What’s the exact name of the file in question? Do you mean /opt/kaltura/app/cache/batch/config.ini, perhaps? That’s a rather small file… The relatively big log files are all under /opt/kaltura/log (with the batch worker logs residing under /opt/kaltura/log/batch) and there’s logrotate configuration for them.
You can also control the log verbosity by modifying the
.*filters.priority.priority directives in /opt/kaltura/app/configurations/logger.ini (reload Apache after making such changes); naturally, the lower the number, the smaller the log file will be. However, when debugging, you should set the verbosity back to 7 (DEBUG).