Shai Erera wrote:
What do you mean by "does your test do any merging"?
All I do is create IndexWriter w/ the RAM and MBD settings as I've
described
before. Then I just call addDocument. At the end I call optimize()
(it is a
one time created index, after that I need it optimized for search).
I guess Lucene performs segment merging in between, although I think I
noticed that before optimize is called, there were 10 segments (CFS
files)
of size 200MB each, which matches the default merge factor setting
to 10 (if
I'm not mistaken). Does it mean that no segments were merged during
the
indexing process?
It sounds likely that Lucene didn't do any of its own segment merging
before you called optimize. So this is a good example: if your ram
buffer size had been smaller, probably more than 10 segments would be
flushed which would have kicked off a merge. So even though
throughput tails off as you increase RAM buffer size, larger RAM
buffers result in fewer merges taking place, so for a large enough
index it should be worthwhile having a larger RAM buffer size.
Mike
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