Is there a way to trace a Solr query?

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sumsionjg_26599 asked Sep 17, '19 sumsionjg_26599 commented Sep 17, '19

Is there a way to trace a Solr query?

I tried turning tracing on and then running a Solr query through CQL, but the trace stopped at the top of Solr and just gave summary stats about the Solr results.

What I want to know is how many joins happened, and how many documents each search term matched. I want to know how expensive each join was (how much it contributed to the latency of the search). I also want to know how many filter cache entries got reused (or had to get recalculated).

Is there a way to do this with DSE query tracing? If not, is there a way to do this with Solr?

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Answer 1 · 2019-09-17T18:47:53Z

maedhroz answered Sep 17, '19 sumsionjg_26599 commented Sep 17, '19

Unfortunately, CQL tracing does not reach into the Solr query execution apparatus. In the case of HTTP queries, Solr itself exposes the debug parameter, but that rolls down to the query phase level, and while it's worth a try, might not be at the granularity you're looking for.

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sumsionjg_26599 · Sep 17, 2019 at 08:08 PM

The debug parameter will help get further than I currently am. Thanks for the pointer.

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