[ZOOKEEPER-3141] testLeaderElectionWithDisloyalVoter is flaky

• Type: Sub-task
• Status: Reopened
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.6.0
• Component/s: leaderElection, server, tests
• Assignee: Unassigned
• Reporter: Michael Han
• Created: 10/Sep/18 22:28
• Updated: 04/Oct/19 14:55

Description

The unit test added in ZOOKEEPER-3109 turns out to be quite flaky.

See https://builds.apache.org/job/zOOkeeper-Find-Flaky-Tests/511/artifact/report.html

Recent failure builds:

https://builds.apache.org/job/ZooKeeper-trunk//181 

https://builds.apache.org/job/ZooKeeper-trunk//179 

https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/2123/testReport/junit/org.apache.zookeeper.server.quorum/QuorumPeerMainTest/testLeaderElectionWithDisloyalVoter_stillHasMajority/ 

 

Snapshot of the failure:

org.apache.zookeeper.server.quorum.QuorumPeerMainTest.testLeaderElectionWithDisloyalVoter_stillHasMajority

Error Message
Server 0 should have joined quorum by now
Stacktrace
junit.framework.AssertionFailedError: Server 0 should have joined quorum by now
	at org.apache.zookeeper.server.quorum.QuorumPeerMainTest.testLeaderElection(QuorumPeerMainTest.java:1482)
	at org.apache.zookeeper.server.quorum.QuorumPeerMainTest.testLeaderElectionWithDisloyalVoter_stillHasMajority(QuorumPeerMainTest.java:1431)
	at org.apache.zookeeper.JUnit4ZKTestRunner$LoggedInvokeMethod.evaluate(JUnit4ZKTestRunner.java:79)

Issue Links

• is caused by: ZOOKEEPER-3109 Avoid long unavailable time due to voter changed mind when activating the leader during election
• is duplicated by: ZOOKEEPER-3214 Flaky test: org.apache.zookeeper.server.quorum.QuorumPeerMainTest.testLeaderElectionWithDisloyalVoter