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nicolas.roux avatar image
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NIP publishing on 2 ADH without multicast

I'm working on a NIP which needs to publishes on my TREP infrastructure. Here's my need:

  • One NIP
  • Two ADH
  • I can't use multicast on the server which hosts the NIP
  • I need a fault tolerant solution on the TREP side

Here's what I'm doing currently:

And here’s my test scenario:

  1. I start the ADH pair:
    hot standby : ADH1 active / ADH2 standby
    cache resiliency : True
    cache percistency : True
  2. I start the NIP
  3. When the NIP starts, it connects to the first server of its list: ADH1
  4. My NIP publishes a couple of updates on InstrumentA
  5. I shutdown the NIP
  6. I kill ADH1
  7. If I dump the cache of ADH2, there’s no trace of InstrumentA <= this is a problem

Another scenario:

  1. I start the ADH pair (same configuration)
  2. I start the NIP
  3. When the NIP starts, it connects to ADH1
  4. My NIP publishes a couple of updates on InstrumentA
  5. I kill the ADH1. (ADH2 is now active)
  6. The NIP connects to ADH2
  7. I restart the ADH1. (ADH2 is still active, so ADH1 is standby)
  8. I kill the NIP
  9. I start the NIP

The NIP connects to the first server of its list: ADH1 (which is standby) <= this is another problem…

Am I doing something wrong?
Is there something I should do on my NIP in order to post simultaneously (via RSSL, because I can't use multicat) on both ADH?

elektronrefinitiv-realtimetrepADHnon-interactive-provider
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nicolas.roux avatar image nicolas.roux

(sorry, I posted my question in the "answer"... I'm still new with the forum and I don't see how to edit my question)

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warat.boonyanit avatar image
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Hi @nicolas.roux

I am not sure which TREP API you are using but I assume it is RFA.

If you want RFA to connect to both ADH, you have to use connectionList.

\Sessions\SessionOMMNIProv\connectionList = "Connection_RSSL_NIPROV,Connection_RSSL_NIPROV2"


\Connections\Connection_RSSL_NIPROV\connectionType		= "RSSL_NIPROV"
\Connections\Connection_RSSL_NIPROV\rsslPort 			= "14003"
\Connections\Connection_RSSL_NIPROV\hostName			= "192.168.27.30"

\Connections\Connection_RSSL_NIPROV2\connectionType		= "RSSL_NIPROV"
\Connections\Connection_RSSL_NIPROV2\rsslPort 			= "14003"
\Connections\Connection_RSSL_NIPROV2\hostName			= "192.168.27.60"

With this configuration, RFA should connect and publish to both ADHs.

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nicolas.roux avatar image nicolas.roux

Thanks a lot Warat, it's working perfectly fine!

I just had to modify the Reuters example (ommprovnimdi /

LoginClient.java) in order to always call processLogin(true) as it's explained in the code comments:

// If there is more than one Connection, then this could would 
// need to be changed to always call processLogin(true) when the
// re is a refresh.  In general, if applications wish to use two
// Connections, it is recommended that they use two Sessions.
// (...)

  // if (!_loggedIn)
  //{
                   
  _loggedIn = true;
  _mainApp.processLogin(true);
  //}
  }

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