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From "Neil Ireson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-6803) Pivot Performance
Date Thu, 27 Nov 2014 15:31:12 GMT
Neil Ireson created SOLR-6803:
---------------------------------

             Summary: Pivot Performance
                 Key: SOLR-6803
                 URL: https://issues.apache.org/jira/browse/SOLR-6803
             Project: Solr
          Issue Type: Bug
    Affects Versions: 4.10.2
            Reporter: Neil Ireson
            Priority: Minor


I found that my pivot search for terms per day was taking an age so I knocked up a quick test,
using a collection of 1 million documents with a different number of random terms and times,
to compare different ways of getting the counts.

1) Combined = combining the term and time in a single field.
2) Facet = for each term set the query to the term and then get the time facet 
3) Pivot = use the term/time pivot facet.

The following two tables present the results for version 4.9.1 vs 4.10.1, as an average of
five runs.

4.9.1
              |      Processing time in ms     |
Values    |  Combined|     Facet|     Pivot|
100       |        22|        21|        52|
1000      |       178|        57|       115|
10000     |      1363|       211|       310|
100000    |      2592|      1009|       978|
500000    |      3125|      3753|      2476|
1000000   |      3957|      6789|      3725|

4.10.1
              |      Processing time in ms     |
Values    |  Combined|     Facet|     Pivot|
100       |        21|        21|        75|
1000      |       188|        60|       265|
10000     |      1438|       215|      1826|
100000    |      2768|      1073|     16594|
500000    |      3266|      3686|     99682|
1000000   |      4080|      6777|    208873|

The results show that, as the number of pivot values increases (i.e. number of terms * number
of times), pivot performance in 4.10.1 get progressively worse.

I tried to look at the code but there was a lot of changes in pivoting between 4.9 and 4.10,
and so it is not clear to me what has cause the performance issues. However the results seem
to indicate that if the pivot was simply a combined facet search, it could potentially produce
better and more robust performance.



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