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From "David Parks" <davidpark...@yahoo.com>
Subject Slow queries for common terms
Date Thu, 21 Mar 2013 10:09:05 GMT
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>

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