Set connection timeout on cassandra nodes

[MCs88]

Hi!

Is there any way to set connection timeout for the cassandra nodes? I want to decrease the timeout to switch faster to a next node if connection fails to a node.

[pchalamet]

Hi !

You can set a timeout for the socket (see TransportConfig.ReceiveTimeout). But I’m pretty sure that’s not what you really want because that also implies all socket receive operations undergo the same constraints (and it’s pretty lame to do that at transport level).

Probably there is 2 ways to support this:

• Warm up you connections before you start
• Change LongRunningConnection to pass a CancellationToken for each AsFuture() usage (ReadifyConnection and Authenticate) + add a new readifyTimeout in TransportConfig (and don’t forget to send a pull request :) !). If you want some inspiration, look at TimeOutSample showing how to setup a timeout in C*#.

Let me know if you want some help in case you go for #2!

• Pierre Chalamet

[MCs88]

Definitely the 2nd one is the better solution. I'll look the code, thanks!

[MCs88]

I've dived into the code. The problem is that in the constructor of LongRunningConnection class, _tcpClient.Connect() is called. The Connect() method throws an exception because cassandra node is not available, so ReadifiyConnection and Authenticate not even called.

Unfortunately the TcpClient class did not expose any field or property to set connection timeout, so there's no elegant way to solve this, only timers...

[pchalamet]

Yeah but that's really different story.

If you can't connect, this should fail quite immediately and connection will fail and a retry on other endpoint will take place.

My guess is you only want to timeout when then server is overloaded and failed to reply quickly - Readify is the right place for that.

• Pierre

-----Original Message----- From: "MCs88" notifications@github.com Sent: ‎16/‎07/‎2013 17:24 To: "pchalamet/cassandra-sharp" cassandra-sharp@noreply.github.com Cc: "Pierre Chalamet" pierre@chalamet.net Subject: Re: [cassandra-sharp] Set connection timeout on cassandra nodes (#64)

I've dived into the code. The problem is that in the constructor of LongRunningConnection class, _tcpClient.Connect() is called. The Connect() method throws an exception because cassandra node is not available, so ReadifiyConnection and Authenticate not even called. Unfortunately the TcpClient class did not expose any field or property to set connection timeout, so there's no elegant way to solve this, only timers... — Reply to this email directly or view it on GitHub.

[MCs88]

Sometimes we have network connectivity issues, and "quite immediately" is ~20sec per node actually in my tests. We have 3 nodes in a datacenter, so it's 60+ sec to switch to another datacenter, which is out of the http request execution time.

[pchalamet]

Probably something like that then: http://stackoverflow.com/questions/1062035/how-to-config-socket-connect-timeout-in-c-sharp

[pchalamet]

But this should probably be mixed with a cancellation token to span timeout on connect and readify.

[MCs88]

Thanks, I'll take a look at it!

[pchalamet]

You seem to have done a fix in your fork. Are you ok with it ? Do you want to send a pull request ? Thanks.

[MCs88]

Sorry for this big delay. Next week I'll review my changes and I'll send the pull request.