Doroszlai
• Created: 20/Nov/19 06:42
• Updated: 22/Nov/19 06:46
• Resolved: 22/Nov/19 01:06

Description

Observed the following illegal state transition (using Ratis 0.5.0-d6d58d0-SNAPSHOT):

2019-11-19 22:57:04,604 INFO impl.RoleInfo: 0b15f105-b523-4d80-ad5c-5dd005e74db0: start LeaderElection
2019-11-19 22:57:04,605 INFO impl.RaftServerImpl: 0b15f105-b523-4d80-ad5c-5dd005e74db0@group-3FF25090045A: changes role from CANDIDATE to FOLLOWER at term 3 for recognizeCandidate:ed65d927-a26b-4755-87c9-8340ec30b69f
2019-11-19 22:57:04,612 INFO impl.RoleInfo: 0b15f105-b523-4d80-ad5c-5dd005e74db0: shutdown LeaderElection
Exception in thread "0b15f105-b523-4d80-ad5c-5dd005e74db0@group-3FF25090045A-LeaderElection4" java.lang.IllegalStateException: ILLEGAL TRANSITION: In 0b15f105-b523-4d80-ad5c-5dd005e74db0@group-3FF25090045A-LeaderElection4, RUNNING -> CLOSED
	at org.apache.ratis.util.Preconditions.assertTrue(Preconditions.java:63)
	at org.apache.ratis.util.LifeCycle$State.validate(LifeCycle.java:123)
	at org.apache.ratis.util.LifeCycle.transition(LifeCycle.java:143)
	at org.apache.ratis.server.impl.LeaderElection.run(LeaderElection.java:151)

Issue Links

• is related to: RATIS-578 Illegal State transition in LeaderElection
• links to: GitHub Pull Request #48