Joel Bernstein created SOLR-6150:
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Summary: Add new AnalyticsQuery to support pluggable analytics.
Key: SOLR-6150
URL: https://issues.apache.org/jira/browse/SOLR-6150
Project: Solr
Issue Type: New Feature
Reporter: Joel Bernstein
Assignee: Joel Bernstein
Priority: Minor
It would be great if there was a clean simple approach to plugin custom
analytics to Solr.
This ticket introduces the AnalyticsQuery class which makes this possible.
To add a custom analytic query you extend AnalyticsQuery and implement:
<code>
public abstract DelegatingCollector getAnalyticsCollector(ResponseBuilder rb,
IndexSearcher searcher);
</code>
This method returns a custom DelegatingCollector which handles the collection
of the analytics.
The DelegatingCollector.finish() method can be used to conveniently finish your
analytics and place the output onto the response.
The AnalyticsQuery also has a nifty constructor that allows you to pass in a
MergeStrategy (see SOLR-5973). So, when you extend AnalyticsQuery you can pass
in a custom MergeStrategy to handle merging of analytic output from the shards
during a distributed search.
This design is a natural extension of the PostFilter framework. So you can
plugin your AnalyticsQuery with a custom QParserPlugin, for example:
{code}
q=*:*&fq={!myanalytic param1=p1}
{code}
Just like PostFilters, AnalyticsQueries can be ordered using the "cost"
parameter. This allows for analytic pipe-lining, where the result of one
AnalyticsQuery can be pipe-lined to another AnalyticsQuery.
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