public override void Handle(CanInstallSnapshotResponse resp)
{
if (FromOurTopology(resp) == false)
{
_log.Info("Got an append entries response message outside my cluster topology (id: {0}), ignoring", resp.ClusterTopologyId);
return;
}
Task snapshotInstallationTask;
if (resp.Success == false)
{
_log.Debug("Received CanInstallSnapshotResponse(Success=false) from {0}, Term = {1}, Index = {2}, updating and will try again",
resp.From,
resp.Term,
resp.Index);
_matchIndexes[resp.From] = resp.Index;
_nextIndexes[resp.From] = resp.Index + 1;
_lastContact[resp.From] = DateTime.UtcNow;
_snapshotsPendingInstallation.TryRemove(resp.From, out snapshotInstallationTask);
return;
}
if (resp.IsCurrentlyInstalling)
{
_log.Debug("Received CanInstallSnapshotResponse(IsCurrentlyInstalling=false) from {0}, Term = {1}, Index = {2}, will retry when it is done",
resp.From,
resp.Term,
resp.Index);
_snapshotsPendingInstallation.TryRemove(resp.From, out snapshotInstallationTask);
return;
}
_log.Debug("Received CanInstallSnapshotResponse from {0}, starting snapshot streaming task", resp.From);
// problem, we can't just send the log entries, we have to send
// the full snapshot to this destination, this can take a very long
// time for large data sets. Because of that, we are doing that in a
// background thread, and while we are doing that, we aren't going to be
// doing any communication with this peer. Note that while the peer
// is accepting the snapshot, it isn't counting the heartbeat timer, or
// can move to become a candidate.
// During normal operations, we will never be using this, since we leave a buffer
// in place (by default roughly 4K entries) to make sure that small disconnects will
// not cause us to be forced to send a snapshot over the wire.
if (_snapshotsPendingInstallation.ContainsKey(resp.From))
return; // already sending
var nodeConnectionInfo = Engine.CurrentTopology.GetNodeByName(resp.From);
if (nodeConnectionInfo == null)
{
_log.Info("Got CanInstallSnapshotResponse for {0}, but it isn't in our topology, ignoring", resp.From);
return;
}
var task = new Task(() => SendSnapshotToPeer(nodeConnectionInfo));
task.ContinueWith(_ => _snapshotsPendingInstallation.TryRemove(resp.From, out _));
if (_snapshotsPendingInstallation.TryAdd(resp.From, task))
task.Start();
}
public abstract void Reply(CanInstallSnapshotResponse resp);
public override void Reply(CanInstallSnapshotResponse resp)
{
Reply(resp.Success, resp);
}
public virtual void Handle(CanInstallSnapshotResponse resp)
{
//irrelevant here, so doing nothing (used only in LeaderStateBehavior)
}