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From Erick Erickson <erickerick...@gmail.com>
Subject Re: solr 5.2.0 need to build high query response
Date Wed, 06 Jan 2016 17:45:00 GMT
Right, the point of the newSearcher and firstSearcher events
is to smooth out spikes in response time, and it looks like
that's happening now.

>From here, you're in to query tuning. Without knowing your queries,
your schema, how many docs on a server, memory allocation
 and all that it's impossible to say much.

Here are some places to start looking:
https://wiki.apache.org/solr/SolrPerformanceProblems

Start with adding &debug=timing to see where Solr thinks it's
spending time, you'll see breakdowns for how much time
is spent searching, highlighting, faceting, whatever. Likely the
time is in search, but you never know.

Best,
Erick

On Wed, Jan 6, 2016 at 2:15 AM, Novin Novin <toe.alean@gmail.com> wrote:
> Thanks Erick, this listener doing quite a good job. But not what  I needed.
> Do the solr has any other things that I can look into to make it faster.
> FYI  speed goes to 1 sec to 1.2 sec. I actually needed around 500 ms.
>
> On Tue, 5 Jan 2016 at 18:24 Erick Erickson <erickerickson@gmail.com> wrote:
>
>> Yep. Do note what's happening here. You're executing a query
>> that potentially takes 10 seconds to execute (based on your
>> earlier post). But you may be opening a new searcher every
>> 2 seconds. You may start to see "too many on deck searchers"
>> in your log. If you do do _not_ try to "fix" this by upping the
>> maxWarmingSearchers in solrconfig.xml, that's really an
>> anti-pattern.
>>
>> Really, I'd consider relaxing this 2 second limit. I've often found
>> it easier to tell users "it may take up to 30 seconds for newly-added
>> docs to appear in search results" than try to satisfy overly-tight
>> requirements.
>>
>> As a former co-worker often said, "Users are much more comfortable
>> with predictable delays than unpredictable ones". It's surprising how
>> often it's the case.
>>
>> Best,
>> Erick
>>
>> P.S. What's the difference between newSearcher and firstSearcher?
>> newSearcher is fired every time a commit (soft or hard with
>> openSearcher=true)
>> where firstSearcher is fired up only when Solr starts. This is to
>> accommodate
>> the fact that the autowarm counts on things like filterCacher aren't
>> available when Solr starts. In practice, though, many (most?) people
>> put the same query in both.
>>
>> On Tue, Jan 5, 2016 at 9:17 AM, Novin Novin <toe.alean@gmail.com> wrote:
>> > If I'm correct, you are talking about this
>> >
>> > <listener event="newSearcher" class="solr.QuerySenderListener">
>> >             <arr name="queries">
>> >                 <!--
>> >
>> > *And how I can mention my spatial search field here.*
>> >
>> >                    <lst><str name="q">solr</str><str name="sort">price
>> > asc</str></lst>
>> >                    <lst><str name="q">rocks</str><str name="sort">weight
>> > asc</str></lst>
>> >                   -->
>> >             </arr>
>> >         </listener>
>> >         <listener event="firstSearcher" class="solr.QuerySenderListener">
>> >             <arr name="queries">
>> >                 <lst>
>> >
>> > *or may be here too.*
>> >
>> >                     <str name="q">static firstSearcher warming in
>> > solrconfig.xml</str>
>> >                 </lst>
>> >             </arr>
>> >         </listener>
>> >
>> > Thanks,
>> > Novin
>> >
>> > On Tue, 5 Jan 2016 at 16:22 Erick Erickson <erickerickson@gmail.com>
>> wrote:
>> >
>> >> It sounds like you're not doing proper autowarming,
>> >> which you'd need to do either with hard or
>> >> soft commits that open new searchers.
>> >>
>> >> see:
>> >> https://wiki.apache.org/solr/SolrCaching#Cache_Warming_and_Autowarming
>> >>
>> >> In particular, you should have a newSearcher event
>> >> that facets on the fields you expect to need.
>> >>
>> >> Best,
>> >> Erick
>> >>
>> >> On Tue, Jan 5, 2016 at 8:17 AM, Novin Novin <toe.alean@gmail.com>
>> wrote:
>> >> > Thanks David. It is quite good to use for NRT.
>> >> >
>> >> > Apologies, I didn't mention that facet search is really slow.
>> >> >
>> >> > I found the below reason which could be the reason because I am using
>> >> facet
>> >> > spatial search which is getting slow.
>> >> >
>> >> > To know more about solr hard and soft commits, have a look at this
>> blog :
>> >> >
>> >>
>> https://lucidworks.com/blog/2013/08/23/understanding-transaction-logs-softcommit-and-commit-in-sorlcloud/
>> >> >
>> >> > In this article, "soft commits are that they will make documents
>> visible,
>> >> > but at some cost. In particular the “top level” caches, which include
>> >> what
>> >> > you configure in solrconfig.xml (filterCache, queryResultCache, etc)
>> will
>> >> > be invalidated! Autowarming will be performed on your top level caches
>> >> > (e.g. filterCache, queryResultCache), and any newSearcher queries
>> will be
>> >> > executed. Also, the FieldValueCache is invalidated, so facet queries
>> will
>> >> > have to wait until the cache is refreshed."
>> >> >
>> >> > Do you have any idea what could possible be do about this?
>> >> >
>> >> >
>> >> >
>> >> > On Tue, 5 Jan 2016 at 12:31 davidphilip cherian <
>> >> > davidphilipcherian@gmail.com> wrote:
>> >> >
>> >> >> You should use solr softcommit for this use case. So, by setting
>> >> softcommit
>> >> >> to 5 seconds and autoCommit to minute with openSearcher=false should
>> do
>> >> the
>> >> >> work.
>> >> >>
>> >> >>  <autoCommit>
>> >> >>  <maxTime>60000</maxTime>
>> >> >> <openSearcher>false</openSearcher>
>> >> >>  </autoCommit>
>> >> >>
>> >> >> <autoSoftCommit>
>> >> >> <maxTime>2000</maxTime>
>> >> >> </autoSoftCommit>
>> >> >>
>> >> >> Reference link-
>> >> >>
>> >>
>> https://cwiki.apache.org/confluence/display/solr/Near+Real+Time+Searching
>> >> >>
>> >> >> To know more about solr hard and soft commits, have a look at this
>> blog
>> >> :
>> >> >>
>> >> >>
>> >>
>> https://lucidworks.com/blog/2013/08/23/understanding-transaction-logs-softcommit-and-commit-in-sorlcloud/
>> >> >>
>> >> >> On Tue, Jan 5, 2016 at 5:44 PM, Novin Novin <toe.alean@gmail.com>
>> >> wrote:
>> >> >>
>> >> >> > Hi guys,
>> >> >> >
>> >> >> > I'm having trouble to figure what would be idle solr config
for
>> where:
>> >> >> >
>> >> >> > I'm doing hard commit in every minute   for very few number
of
>> users
>> >> >> > because I have to show those docs in search results quickly
when
>> user
>> >> >> save
>> >> >> > the changes.
>> >> >> >
>> >> >> > It is causing the response in around  2 secs to show even
I am
>> getting
>> >> >> only
>> >> >> > 10 records.
>> >> >> >
>> >> >> > Could you able to give some idea where to look at.
>> >> >> >
>> >> >> >
>> >> >> > Thanks in advance,
>> >> >> > Novin
>> >> >> >
>> >> >>
>> >>
>>

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