/// <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 bool WaitForSchemaAgreement(IConnection connection)
{
if (Hosts.Count == 1)
{
//If there is just one node, the schema is up to date in all nodes :)
return(true);
}
var start = DateTime.Now;
var waitSeconds = Configuration.ProtocolOptions.MaxSchemaAgreementWaitSeconds;
Metadata.Logger.Info("Waiting for schema agreement");
try
{
var totalVersions = 0;
while (DateTime.Now.Subtract(start).TotalSeconds < waitSeconds)
{
var serializer = ControlConnection.Serializer.GetCurrentSerializer();
var schemaVersionLocalQuery =
new QueryRequest(
serializer,
Metadata.SelectSchemaVersionLocal,
QueryProtocolOptions.Default,
false,
null);
var schemaVersionPeersQuery =
new QueryRequest(
serializer,
Metadata.SelectSchemaVersionPeers,
QueryProtocolOptions.Default,
false,
null);
var queries = new[] { connection.Send(schemaVersionLocalQuery), connection.Send(schemaVersionPeersQuery) };
// ReSharper disable once CoVariantArrayConversion
Task.WaitAll(queries, Configuration.DefaultRequestOptions.QueryAbortTimeout);
if (Metadata.CheckSchemaVersionResults(
Configuration.MetadataRequestHandler.GetRowSet(queries[0].Result),
Configuration.MetadataRequestHandler.GetRowSet(queries[1].Result)))
{
return(true);
}
Thread.Sleep(500);
}
Metadata.Logger.Info($"Waited for schema agreement, still {totalVersions} schema versions in the cluster.");
}
catch (Exception ex)
{
//Exceptions are not fatal
Metadata.Logger.Error("There was an exception while trying to retrieve schema versions", ex);
}
return(false);
}