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From "Russell Black (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-3222) Pull optimal cache warming queries from a warm solr instance
Date Fri, 09 Mar 2012 16:30:57 GMT


Russell Black commented on SOLR-3222:

It is possible to configure how many entries to return from each of the caches.  The default
is 100 from each of the three caches.  To change this, you can pass any of the following parameters
to the request handler:


These parameters could also be specified as defaults in solrconfig.xml:
<requestHandler name="/autowarm" class="solr.AutoWarmRequestHandler" />
  <lst name="defaults">
    <str name="filterCache">50</str> 
    <str name="fieldValueCache">150</str>
    <str name="queryResultCache">200</str>
> Pull optimal cache warming queries from a warm solr instance
> ------------------------------------------------------------
>                 Key: SOLR-3222
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 3.5, 4.0
>            Reporter: Russell Black
>              Labels: patch, performance
>         Attachments: SOLR-3222-autowarm.patch
> Ever wondered what queries to use to prime your cache?  This patch allows you to query
a warm running instance for a list of warming queries.  The list is generated from the server's
caches, meaning you get back an optimal set of queries.  The set is  optimal to the extent
that the caches are optimized.  The queries are returned in a format that can be consumed
by the {code:xml}<listener event="firstSearcher" class="solr.QuerySenderListener">{code}
section of {{solrconfig.xml}}.  
> One can use this feature to generate a static set of good warming queries to place in
{{solrconfig.xml}} under {code:xml}<listener event="firstSearcher" class="solr.QuerySenderListener">{code}
> It can even be used in a dynamic fashion like this:
> {code:xml}
> <listener event="firstSearcher" class="solr.QuerySenderListener">
>   <xi:include href="http://host/solr/core/autowarm" xpointer="element(/1/2)" xmlns:xi=""/>
> </listener>
> {code}
> which can work well in certain distributed load-balanced architectures, although in production
it would be wise to add an {{<xi:fallback>}} element to the include in the event that
the host is down.
> I implemented this by introducing a new request handler:
> {code:xml}
>   <requestHandler name="/autowarm" class="solr.AutoWarmRequestHandler" />
> {code}
> The request handler pulls a configurable number of "top" keys from the {{filterCache}},{{fieldValueCache}},
and {{queryResultCache}}.  For each key, it constructs a query that will cause that key to
be placed in the associated cache.  The list of constructed queries are then returned in the
> Patch to follow.  

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