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https://issues.apache.org/jira/browse/SOLR-8096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14948700#comment-14948700
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Uwe Reh commented on SOLR-8096:
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Uwe Schindler wrote:
"Please keep in mind that it took about half a year until the first one
recognized a problem like this, which makes me think that only few people are
using those mostly-static indexes."
I reported the issue in the list and I disagree this view at both points.
1) I noticed the the Problem months ago, but I thought, that it was a problem
of my poorly configured SolrCloud. I had to postpone the project.
2) Nearly all productive installations I know, are still running on Solr 4.x
some even with Solr 3.6. The applications have been designed years ago. For all
of them, there was no need to change a boring but well running production
environment.
Yes, the new features for faceting have been announced, but I had no time to
follow. Since there was no warning in the release notes, I thought it's a good
idea to upgrade first.
Sorry for being a bit off topic
Uwe
> Major faceting performance regressions
> --------------------------------------
>
> Key: SOLR-8096
> URL: https://issues.apache.org/jira/browse/SOLR-8096
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.0, 5.1, 5.2, 5.3, Trunk
> Reporter: Yonik Seeley
> Priority: Critical
>
> Use of the highly optimized faceting that Solr had for multi-valued fields
> over relatively static indexes was 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.
> edit: removed "secret" adverb by request
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