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From Hani Suleiman <>
Subject Re: File timestamps
Date Tue, 21 Oct 2003 17:16:50 GMT
Adding it inside of a file (segments or otherwise) would mean that the 
file has to be opened to be read...I might be completely wrong here, but 
wouldn't it be more efficient to have a separate timestamp file, eg 
something called segments.[timestamp], with appropriate magic to ensure 
it's atomically modified etc, and a filter to check for it?

Doug Cutting wrote:

> Christoph Goller wrote:
>> What about living the file timestamps as they are and using
>> an additional file per index that contains nothing but a counter (type 
>> long)
>> which gets incremented everytime the index is changed (SegmentReader and
>> IndexWriter). I could implement this.
> I think this is a good idea and would love to see an implementation.  My 
> guess is that you would do something like add a file called "version" 
> which contains nothing but this long.  Alternately, you could add the 
> version at the end of the "segments" file or something.  Then all of the 
> IndexReader lastModified methods could be changed to return the value of 
> the version rather than a date.  For back-compatibility, the version 
> could in fact be the millisecond time.
> Is that the sort of thing you're thinking of?
> Doug
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