[SOLR-4763] Performance issue when using group.facet=true

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.2
• Fix Version/s: 6.4, 7.0
• Assignee: Erick Erickson
• Reporter: Alexander Koval
• Created: 25/Apr/13 10:38
• Updated: 14/Apr/17 14:03
• Resolved: 30/Dec/16 01:53

Description

I do not know whether this is bug or not. But calculating facets with group.facet=true is too slow.

I have query that:

"matches": 730597,
"ngroups": 24024,

1. All queries with group.facet=true:

"QTime": 5171
"facet": {
    "time": 4716

2. Without group.facet:

• First query:

  "QTime": 3284
  "facet": {
      "time": 3104
  

• Next queries:

  "QTime": 230,
  "facet": {
      "time": 76
  

So I think with group.facet=true Solr doesn't use cache to calculate facets.

Is it possible to improve performance of facets when group.facet=true?

Issue Links

• is related to: SOLR-10246 Support grouped faceting for date field type
• relates to: SOLR-7036 Faster method for group.facet