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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-1972) Need additional query stats in admin interface - median, 95th and 99th percentile
Date Fri, 26 Oct 2012 14:15:13 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13484945#comment-13484945
] 

Adrien Grand commented on SOLR-1972:
------------------------------------

Hi Alan,

This is great to have all these statistics available through JMX, this would be really helpful
for Solr monitoring! Instead of relying on {{RequestHandlerBase.toString}} to return a distinct
instance per request handler, maybe each request handler should have its own {{MetricsRegistry}}
(or maybe use the request handler path as the scope, but this looks harder to do)?

I have no objection to adding the metrics jar to the dependencies of solr-core.
                
> 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
>          Components: web gui
>    Affects Versions: 1.4
>            Reporter: Shawn Heisey
>            Assignee: Alan Woodward
>            Priority: Minor
>             Fix For: 4.1
>
>         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_metrics.patch, SOLR-1972_metrics.patch, SOLR-1972_metrics.patch,
SOLR-1972_metrics.patch, SOLR-1972_metrics.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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