gather.max_heap_size (collection.cfg setting)
This option sets the Java heap size in megabytes using the Java command-line options:
-Xmx. This will be used when launching Java based gatherers such as the web crawler, filecopier, custom groovy gather scripts, database gatherer, directory gatherer, etc.
The minimum value is 32.
To change the heap size to 1024MB
The heap size should never exceed the amount of available memory physical memory. When setting the heap size you will need to take into account the amount of memory being used by the OS, Funnelback Web Server (Jetty), Funnelback daemon server, Funnelback redis server as well as other running processes.