EMA TRCC disconnect handling

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Question by EvgeniyK · Mar 04, 2019 at 05:02 AM · ema c++trcc disconnect

EMA TRCC disconnect handling

Hi,

I'm trying to understand how to handle disconnect/reconnect events in TRCC application. I have the following sequence of events and reaction of my application on them:

1. StatusMsg with state="Open / Suspect / None / 'channel down'" received on Login stream

2. StatusMsg with state="Open / Suspect / None / 'Channel is down.'" received on Login stream

3. StatusMsg with state="Closed, Recoverable / Suspect / None / 'Service for this item was lost.'" received on Tunnel stream

3. Application stops posting data

4. StatusMsg with state="Open / Ok / None / 'channel up'" received on Login stream

5. RefreshMsg with state="Open / Ok received on Login stream

5. Application sends and registers new Tunnel stream request

6. StatusMsg with state="Closed, Recoverable / Suspect / None / 'No matching service present.'" received on new Tunnel stream

7. Application is not connected and cannot post anything

So technically reconnection is successful on Login stream and API doesn't try to reconnect again. But tunnel stream is in "Closed, Recoverable" state and I cannot create new tunnel substream for data posting. What am I missing here? Should I unregister Tunnel stream and Tunnel substream upon receiving Open / Suspect on Login stream (although both these streams are closed as per EMA log...)?

Added EMA log: emalog.txt

emalog.txt (33.9 KiB)

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Answer 1 · 2019-03-06T16:37:12Z

Answer by EvgeniyK · Mar 06, 2019 at 04:37 PM

Any thoughts on this? Maybe I received "Closed, Recoverable / Suspect" state on newly requested Tunnel stream because requested service was not up? Then what is recommended way to handle such case? I'm asking because it is not possible to reproduce this case on my side (it happened only once during 3 weeks of testing).

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Answer 2 · 2019-03-07T06:07:59Z

Answer by EvgeniyK · Mar 07, 2019 at 06:07 AM

Ok, this is not some kind of special case. I tried to drop TCP connection with iptables and got exactly the same sequence of events:

1. Connection is down

2. Successful reconnect on Login stream with Refresh message

3. New Tunnel stream requested

4. "Closed, Recoverable / Suspect / None / 'No matching service present.'" state on newly created tunnel stream

I can restore connection only with full application restart, is it expected behavior?

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Answer 3 · 2019-03-08T09:43:31Z

REFINITIV

Answer by Gurpreet. · Mar 08, 2019 at 09:43 AM

Hi @evgeniyk, I have asked the TRCC development to look into the issue and provide a resolution. I will let you know their findings.

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EMA TRCC disconnect handling

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