public async Task RunsErrandsForLogs()
{
var leaderId = Guid.NewGuid();
_server = new DefaultRaftServer(_sister, _sister, _sister, _maqina.Object, _manijer.Object, _settings);
_server.Start();
// has to be done - otherwise it becomes a candidate
_server.LastHeartBeat = new AlwaysRecentTimestamp();
_server.LastHeartBeatSent = new AlwaysRecentTimestamp();
var currentPosition = 0;
var term = 2;
for (int i = 0; i < 10; i++)
{
var entries = GetSomeRandomEntries();
await _server.AppendEntriesAsync(new AppendEntriesRequest()
{
CurrentTerm = term,
Entries = entries,
LeaderCommitIndex = currentPosition + entries.Length,
LeaderId = leaderId,
PreviousLogIndex = currentPosition - 1,
PreviousLogTerm = term
});
currentPosition += entries.Length;
}
Assert.Equal(currentPosition - 1, _sister.LastIndex);
Assert.Equal(Role.Follower, _server.Role);
}
public async Task KeepFeedingAFollowerAndNeverDreamsOfPower()
{
var t = new CancellationTokenSource();
var leaderId = Guid.NewGuid();
_server = new DefaultRaftServer(_sister, _sister, _sister, _maqina.Object, _manijer.Object, _settings);
_server.Start();
// to set the term to 1
await _server.AppendEntriesAsync(new AppendEntriesRequest()
{
CurrentTerm = 1,
Entries = new byte[0][],
LeaderCommitIndex = 20,
LeaderId = leaderId,
PreviousLogIndex = -1,
PreviousLogTerm = 0
});
_server.LastHeartBeat = new AlwaysRecentTimestamp();
_server.LastHeartBeatSent = new AlwaysRecentTimestamp();
TheTrace.TraceInformation("OK, now this is before wait...");
Thread.Sleep(1000);
TheTrace.TraceInformation("Wait finished.");
Assert.Equal(1, _server.State.CurrentTerm);
TheTrace.TraceInformation("Checked Term.");
Assert.Equal(Role.Follower, _server.Role);
TheTrace.TraceInformation("Checked Role.");
t.Cancel();
}
public async Task CreatesSnapshotAsAFollower()
{
var leaderId = Guid.NewGuid();
_settings.MinSnapshottingIndexInterval = 10L;
_server = new DefaultRaftServer(_sister, _sister, _sister, _maqina.Object, _manijer.Object, _settings);
_server.LastHeartBeat = new AlwaysRecentTimestamp();
_server.LastHeartBeatSent = new AlwaysRecentTimestamp();
_server.Start();
var term = 1;
var count = 15L;
var entry = new byte[122];
var entries = new [] { entry };
for (int i = 0; i < count; i++)
{
await _server.AppendEntriesAsync(new AppendEntriesRequest()
{
CurrentTerm = term,
Entries = entries,
LeaderCommitIndex = i - 1,
LeaderId = leaderId,
PreviousLogIndex = i - 1,
PreviousLogTerm = term
});
}
Thread.Sleep(1000); // must be a leader by now
Assert.Equal(Role.Follower, _server.Role);
Snapshot ss;
Assert.True(_server.SnapshotOperator.TryGetLastSnapshot(out ss));
Assert.Equal(count - 2, ss.LastIncludedIndex); // last index is 14 and PreviousLogIndex is set to i-1 => 13
Assert.Equal(term, ss.LastIncludedTerm);
Assert.Equal(count - 1, _server.LogPersister.LogOffset);
}