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From "Shawn Heisey (JIRA)" <j...@apache.org>
Subject [jira] Created: (SOLR-1972) Need additional query stats in admin interface - median, 95th and 99th percentile
Date Thu, 24 Jun 2010 19:53:49 GMT
Need additional query stats in admin interface - median, 95th and 99th percentile
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                 Key: SOLR-1972
                 URL: https://issues.apache.org/jira/browse/SOLR-1972
             Project: Solr
          Issue Type: Improvement
    Affects Versions: 1.4
            Reporter: Shawn Heisey
            Priority: Minor
             Fix For: 3.1


I would like to see more detailed query statistics from the admin GUI.  This is what you can
get now:

requests : 809
errors : 0
timeouts : 0
totalTime : 70053
avgTimePerRequest : 86.59209
avgRequestsPerSecond : 0.8148785 

I'd like to see more data on the time per request - median, 95th percentile, 99th percentile,
and any other statistical function that makes sense to include.  In my environment, the first
bunch of queries after startup tend to take several seconds each.  I find that the average
value tends to be useless until it has several thousand queries under its belt and the caches
are thoroughly warmed.  The statistical functions I have mentioned would quickly eliminate
the influence of those initial slow queries.

The system will have to store individual data about each query.  I don't know if this is something
Solr does already.  It would be nice to have a configurable count of how many of the most
recent data points are kept, to control the amount of memory the feature uses.  The default
value could be something like 1024 or 4096.


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