Yonik Seeley created SOLR-8096:
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Summary: Major faceting performance regressions
Key: SOLR-8096
URL: https://issues.apache.org/jira/browse/SOLR-8096
Project: Solr
Issue Type: Bug
Affects Versions: 5.3, 5.2, 5.1, 5.0, Trunk
Reporter: Yonik Seeley
Priority: Critical
Use of the highly optimized faceting that Solr had for multi-valued fields over
relatively static indexes was *secretly removed* as part of LUCENE-5666,
causing severe performance regressions.
Here are some quick benchmarks to gauge the damage, on a 5M document index,
with each field having between 0 and 5 values per document. *Higher numbers
represent worse 5x performance*.
Solr 5.4_dev faceting time as a percent of Solr 4.10.3 faceting time
||...................................|| Percent of index being faceted
||num_unique_values|| 10% || 50% || 90% ||
|10 | 351.17% | 1587.08% | 3057.28% |
|100 | 158.10% | 203.61% | 1421.93% |
|1000 | 143.78% | 168.01% | 1325.87% |
|10000 | 137.98% | 175.31% | 1233.97% |
|100000 | 142.98% | 159.42% | 1252.45% |
|1000000 | 255.15% | 165.17% | 1236.75% |
For example, a field with 1000 unique values in the whole index, faceting with
5x took 143% of the 4x time, when ~10% of the docs in the index were faceted.
One user who brought the performance problem to our attention:
http://markmail.org/message/ekmqh4ocbkwxv3we
"faceting is unusable slow since upgrade to 5.3.0" (from 4.10.3)
The disabling of the UnInvertedField algorithm was previously discovered in
SOLR-7190, but we didn't know just how bad the problem was at that time.
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