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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-1972) Need additional query stats in admin interface - median, 95th and 99th percentile
Date Tue, 01 Jan 2013 21:56:13 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13541922#comment-13541922
] 

Uwe Schindler commented on SOLR-1972:
-------------------------------------

Hi,
I would prefer the forked metrics package, because it is cleaner and does not use global static
registries or timer threads. It may be possible to remove some classes which are not really
needed (e.g. there is a wrapper around an AtomicInteger that adds no functionality, just wraps
all methods) - we could maybe remove this and use the original class from JDK. This all is
just simple statistics and we need only some classes keeping track of requests, which are
owned by the RequestHandler.

I am not so happy with the metrics dependency at all, because it does too much and uncontrollable.
                
> 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: 4.2, 5.0
>
>         Attachments: elyograg-1972-3.2.patch, elyograg-1972-3.2.patch, elyograg-1972-trunk.patch,
elyograg-1972-trunk.patch, elyograg-closeable.patch, leak-closeable.patch, leak.patch, revert-SOLR-1972.patch,
SOLR-1972-branch3x-url_pattern.patch, SOLR-1972-branch4x.patch, SOLR-1972-branch4x.patch,
SOLR-1972_forked-metrics.patch, SOLR-1972_metrics.patch, SOLR-1972_metrics.patch, SOLR-1972_metrics.patch,
SOLR-1972_metrics.patch, SOLR-1972_metrics.patch, SOLR-1972_metrics.patch, SOLR-1972_metrics.patch,
SOLR-1972_metrics.patch, solr1972-metricsregistry-branch4x-failure.log, SOLR-1972.patch, SOLR-1972.patch,
SOLR-1972.patch, SOLR-1972.patch, SOLR-1972-url_pattern.patch, stacktraces.tar.gz
>
>
> 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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