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From Doug Cutting <>
Subject Re: [jira] Commented: (LUCENE-845) If you "flush by RAM usage" then IndexWriter may over-merge
Date Fri, 23 Mar 2007 20:01:25 GMT
Michael McCandless wrote:
> Also, one caveat: whenever #docs (21578 for Reuters) divided by
> maxBuffered docs is less than mergeFactor, you will have no merges
> take place during your runs.  This greatly skews the results.

Also, my guess is that this index fits entirely in the buffer cache. 
Things behave quite differently when segments are larger than available 
memory and merging requires lots of disk i/o.


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