Re: understanding how solr/lucene handles a select query (to analyze where solr/lucene is taking time )

[Otis Gospodnetic <ot...@yahoo.com>]

Hi,

I don't think there is anything inside Lucene/Solr that will give you granular timing information.  The only thing I can think of is using &debugQuery=true and looking at timing info for different search components.

You're better off using a profiler, though such slow queries tend to be the result of some bad setup (config, JVM...)

 Otis
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----- Original Message ----
> From: bharath venkatesh <bh...@gmail.com>
> To: solr-user@lucene.apache.org
> Sent: Tue, November 10, 2009 10:30:49 AM
> Subject: understanding how solr/lucene handles a select query (to analyze  where solr/lucene is taking time )
> 
> Hi,
>     As mentioned in my previous post
>   ,
> we are experiencing a delay (latency ) for 15 % of the request to solr .
> delay is about 2-4 sec sometimes it even reaches 10 sec (noticed from apache
> tomcat logs where solr is running , so internal  network issue ruled out).
> So to fix the roblem we need to analyze where  solr/lucene is  taking time ,
> for that  we need to understand how solr/lucene handles a select query
> (what are the methods  being used )   . is there any doc or link which
> explains the same in detail ?  . We are planning to change the source code
> to log the time each method takes while solr handles a request so that we
> can analyze where  solr/lucene is  taking time. I am not sure if this is the
> right way (unless if this is the only way  ) . Is there any other way to
> analyze where  solr/lucene is  taking time ?
> 
> so we need to know two  things :
> 1.how solr/lucene handles a select query (link or doc will do ) ?
> 2. any way to  anaylse where solr/lucene is taking time  ?
> 
> Thanks in Advance,
> Bharath