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Posted to solr-user@lucene.apache.org by David Parks <da...@frugg.com> on 2013/03/21 10:40:58 UTC
Slow queries for common terms
I've got a query that takes 15 seconds to return whenever I have the term "book" in a query that isn't cached. That's a pretty common term in our search index. We're indexing about 120 GB of text data. We only store terms and IDs, no document data, and the disk is virtually unused, it's all CPU time.
I haven't done much yet to optimizing and scale solr, as we're only trying to support a small number of users in a private beta. I currently only have a couple of gigs of ram dedicated to Solr (we've ordered more hardware for it, but it's not in yet).
I wonder if there's something I can do in the short term to alleviate the problem. Many searches work great, but these ones that take 15+ sec are a black eye. I'd be happy with a short term fix followed in the near future by a more proper long-term fix.
If I were to take a stab at this I'd say the following two are the short and long term solutions:
* Short: Configure solr to short-circuit quries, thus reducing query quality, but guaranteeing a certain response time (I'm ok with this tradeoff, but is this possible or contains risks I need to consider more?)
* Long: Implement sharding, get more hardware resources for these boxes and split up the index across multiple servers.
Am I on track in my thinking here?
Thanks,
David
My long query:
<?xml version="1.0" encoding="UTF-8"?>
<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">15464</int>
<lst name="params">
<str name="debugQuery">true</str>
<str name="indent">true</str>
<str name="q">cook book fourth baby
</str>
<str name="wt">xml</str>
</lst>
</lst>
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<str name="id">1004505170125</str>
<long name="facetime">0</long>
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</result>
<lst name="debug">
<str name="rawquerystring">cook book fourth baby
</str>
<str name="querystring">cook book fourth baby
</str>
<str name="parsedquery">all:cook all:book all:fourth all:babi</str>
<str name="parsedquery_toString">all:cook all:book all:fourth all:babi</str>
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<double name="time">0.0</double>
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<lst name="highlight">
<double name="time">0.0</double>
</lst>
<lst name="stats">
<double name="time">0.0</double>
</lst>
<lst name="debug">
<double name="time">0.0</double>
</lst>
</lst>
<lst name="process">
<double name="time">15463.0</double>
<lst name="query">
<double name="time">15411.0</double>
</lst>
<lst name="facet">
<double name="time">0.0</double>
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<lst name="mlt">
<double name="time">0.0</double>
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<lst name="highlight">
<double name="time">0.0</double>
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<lst name="stats">
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</lst>
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</response>
Re: Slow queries for common terms
Posted by Ahmet Arslan <io...@yahoo.com>.
Hi David,
I happen to know CommonTermsQuery added recently. But now sure how to use it.
http://lucene.apache.org/core/4_1_0/queries/org/apache/lucene/queries/CommonTermsQuery.html
--- On Thu, 3/21/13, David Parks <da...@frugg.com> wrote:
> From: David Parks <da...@frugg.com>
> Subject: Slow queries for common terms
> To: "solr-user@lucene.apache.org" <so...@lucene.apache.org>
> Date: Thursday, March 21, 2013, 11:40 AM
> I've got a query that takes 15
> seconds to return whenever I have the term "book" in a query
> that isn't cached. That's a pretty common term in our search
> index. We're indexing about 120 GB of text data. We only
> store terms and IDs, no document data, and the disk is
> virtually unused, it's all CPU time.
>
> I haven't done much yet to optimizing and scale solr, as
> we're only trying to support a small number of users in a
> private beta. I currently only have a couple of gigs of ram
> dedicated to Solr (we've ordered more hardware for it, but
> it's not in yet).
>
> I wonder if there's something I can do in the short term to
> alleviate the problem. Many searches work great, but these
> ones that take 15+ sec are a black eye. I'd be happy with a
> short term fix followed in the near future by a more proper
> long-term fix.
>
> If I were to take a stab at this I'd say the following two
> are the short and long term solutions:
>
> * Short: Configure
> solr to short-circuit quries, thus reducing query quality,
> but guaranteeing a certain response time (I'm ok with this
> tradeoff, but is this possible or contains risks I need to
> consider more?)
>
> * Long: Implement
> sharding, get more hardware resources for these boxes and
> split up the index across multiple servers.
>
> Am I on track in my thinking here?
> Thanks,
> David
>
> My long query:
> <?xml version="1.0" encoding="UTF-8"?>
> <response>
>
> <lst name="responseHeader">
> <int name="status">0</int>
> <int name="QTime">15464</int>
> <lst name="params">
> <str name="debugQuery">true</str>
> <str name="indent">true</str>
> <str name="q">cook book fourth baby
> </str>
> <str name="wt">xml</str>
> </lst>
> </lst>
> <result name="response" numFound="91695127"
> start="0">
> <doc>
> <str
> name="id">1004505170125</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428753459934396420</long></doc>
> <doc>
> <str
> name="id">1005401904542</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428760446538612739</long></doc>
> <doc>
> <str
> name="id">1003707566177</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428772178357125123</long></doc>
> <doc>
> <str
> name="id">1000610053924</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428787238421921794</long></doc>
> <doc>
> <str
> name="id">1000611651986</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428796273825153026</long></doc>
> <doc>
> <str
> name="id">1001419625706</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428823418682212355</long></doc>
> <doc>
> <str
> name="id">1004804435353</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428823070202658818</long></doc>
> <doc>
> <str
> name="id">1000514089336</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428755943804370945</long></doc>
> <doc>
> <str
> name="id">1000329540261</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428805063523958786</long></doc>
> <doc>
> <str
> name="id">1001607999738</str>
> <long name="facetime">0</long>
> <long
> name="_version_">1428757460650295298</long></doc>
> </result>
> <lst name="debug">
> <str name="rawquerystring">cook book fourth
> baby
> </str>
> <str name="querystring">cook book fourth baby
> </str>
> <str name="parsedquery">all:cook all:book
> all:fourth all:babi</str>
> <str name="parsedquery_toString">all:cook
> all:book all:fourth all:babi</str>
> <lst name="explain">
> <str name="1004505170125">
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> [DefaultSimilarity], result of:
> 7.988946 = score(doc=3428426,freq=2.0 =
> termFreq=2.0
> ), product of:
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