Moving an index from one Directory to another?

[Avi Drissman]

To improve speed for our application, I'm trying to move our index 
from the disk to a RAM directory when our database is opened, and 
move it back to the disk when the database is closed. The code looks 
something like this:

-----open-----
Directory diskDirectory = FSDirectory.getDirectory(indexPath, false);
if (keepInRAM)
{
        indexDirectory = new RAMDirectory();
        try
        {
                IndexWriter ramWriter = new 
IndexWriter(indexDirectory, analyzer, true);
                ramWriter.addIndexes(new Directory[] 
{diskDirectory}); // load into RAM
                ramWriter.close();
                diskDirectory = FSDirectory.getDirectory(indexPath, 
true); // erase the disk copy
                indexInRAM = true;
        }
        catch (Exception e)
        {
                indexInRAM = false;
                indexDirectory = diskDirectory;
        }
}
else
{
        indexInRAM = false;
        indexDirectory = diskDirectory;
}
-----open-----

-----close-----
if (indexInRAM)
{
        try
        {
                IndexWriter diskWriter = new IndexWriter(indexPath, 
analyzer, true);
                diskWriter.addIndexes(new Directory[] 
{indexDirectory}); // write out to disk
                diskWriter.close();
        }
        catch (Exception e)
        {
                // ...
        }
}
-----close-----

There's only one problem--it's not working.

I have an index on disk. If I search it when it's on the disk, I get 
results. If I try to load it into memory, I don't get any results 
when I search. Similarly, if I add documents to the index while in 
memory and try to write it to disk, I get an empty index (just the 
"segments" file) in the index.

Code almost identical to this has been posted before to the list, and 
I don't see where I'm going wrong here. I'd appreciate any help. (I'm 
using RC4.)

Thanks.

Avi

-- 
Avi Drissman
[EMAIL PROTECTED]
Argh! This darn mailserver is trunca

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