Cassandra cluster manager and endpoint exception - cassandra

Question

I have 4 dependent working windows service in one solution and using cassandrasharp 3.1.4 and cassandra 2.0.6.
On the first one, I initialize clusterManager with; (This code is just working on the first service, when i try to configure clusterManager in each of the services, these services doesn't start.)
CassandraSharp.Config.XmlConfigurator.Configure();
and this is my app.config;
<configSections>
<section name="CassandraSharp" type="CassandraSharp.SectionHandler, CassandraSharp.Interfaces" />
</configSections>
<CassandraSharp>
<Cluster name="main">
<Endpoints>
<Server>kml-vm-cas-001.cloudapp.net</Server>
</Endpoints>
</Cluster>
</CassandraSharp>
and OnStop of each of services;
ClusterManager.Shutdown();
Process is simple, each of these services read string from different live stream, deserialize and push to cassandra.
string query = null;
ICqlCommand pocoCommand = null;
Task task = null;
using (ICluster iCluster = ClusterManager.GetCluster("main"))
{
query = string.Format("insert into Tvr.Zools (Part, Name, Ticks) values ('zools', '{0}', {1}) using ttl 86400;",
this.zools[i].Name,
dateTime.Ticks,
);
pocoCommand = iCluster.CreatePocoCommand();
task = pocoCommand.Execute(query).AsFuture();
task.Wait();
query = string.Format("insert into Tvr.Temps (Part, Name, Ticks) values ('zools', '{0}', {1}) using ttl 10800;", this.zools[i].Name, dateTime.Ticks);
pocoCommand = iCluster.CreatePocoCommand();
task = pocoCommand.Execute(query).AsFuture();
task.Wait();
}
This works well for small streams but when these services starts to catch huge load of streams i got these exceptions;
System.ArgumentException: Can't find any valid endpoint
and for some of the services;
System.InvalidOperationException: ClusterManager is not initialized
I tried this in each of services but didn't work;
CassandraSharp.Config.XmlConfigurator.Configure();
//push process..
ClusterManager.Shutdown();
Sorry for any missing information, I'll edit if there is any.
Thanks already.

Answer 1

CassandraSharp handles all of the connection management and pooling for you. All you have to do is run CassandraSharp.Config.XmlConfigurator.Configure(); one time per application. CassandraSharp will then open a connection for you as you need it. You should only call ClusterManager.Shutdown(); when the app is shutting down. Here is a snippet from the author of CassandraSharp:
Configure() must be called once and never more. If you want to shut
down all your clusters connections (let say your process is exiting),
then call Shutdown().
Shutdown() is shutting down all your connections and services for the
whole process - it might have bad impact on the rest of your
application if you are connecting to several clusters in the same
process.
Even if you are connecting to multiple clusters you should define them in the XML config and still only call Configure() one time. So here is an example setup.
Example XML Config
<CassandraSharp>
<Cluster name="Dev">
<Transport cl="ONE" cqlver="3.1.1" />
<Endpoints>
<Server>server1.test.com</Server>
</Endpoints>
</Cluster>
<Cluster name="Prod">
<Transport cl="ONE" cqlver="3.1.1" />
<Endpoints>
<Server>server1.test.com</Server>
<Server>server2.test.com</Server>
</Endpoints>
</Cluster>
</CassandraSharp>
Sample Code
Notice the static cluster. That will only exist one time in the application so you wont run into issues creating multiple instances.
public interface IClusterFactory
{
ICluster GetCluster();
}
public class ClusterFactory : IClusterFactory
{
private static ICluster cluster;
public ICluster GetCluster()
{
if (cluster != null)
{
return cluster;
}
else
{
XmlConfigurator.Configure();
cluster = ClusterManager.GetCluster("Prod");
return cluster;
}
}
}
Then whenever you want to get a connection to Cassandra:
IClusterFactory factory = new ClusterFactory();
ICluster cluster = factory.GetCluster();
IPropertyBagCommand cmd = cluster.CreatePropertyBagCommand();
Don't worry about disposing or closing the cluster as that get's handled in CassandraSharp. Just do a ClusterManager.Shutdown() when the application shuts down.