// schema
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, HashSet <string> >();
string partitioner = null;
var foundHosts = new List <IPAddress>();
var dcs = new List <string>();
var racks = new List <string>();
var allTokens = new List <HashSet <string> >();
{
int sessionId = _activeConnection.Value.AllocateStreamId();
var rowset = ProcessRowset(
_activeConnection.Value.Query(
sessionId, SelectPeers, false, QueryProtocolOptions.Default, _cluster.Configuration.QueryOptions.GetConsistencyLevel()), SelectPeers);
foreach (Row row in rowset.GetRows())
{
IPAddress hstip = null;
if (!row.IsNull("rpc_address"))
{
hstip = row.GetValue <IPAddress>("rpc_address");
}
if (hstip == null)
{
if (!row.IsNull("peer"))
{
hstip = row.GetValue <IPAddress>("peer");
}
_logger.Error("No rpc_address found for host in peers system table. ");
}
else if (hstip.Equals(Session.BindAllAddress))
{
if (!row.IsNull("peer"))
{
hstip = row.GetValue <IPAddress>("peer");
}
}
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 HashSet <string>());
}
else
{
allTokens.Add(new HashSet <string>(col));
}
}
}
}
{
int streamId = _activeConnection.Value.AllocateStreamId();
Host localhost = _cluster.Metadata.GetHost(_activeConnection.Value.GetHostAdress());
var rowset = ProcessRowset(
_activeConnection.Value.Query(
streamId, SelectLocal, false, QueryProtocolOptions.Default, _cluster.Configuration.QueryOptions.GetConsistencyLevel()), SelectLocal);
// Update cluster name, DC and rack for the one node we are connected to
foreach (Row 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 HashSet <string>());
}
tokenMap[localhost.Address].UnionWith(tokens);
}
}
break; //fetch only one row
}
}
for (int i = 0; i < foundHosts.Count; i++)
{
Host 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].Count != 0)
{
tokenMap.Add(host.Address, allTokens[i]);
}
}
// Removes all those that seems to have been removed (since we lost the control connection)
var foundHostsSet = new HashSet <IPAddress>(foundHosts);
foreach (IPAddress host in _cluster.Metadata.AllReplicas())
{
if (!host.Equals(_activeConnection.Value.GetHostAdress()) && !foundHostsSet.Contains(host))
{
_cluster.Metadata.RemoveHost(host);
}
}
if (partitioner != null)
{
_cluster.Metadata.RebuildTokenMap(partitioner, tokenMap);
}
_logger.Info("NodeList and TokenMap have been successfully refreshed!");
}
// schema
private void RefreshNodeListAndTokenMap()
{
_logger.Info("Refreshing NodeList and TokenMap..");
// Make sure we're up to date on nodes and tokens
var tokenMap = new Dictionary <IPEndPoint, HashSet <string> >();
string partitioner = null;
var foundHosts = new List <IPEndPoint>();
var dcs = new List <string>();
var racks = new List <string>();
var allTokens = new List <HashSet <string> >();
{
var rowset = Query(SelectPeers);
foreach (Row row in rowset.GetRows())
{
IPAddress address = null;
if (!row.IsNull("rpc_address"))
{
address = row.GetValue <IPAddress>("rpc_address");
}
if (address == null)
{
if (!row.IsNull("peer"))
{
address = row.GetValue <IPAddress>("peer");
}
_logger.Error("No rpc_address found for host in peers system table. ");
}
else if (address.Equals(BindAllAddress))
{
if (!row.IsNull("peer"))
{
address = row.GetValue <IPAddress>("peer");
}
}
if (address != null)
{
// Translate discovered node address
var originalAddress = new IPEndPoint(address, ProtocolOptions.DefaultPort);
var translatedAddress = TranslateAddress(originalAddress);
foundHosts.Add(translatedAddress);
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 HashSet <string>());
}
else
{
allTokens.Add(new HashSet <string>(col));
}
}
}
}
{
Host localhost = _cluster.Metadata.GetHost(_activeConnection.Value.Address);
var rowset = Query(SelectLocal);
// Update cluster name, DC and rack for the one node we are connected to
var localRow = rowset.First();
var clusterName = localRow.GetValue <string>("cluster_name");
if (clusterName != null)
{
_cluster.Metadata.ClusterName = clusterName;
}
int protocolVersion;
if (rowset.Columns.Any(c => c.Name == "native_protocol_version") &&
Int32.TryParse(localRow.GetValue <string>("native_protocol_version"), out protocolVersion))
{
//In Cassandra < 2
// there is no native protocol version column, it will get the default value
_protocolVersion = protocolVersion;
}
// 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 HashSet <string>());
}
tokenMap[localhost.Address].UnionWith(tokens);
}
}
}
for (int i = 0; i < foundHosts.Count; i++)
{
Host 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].Count != 0)
{
tokenMap.Add(host.Address, allTokens[i]);
}
}
// Removes all those that seems to have been removed (since we lost the control connection)
var foundHostsSet = new HashSet <IPEndPoint>(foundHosts);
foreach (IPEndPoint host in _cluster.Metadata.AllReplicas())
{
if (!host.Equals(_activeConnection.Value.Address) && !foundHostsSet.Contains(host))
{
_cluster.Metadata.RemoveHost(host);
}
}
if (partitioner != null)
{
_cluster.Metadata.RebuildTokenMap(partitioner, tokenMap);
}
_logger.Info("NodeList and TokenMap have been successfully refreshed!");
}