An activity warning - OnFailure: No data from server

engcoder

hi,
i have a problem in my adapter that it is initialized then make a subscribe to items from another adapter to do some calculations an then push the result to lightstreamer.
sometimes after few minutes a some connection exceptions is appeared from the connection listener as :

public void OnActivityWarning(bool warningOn)
warningOn = true

public void OnFailure(PushServerException e)
e.Message = No data from server

what does these exceptions mean? and what the reasons which make that ?

Giuseppe Corti

Hi engcoder,

Indicates that an attempt to reconnect to a session has not received any answer for longer than a configurable timeout time.

Indeed, it should be further investigated in the server log to find out the reasons for the disconnection and the failure of reconnection.
Please confirm that the adapter and the Lightstreamer server run on different machines so that network issues can not be escluded.

Regards,
Giuseppe

engcoder

hi,
i can not find the reason of disconnect
this is the log file of the day
http://www.mediafire.com/download/fe4qd99xxit15x0/Lightstreamer23-5.log.zip

the disconnection occured between 10:02 AM : 10:03 AM

and how can i manage the timeout period from config.

Giuseppe Corti

Hi engcoder,

I'm not sure I have identified just the Adapter disconnection we are talking about, indeed in the range indicated there are a few sessions that disconnected.
All these disconnections seem to be related to client-side problems, or in any case voluntary closure of the session.
However, I want to point out that starting at 10:00:00 AM for about 3 minutes we have thousands of messages like these:

Unexpected snapshot event for MERGE item trade_info179
Unexpected snapshot event for MERGE item syola108
Unexpected UPDATE event for key 164-p0-3. Event propagated as an ADD command.

Despite all these messages are not fatal, and the server still able to handle the updates, it might be useful to check the Adapter code to properly handle the snapshot flag on each update.

On the other hand, I have a doubt, it is possible that all these updates are also received by your other adapter and the load for calculations processing is so high to cause the disconnection?

That said, the reconnection timeout is configurable by ConnectionInfo.ReconnectionTimeoutMillis property.

Regards,
Giuseppe