private (bool HasRemovedFromTopology, long LastAcknowledgedIndex, long LastTruncate, long LastCommit) ApplyLeaderStateToLocalState(Stopwatch sp, ClusterOperationContext context, List <RachisEntry> entries, AppendEntries appendEntries)
{
long lastTruncate;
long lastCommit;
bool removedFromTopology = false;
// we start the tx after we finished reading from the network
if (_engine.Log.IsInfoEnabled)
{
_engine.Log.Info($"{ToString()}: Ready to start tx in {sp.Elapsed}");
}
using (var tx = context.OpenWriteTransaction())
{
_engine.ValidateTerm(_term);
if (_engine.Log.IsInfoEnabled)
{
_engine.Log.Info($"{ToString()}: Tx running in {sp.Elapsed}");
}
if (entries.Count > 0)
{
var(lastTopology, lastTopologyIndex) = _engine.AppendToLog(context, entries);
using (lastTopology)
{
if (lastTopology != null)
{
if (_engine.Log.IsInfoEnabled)
{
_engine.Log.Info($"Topology changed to {lastTopology}");
}
var topology = JsonDeserializationRachis <ClusterTopology> .Deserialize(lastTopology);
if (topology.Members.ContainsKey(_engine.Tag) ||
topology.Promotables.ContainsKey(_engine.Tag) ||
topology.Watchers.ContainsKey(_engine.Tag))
{
RachisConsensus.SetTopology(_engine, context, topology);
}
else
{
removedFromTopology = true;
_engine.ClearAppendedEntriesAfter(context, lastTopologyIndex);
}
}
}
}
var lastEntryIndexToCommit = Math.Min(
_engine.GetLastEntryIndex(context),
appendEntries.LeaderCommit);
var lastAppliedIndex = _engine.GetLastCommitIndex(context);
var lastAppliedTerm = _engine.GetTermFor(context, lastEntryIndexToCommit);
// we start to commit only after we have any log with a term of the current leader
if (lastEntryIndexToCommit > lastAppliedIndex && lastAppliedTerm == appendEntries.Term)
{
lastAppliedIndex = _engine.Apply(context, lastEntryIndexToCommit, null, sp);
}
lastTruncate = Math.Min(appendEntries.TruncateLogBefore, lastAppliedIndex);
_engine.TruncateLogBefore(context, lastTruncate);
lastCommit = lastAppliedIndex;
if (_engine.Log.IsInfoEnabled)
{
_engine.Log.Info($"{ToString()}: Ready to commit in {sp.Elapsed}");
}
tx.Commit();
}
if (_engine.Log.IsInfoEnabled)
{
_engine.Log.Info($"{ToString()}: Processing entries request with {entries.Count} entries took {sp.Elapsed}");
}
var lastAcknowledgedIndex = entries.Count == 0 ? appendEntries.PrevLogIndex : entries[entries.Count - 1].Index;
return(HasRemovedFromTopology : removedFromTopology, LastAcknowledgedIndex : lastAcknowledgedIndex, LastTruncate : lastTruncate, LastCommit : lastCommit);
}
