/// <summary>
/// Waits until that the schema version in all nodes is the same or the waiting time passed.
/// This method blocks the calling thread.
/// </summary>
internal void WaitForSchemaAgreement(Connection connection)
{
if (Hosts.Count == 1)
{
//If there is just one node, the schema is up to date in all nodes :)
return;
}
var start = DateTime.Now;
var waitSeconds = _config.ProtocolOptions.MaxSchemaAgreementWaitSeconds;
Logger.Info("Waiting for schema agreement");
try
{
var totalVersions = 0;
while (DateTime.Now.Subtract(start).TotalSeconds < waitSeconds)
{
var schemaVersionLocalQuery = new QueryRequest(connection.ProtocolVersion, SelectSchemaVersionLocal, false, QueryProtocolOptions.Default);
var schemaVersionPeersQuery = new QueryRequest(connection.ProtocolVersion, SelectSchemaVersionPeers, false, QueryProtocolOptions.Default);
var queries = new [] { connection.Send(schemaVersionLocalQuery), connection.Send(schemaVersionPeersQuery) };
// ReSharper disable once CoVariantArrayConversion
Task.WaitAll(queries, _config.ClientOptions.QueryAbortTimeout);
var versions = new HashSet <Guid>
{
ControlConnection.GetRowSet(queries[0].Result).First().GetValue <Guid>("schema_version")
};
var peerVersions = ControlConnection.GetRowSet(queries[1].Result).Select(r => r.GetValue <Guid>("schema_version"));
foreach (var v in peerVersions)
{
versions.Add(v);
}
totalVersions = versions.Count;
if (versions.Count == 1)
{
return;
}
Thread.Sleep(500);
}
Logger.Info(String.Format("Waited for schema agreement, still {0} schema versions in the cluster.", totalVersions));
}
catch (Exception ex)
{
//Exceptions are not fatal
Logger.Error("There was an exception while trying to retrieve schema versions", ex);
}
}