Hi,

for the last days I had the thought lingering in my mind that somehow I had to use the 
RAMDirectory. I have a production system with plenty of memory so that would be nice. 
However, it's a update-happy application and the index needs to be persistent (meaning 
FSDirectory).

Therefore I came up with the idea to use both - RAM and FSDirectory. I plan to read the 
index into RAMDirectory for search purposes and in case of write access just update the 
RAMDirectory as well as the FSDirectory.
Then I have both, persistent storage and fast read access. The double update should be 
bearable since the in-memory update is fast. Moreover, the users are willing to accept a 
delay when writing rather upon reading.

Has anybody ever tried this? Are there downsides or do I miss anything? I imagine I could 
hardly be the first to try this...

I would be happy if someone has experiences to share.

Cheers
   Tobias


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