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https://issues.apache.org/jira/browse/RATIS-178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16301135#comment-16301135
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Tsz Wo Nicholas Sze commented on RATIS-178:
-------------------------------------------
{code}
@Test
public void testLateServerStart() throws Exception {
final int numServer = 3;
LOG.info("Running testLateServerStart");
final MiniRaftCluster cluster = newCluster(numServer);
cluster.initServers();
// start all except one servers
final Iterator<RaftServerProxy> i = cluster.getServers().iterator();
for(int j = 1; j < numServer; j++) {
i.next().start();
}
final RaftServerImpl leader = waitForLeader(cluster);
TimeUnit.SECONDS.sleep(10);
// start the last server
final RaftServerProxy lastServer = i.next();
lastServer.start();
final RaftPeerId lastServerLeaderId = JavaUtils.attempt(
() -> getLeader(lastServer.getImpl().getState()),
10, 1000, "getLeaderId", LOG);
Assert.assertEquals(leader.getId(), lastServerLeaderId);
}
static RaftPeerId getLeader(ServerState state) {
final RaftPeerId leader = state.getLeaderId();
if (leader == null) {
throw new IllegalStateException("No leader yet");
}
return leader;
}
{code}
The test above can reproduce the bug. The last server s2 may not able to join
the group. s2 keeps starting a leader election but s0 and s1 keep withhold the
vote.
{code}
2017-12-22 16:48:13,621 INFO impl.RaftServerImpl
(RaftServerImpl.java:requestVote(622)) - s0 Withhold vote from server s2 with
term 1. This server: LEADER group-C2DF75108086 s0:t2, leader=s0, voted=s0,
raftlog=[(t:2, i:0)], conf=[s0:0.0.0.0:55968, s1:0.0.0.0:55969,
s2:0.0.0.0:55970], old=null RUNNING, last rpc time from leader s0 is -1
2017-12-22 16:48:13,621 INFO impl.RaftServerImpl
(RaftServerImpl.java:requestVote(622)) - s1 Withhold vote from server s2 with
term 1. This server:FOLLOWER group-C2DF75108086 s1:t2, leader=s0, voted=s0,
raftlog=[(t:2, i:0)], conf=[s0:0.0.0.0:55968, s1:0.0.0.0:55969,
s2:0.0.0.0:55970], old=null RUNNING, last rpc time from leader s0 is 11137ms
{code}
> The third server cannot join the raft group
> -------------------------------------------
>
> Key: RATIS-178
> URL: https://issues.apache.org/jira/browse/RATIS-178
> Project: Ratis
> Issue Type: Bug
> Reporter: Tsz Wo Nicholas Sze
>
> When two servers starts in a 3-server group, they may elect a leader and then
> start the service. Then, start the third server. It somehow fails to join
> the group.
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