David Smiley created LUCENE-6340:
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Summary: Change spatial RPT default prefixGridScanLevel
Key: LUCENE-6340
URL: https://issues.apache.org/jira/browse/LUCENE-6340
Project: Lucene - Core
Issue Type: Improvement
Components: modules/spatial
Reporter: David Smiley
The "prefixGridScanLevel" tuning knob of RPT was shown to work pretty well
based on benchmarking many years ago against point data. It defaults to 4 up
from the max levels in the tree. However for non-point data, I've seen a
benchmark where it's default setting hurt a ton. Setting it to a large number
like 100 (anything >= maxLevels) effectively disables it. We should pick the
default based on the "pointsOnly" property of RPT -- if you set pointsOnly you
get the current default (scan the bottom 4 levels) otherwise you only scan the
bottom level.
In addition, it's worth reviewing what gains there are for point-only data.
Some testing of FlexPrefixTree last summer of point data showed it didn't seem
to have much affect. But I'd like to investigate more rigorously as that wasn't
primarily what we were looking for.
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