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https://issues.apache.org/jira/browse/RATIS-495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze reassigned RATIS-495:
-----------------------------------------
Assignee: Tsz Wo Nicholas Sze
r495_20190312.patch: adds some checks.
> Leader Election thread might crash if two servers having the same id
> --------------------------------------------------------------------
>
> Key: RATIS-495
> URL: https://issues.apache.org/jira/browse/RATIS-495
> Project: Ratis
> Issue Type: Bug
> Affects Versions: 0.2.0
> Reporter: Andy Wu
> Assignee: Tsz Wo Nicholas Sze
> Priority: Major
> Attachments: r495_20190312.patch
>
>
> When two servers are (mis)configured with the same id, thread running
> LeaderElection#waitForResults might crash.
> {code:java}
> try {
> if (conf.hasMajority(votedPeers, server.getId())) {
> }
> } catch(ExecutionException e) {}
>
> boolean hasMajority(Collection<RaftPeerId> others, RaftPeerId selfId) {
> Preconditions.assertTrue(!others.contains(selfId));
> return conf.hasMajority(others, selfId) && (oldConf == null ||
> oldConf.hasMajority(others, selfId));
> }
> {code}
> Preconditions.assertTrue(!others.contains(selfId)); statement inside
> RaftConfiguration#hasMajority() might throw IllegalStateException. This
> RunTimeException will kill thread running LeaderElection#waitForResults code.
> stacktrace:
> {code:java}
> Exception in thread "Thread-13" java.lang.IllegalStateException
> at org.apache.ratis.util.Preconditions.assertTrue(Preconditions.java:33)
> at
> org.apache.ratis.server.impl.RaftConfiguration.hasMajority(RaftConfiguration.java:211)
> at
> org.apache.ratis.server.impl.LeaderElection.waitForResults(LeaderElection.java:225)
> at
> org.apache.ratis.server.impl.LeaderElection.askForVotes(LeaderElection.java:146)
> at
> org.apache.ratis.server.impl.LeaderElection.run(LeaderElection.java:102){code}
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