private void RefreshNodeListAndTokenMap()
{
_logger.Info("Refreshing NodeList and TokenMap..");
// Make sure we're up to date on nodes and tokens
var tokenMap = new Dictionary <IPAddress, DictSet <string> >();
string partitioner = null;
var foundHosts = new List <IPAddress>();
var dcs = new List <string>();
var racks = new List <string>();
var allTokens = new List <DictSet <string> >();
IPAddress queriedHost;
using (var rowset = _session.Query(SelectPeers, ConsistencyLevel.Quorum))
{
queriedHost = rowset.Info.QueriedHost;
foreach (var row in rowset.GetRows())
{
IPAddress hstip = null;
if (!row.IsNull("rpc_address"))
{
hstip = row.GetValue <IPEndPoint>("rpc_address").Address;
}
if (hstip == null)
{
if (!row.IsNull("peer"))
{
hstip = row.GetValue <IPEndPoint>("peer").Address;
}
_logger.Error("No rpc_address found for host in peers system table. ");
}
else if (hstip.Equals(bindAllAddress))
{
if (!row.IsNull("peer"))
{
hstip = row.GetValue <IPEndPoint>("peer").Address;
}
}
if (hstip != null)
{
foundHosts.Add(hstip);
dcs.Add(row.GetValue <string>("data_center"));
racks.Add(row.GetValue <string>("rack"));
var col = row.GetValue <IEnumerable <string> >("tokens");
if (col == null)
{
allTokens.Add(new DictSet <string>());
}
else
{
allTokens.Add(new DictSet <string>(col));
}
}
}
}
var localhost = _cluster.Metadata.GetHost(queriedHost);
var iterLiof = new List <Host>()
{
localhost
}.GetEnumerator();
iterLiof.MoveNext();
List <IPAddress> tr = new List <IPAddress>();
Dictionary <IPAddress, List <Exception> > exx = new Dictionary <IPAddress, List <Exception> >();
int streamId;
var cn = _session.Connect(null, iterLiof, tr, exx, out streamId);
using (var outp = cn.Query(streamId, SelectLocal, ConsistencyLevel.Default, false))
{
if (outp is OutputRows)
{
var rowset = new RowSet((outp as OutputRows), null, false);
// Update cluster name, DC and rack for the one node we are connected to
foreach (var localRow in rowset.GetRows())
{
var clusterName = localRow.GetValue <string>("cluster_name");
if (clusterName != null)
{
_cluster.Metadata.ClusterName = clusterName;
}
// In theory host can't be null. However there is no point in risking a NPE in case we
// have a race between a node removal and this.
if (localhost != null)
{
localhost.SetLocationInfo(localRow.GetValue <string>("data_center"), localRow.GetValue <string>("rack"));
partitioner = localRow.GetValue <string>("partitioner");
var tokens = localRow.GetValue <IList <string> >("tokens");
if (partitioner != null && tokens.Count > 0)
{
if (!tokenMap.ContainsKey(localhost.Address))
{
tokenMap.Add(localhost.Address, new DictSet <string>());
}
tokenMap[localhost.Address].AddRange(tokens);
}
}
break; //fetch only one row
}
}
}
for (int i = 0; i < foundHosts.Count; i++)
{
var host = _cluster.Metadata.GetHost(foundHosts[i]);
if (host == null)
{
// We don't know that node, add it.
host = _cluster.Metadata.AddHost(foundHosts[i]);
}
host.SetLocationInfo(dcs[i], racks[i]);
if (partitioner != null && !allTokens[i].IsEmpty)
{
tokenMap.Add(host.Address, allTokens[i]);
}
}
// Removes all those that seems to have been removed (since we lost the control connection)
var foundHostsSet = new DictSet <IPAddress>(foundHosts);
foreach (var host in _cluster.Metadata.AllReplicas())
{
if (!host.Equals(queriedHost) && !foundHostsSet.Contains(host))
{
_cluster.Metadata.RemoveHost(host);
}
}
if (partitioner != null)
{
_cluster.Metadata.RebuildTokenMap(partitioner, tokenMap);
}
_logger.Info("NodeList and TokenMap have been successfully refreshed!");
}