public void testLeaderReplicatesSnapshotToOutOfSyncFollowers() throws Exception {
Protocol<Member> protocol = new LocalProtocol();
TestLog log1 = new TestLog();
log1.appendEntry(new ConfigurationEntry(1, new ClusterConfig()
.withLocalMember(new Member("foo"))
.withRemoteMembers(new Member("bar"), new Member("baz"))));
for (long i = 0; i < 1000; i++) {
log1.appendEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")));
}
SnapshotEntry snapshot1 = new SnapshotEntry(1, new ClusterConfig()
.withLocalMember(new Member("foo"))
.withRemoteMembers(new Member("bar"), new Member("baz")),
"Hello world!".getBytes());
log1.compact(800, snapshot1);
TestCluster cluster = new TestCluster();
TestNode node1 = new TestNode()
.withCluster("foo", "bar", "baz")
.withProtocol(protocol)
.withTerm(1)
.withLeader("baz")
.withStateMachine(new TestStateMachine())
.withLog(log1)
.withState(CopycatState.FOLLOWER)
.withCommitIndex(999)
.withLastApplied(999);
cluster.addNode(node1);
TestNode node2 = new TestNode()
.withCluster("bar", "foo", "baz")
.withProtocol(protocol)
.withTerm(1)
.withLeader("baz")
.withStateMachine(new TestStateMachine())
.withLog(new TestLog()
.withEntry(new ConfigurationEntry(1, new ClusterConfig()
.withLocalMember(new Member("bar"))
.withRemoteMembers(new Member("foo"), new Member("baz"))))
.withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
.withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
.withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
.withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
.withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz"))))
.withState(CopycatState.FOLLOWER)
.withCommitIndex(0)
.withLastApplied(0);
cluster.addNode(node2);
TestLog log3 = new TestLog();
log1.appendEntry(new ConfigurationEntry(1, new ClusterConfig()
.withLocalMember(new Member("baz"))
.withRemoteMembers(new Member("bar"), new Member("foo"))));
for (long i = 0; i < 1000; i++) {
log3.appendEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")));
}
SnapshotEntry snapshot3 = new SnapshotEntry(1, new ClusterConfig()
.withLocalMember(new Member("baz"))
.withRemoteMembers(new Member("bar"), new Member("foo")),
"Hello world!".getBytes());
log3.compact(800, snapshot3);
TestNode node3 = new TestNode()
.withCluster("baz", "bar", "foo")