.NET DRIVER - Failed to acquire a connection from connection pool for server with URI as this server has already been removed from routing table. Please retry your query again and you should be routed with a different server from the new routing table

Drivers & Stacks .NET
1

Hi All,

We are facing this error consistently when connecting to Neo4j Causal Cluster from .NET Core using the .NET Driver.

Failed to acquire a connection from connection pool for server with URI as this server has already been removed from routing table. Please retry your query again and you should be routed with a different server from the new routing table. You should not see this error persistently

We have added the driver as a singleton and are using the IDriver through dependency injection :

services.AddSingleton(GraphDatabase.Driver(uri, AuthTokens.Basic(user, password), o => o.WithLogger(new Neo4jLogger())));

Could someone please help.

Best Regards,
Kshitiz Arora

1 Like
2

Hi Kshitiz,

This error indicates that a routing table update has occurred, which will be sent by the cluster if there has been a change to it's 'layout'. For example if a server has gone off line or is restarting. Retrying the query should solve the problem as it will establish a connection with a new server in the routing table. Are you using AutoCommit or transaction functions when running the query, e.g. session.RunAsync or session.ReadTransaction/session.BeginTransaction?

3

Hi @AndyHeap-NeoTec ,

Thanks a lot for you reply.

Please find below the session and transaction creation :

session = _driver.AsyncSession(action => action.WithDatabase(dbName)));

//In case of read
await session.ReadTransactionAsync(async transaction =>

//in case of write
await session.WriteTransactionAsync(async transaction =>

4

Hi Kshitiz,

The code usage looks correct. Is the error constant and preventing any transactions from being run, or is it occasionally appearing and then stopping?

Thanks
Andy