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From Rob Young <>
Subject Re: Usage RAMDirectory
Date Fri, 28 Oct 2005 14:35:55 GMT
How important is it that the search index be absolutely up to date? I 
read from a RAMDirectory based index but the actual index is in a 
FSDirectory. The way I managed it was to have the RAMDirectory 
periodically (two hourly) reloaded. My data doesn't have to be 
completely up to date so this works for me.

Tobias L├╝tticke wrote:

> 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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