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From "Shawn Heisey (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-1972) Need additional query stats in admin interface - median, 95th and 99th percentile
Date Mon, 22 Oct 2012 05:26:15 GMT

     [ https://issues.apache.org/jira/browse/SOLR-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shawn Heisey updated SOLR-1972:
-------------------------------

    Attachment: SOLR-1972-branch4x.patch

New patch against branch_4x.  The code hasn't changed, just the example solrconfig.xml.  The
config is now commented out and says EXPERIMENTAL.  No performance impact should occur when
the config is not used.

The metrics package Alan mentioned looks like a better long-term solution, but in the meantime,
we have this.

It hasn't received widespread testing, but I've been using a previous version of the patch
in 3.x for a very long time (16384 samples on two handlers) with no trouble.  Our query volume
is low, so we have never noticed any performance impact.  It's provided a lot of valuable
insight into Solr performance.  I think a lot of other people would get value out of this.

                
> Need additional query stats in admin interface - median, 95th and 99th percentile
> ---------------------------------------------------------------------------------
>
>                 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
>         Attachments: elyograg-1972-3.2.patch, elyograg-1972-3.2.patch, elyograg-1972-trunk.patch,
elyograg-1972-trunk.patch, SOLR-1972-branch3x-url_pattern.patch, SOLR-1972-branch4x.patch,
SOLR-1972-branch4x.patch, SOLR-1972.patch, SOLR-1972.patch, SOLR-1972.patch, SOLR-1972.patch,
SOLR-1972-url_pattern.patch
>
>
> 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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