[jira] [Created] (SOLR-4763) Performance issue when using group.facet=true

["Alexander Koval (JIRA)" <ji...@apache.org>]

Alexander Koval created SOLR-4763:
-------------------------------------

             Summary: Performance issue when using group.facet=true
                 Key: SOLR-4763
                 URL: https://issues.apache.org/jira/browse/SOLR-4763
             Project: Solr
          Issue Type: Bug
    Affects Versions: 4.2
            Reporter: Alexander Koval


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

I have query that:
{code}
"matches": 730597,
"ngroups": 24024,
{code}

1. All queries with {{group.facet=true}}:
{code}
"QTime": 5171
"facet": {
    "time": 4716
{code}

2. Without {{group.facet}}:
* First query:
{code}
"QTime": 3284
"facet": {
    "time": 3104
{code}

* Next queries:
{code}
"QTime": 230,
"facet": {
    "time": 76
{code}

So I think without {{group.facet}} Solr uses cache to calculate facets.

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

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