Problem Summary: What are ".cache" files in the router directory?
The cache files are the dumps of the contents of the Hvr catalogs, created by Hvr Load so that capture and integrate jobs can inspect actions without having to make an expensive connection to the hvr hub database which are located under directory structure $HVR_CONFIG/router/<hubname>/<channel name>/catalog.
These can be inspected using command
$ hvrrouterview hub chn 53ba7f7e_6a5a4.cache > cache.xml
Sometimes there are multiple of these files because Hvr Load does not want to delete an old file and create a new one because it's worried that a running job may be reading that file. Instead, it creates a new file with a bigger timestamp in its basename ("53db3914" means "Aug 1 2014" in hex), leaves the file that was 'current' and deletes other cache files.
At the start of each cycle, the running jobs should check if a new cache file has been created and then reload it.