Memory managment and JVM setting for solr

I have a large Data storage(About 500GB pdf and video files) and my machine have a 4GB of RAM capacity, i want to index these file with solrj API's , what is the necessary setting for solrconfig and JVM to ignore heap size problem and other memory crash down during indexing? is it any configuration to force garbage 开发者_JAVA技巧collector to deallocate the memory during indexing?

thanks