If you have sparse data, I would have expected index time to *decrease*,
not increase.

Can you enable the IW info stream and share flush + merge times to see
where indexing time goes?

If you can run with a profiler, this might also give useful information.

Le jeu. 18 janv. 2018 à 11:23, Rob Audenaerde <rob.audenae...@gmail.com> a
écrit :

> Hi all,
> We recently upgraded from Lucene 6.6 to 7.1.  We see a significant drop in
> indexing performace.
> We have a-typical use of Lucene, as we (also) index some database tables
> and add all the values as AssociatedFacetFields as well. This allows us to
> create pivot tables on search results really fast.
> These tables have some overlapping columns, but also disjoint ones.
> We anticipated a decrease in index size because of the sparse docvalues. We
> see this happening, with decreases to ~50%-80% of the original index size.
> But we did not expect an drop in indexing performance (client systems
> indexing time increased with +50% to +250%).
> (Our indexing-speed used to be mainly bound by the speed the Taxonomy could
> deliver new ordinals for new values, currently we are investigating if this
> is still the case, will report later when a profiler run has been done)
> Does anyone know if this increase in indexing time is to be expected as
> result of the sparse docvalues change?
> Kind regards,
> Rob Audenaerde

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