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https://issues.apache.org/jira/browse/SOLR-3222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Russell Black closed SOLR-3222.
-------------------------------
Resolution: Incomplete
Turns out this patch doesn't work, since there is no reliable way to turn a
Query object into URL query parameters. I ended up solving the problem with a
cache plugin. Let me know if you're interested in the solution and I can post
code.
> Pull optimal cache warming queries from a warm solr instance
> ------------------------------------------------------------
>
> Key: SOLR-3222
> URL: https://issues.apache.org/jira/browse/SOLR-3222
> 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="http://www.w3.org/2001/XInclude"/>
> </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 response.
> Patch to follow.
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