Nate Denning encountered the following error when trying to load a large (greater than 2147483647 bytes) index into a RAMDirectory. The server has 12GB of memory, so loading it into memory should not be a problem.
Have you instead tried copying the index to a ramfs ('mount -t ramfs'), then opening it with a normal FSDirectory? This forces the entire index into RAM without forcing it into Java's heap. In my experience, huge Java heaps are problematic.
Doug
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