Questions on optimizing RptWithGeometrySpatialField

[Benoît Denis <Be...@Spacebel.be>]

Hello,

I am indexing WKT polygons on a RptWithGeometrySpatialField defined as follows:

<fieldType name="location_grpt" class="solr.RptWithGeometrySpatialField"
               spatialContextFactory="JTS" autoIndex="true"
               geo="true" distErrPct="0.5" maxDistErr="1" distanceUnits="kilometers" />

I am currently experimenting on tuning the values of distErrPct and maxDistErr.

From my experiments, increasing the value of distErrPct from the default 0.15 to 0.5 greatly increases indexing speed (5 times faster), however, only increasing maxDistErr from 0.001 to 1 has no impact at all.

I have a few questions:


·        I do not understand clearly from the documentation how do distErrPct and maxDistErr relate to each other and what explains that changing maxDistErr does not have impact. Is it possible to further explain the relationship between those two values?

·        From the documentation, whatever is the value of distErrPct, with RptWithGeometrySpatialField my queries will always be fully precise. Is it correct? So why not always putting the value to 0.5, which seems to improve indexing performance and I am not measuring major query speed impact.

·        Lastly, the documentation says that RptWithGeometrySpatialField is particularly optimized for INTERSECTS. Most of my queries are currently testing the intersections of a box with indexed polygons. The box is transformed to a coordinated range query, such as  myfield:[49.9,57.0 TO 72.8,160.1] . Should I modify my code to do explicitly an INTERSECTS for better performances or is my query automatically converted to an INTERSECTS?

Thank you in advance!

Benoît



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