Delay in retrieving data

[New Soft]

Dears,

How to update on the Server by setting the LightstreamerLogger.subscriptions and LightstreamerLogger.push loggers at DEBUG level?

This is the log file for the 03-07-2014 which that error occur.

https://www.mediafire.com/?ja8yjv47owkpum8

Regards,

[giuseppe.corti]

Hi NewSoft,

In order to update the log configuration of your Lightstreamer server you should change the loggers definition statements in the "lightstreamer_log_conf.xml" file under the <LS_HOME>/conf folder.
In your case please replace the factory settings for the two loggers with something like this:

<logger name="LightstreamerLogger.subscriptions" level="DEBUG"/><br /> <logger name="LightstreamerLogger.push" level="DEBUG"/>

Log configuration change doesn't need a server restart, but in your case, please restart the server and try to reproduce the issue. If you supply us the log, please indicate the time at which the problem occurs.

In any case in the log file of July 3, we found two particular evidences that might be related to the issue.

First, we can find in the log several messages like this:

03-Jul-14 15:53:10,310|WARN |LightstreamerLogger.scheduler    |Timer-1                    |Current delay for tasks scheduled on thread pool SERVER is 50 seconds

Please note that this would explain the slowness in accepting new connections, reply to subscription and consequently send back the snapshot.

The most common cause for these messages is due to delays in the replies from Remote Metadata/Data Adapters to the server requests. Mainly, the request involved is notifyUser, getItems, getSchema, subscribe and unsubscribe.
From your log it seems that the request the most involved is unsubscribe. Please check if you can find evidence of these delays in the Remote Adapter side.
To address this situation might be helpful to set the SERVER pool with larger dimension, but perhaps before making decisions we should know more.

Second, we can find in the log several messages like this:

Unexpected UPDATE event for key 106-p1-8. Event propagated as an ADD command.

This message states that a UPDATE event is pushed in the server for a key that has never been added for that Item. This may indicate that the Adapter is not perfectly aligned with the status of the subscriptions of the server.

Regards,
Giuseppe