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From Erik Hatcher <>
Subject Re: [jira] Updated: (LUCENE-843) improve how IndexWriter uses RAM to buffer added documents
Date Fri, 23 Mar 2007 14:25:14 GMT

On Mar 22, 2007, at 8:13 PM, Marvin Humphrey wrote:
> On Mar 22, 2007, at 3:18 PM, Michael McCandless wrote:
>> Actually is #2 a hard requirement?
> A lot of Lucene users depend on having document number correspond  
> to age, I think.  ISTR Hatcher at least recommending techniques  
> that require it.

I may have recommended it only as "if you can guarantee you index in  
age order then you can ... ", but given FunctionQuery's ability to  
rank based on age given a date field per document its not needed.   
Guaranteeing any kind of order of document insertion (given updates  
that delete and re-add) is not really possible in most cases anyway.


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