private IStatement AdaptRpcMasterResult(Task <RowSet> task, TargettedSimpleStatement statement)
{
if (task.IsFaulted)
{
Logger.Verbose("Error querying graph analytics server, query will not be routed optimally: {0}", task.Exception);
return(statement);
}
var row = task.Result.FirstOrDefault();
if (row == null)
{
Logger.Verbose("Empty response querying graph analytics server, query will not be routed optimally");
return(statement);
}
var resultField = row.GetValue <IDictionary <string, string> >("result");
if (resultField == null || !resultField.ContainsKey("location") || resultField["location"] == null)
{
Logger.Verbose("Could not extract graph analytics server location from RPC, query will not be routed optimally");
return(statement);
}
var location = resultField["location"];
var hostName = location.Substring(0, location.LastIndexOf(':'));
var address = _config.AddressTranslator.Translate(
new IPEndPoint(IPAddress.Parse(hostName), _config.CassandraConfiguration.ProtocolOptions.Port));
var host = _coreSession.Cluster.GetHost(address);
statement.PreferredHost = host;
return(statement);
}
private IEnumerable <Host> YieldPreferred(string keyspace, TargettedSimpleStatement statement)
{
yield return(statement.PreferredHost);
foreach (var h in _childPolicy.NewQueryPlan(keyspace, statement))
{
yield return(h);
}
}
private IStatement AdaptRpcMasterResult(Task<RowSet> task, TargettedSimpleStatement statement)
{
if (task.IsFaulted)
{
Logger.Verbose("Error querying graph analytics server, query will not be routed optimally: {0}", task.Exception);
return statement;
}
var row = task.Result.FirstOrDefault();
if (row == null)
{
Logger.Verbose("Empty response querying graph analytics server, query will not be routed optimally");
return statement;
}
var resultField = row.GetValue<IDictionary<string, string>>("result");
if (resultField == null || !resultField.ContainsKey("location") || resultField["location"] == null)
{
Logger.Verbose("Could not extract graph analytics server location from RPC, query will not be routed optimally");
return statement;
}
var location = resultField["location"];
var hostName = location.Substring(0, location.LastIndexOf(':'));
var address = _config.AddressTranslator.Translate(
new IPEndPoint(IPAddress.Parse(hostName),_config.CassandraConfiguration.ProtocolOptions.Port));
var host = _coreSession.Cluster.GetHost(address);
statement.PreferredHost = host;
return statement;
}
