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From Vamsee Yarlagadda <vam...@cloudera.com>
Subject Re: Question on multi-threaded faceting
Date Sat, 02 Aug 2014 00:30:53 GMT
I filed https://issues.apache.org/jira/browse/SOLR-6314 to track this issue
going forward.
Any ideas around this problem?

Thanks,
Vamsee


On Tue, Jul 29, 2014 at 4:00 PM, Vamsee Yarlagadda <vamsee@cloudera.com>
wrote:

> Hi,
>
>     I am trying to work with multi-threaded faceting on SolrCloud and in
> the process i was hit by some issues.
>
> I am currently running the below upstream test on different SolrCloud
> configurations and i am getting a different result set per configuration.
>
> https://github.com/apache/lucene-solr/blob/trunk/solr/core/src/test/org/apache/solr/request/TestFaceting.java#L654
>
> Setup:
> ** Indexed 50 docs into SolrCloud.*
>
> ** If the SolrCloud has only 1 shard, the facet field query has the below
> output (which matches with the expected upstream test output - # facet
> fields ~ 50
> <https://github.com/apache/lucene-solr/blob/trunk/solr/core/src/test/org/apache/solr/request/TestFaceting.java#L716>).*
>
>
>> $ curl  "
>> http://localhost:8983/solr/collection1/select?facet=true&fl=id&indent=true&q=id%3A*&facet.limit=-1&facet.threads=1000&facet.field=f0_ws&facet.field=f0_ws&facet.field=f0_ws&facet.field=f0_ws&facet.field=f0_ws&facet.field=f1_ws&facet.field=f1_ws&facet.field=f1_ws&facet.field=f1_ws&facet.field=f1_ws&facet.field=f2_ws&facet.field=f2_ws&facet.field=f2_ws&facet.field=f2_ws&facet.field=f2_ws&facet.field=f3_ws&facet.field=f3_ws&facet.field=f3_ws&facet.field=f3_ws&facet.field=f3_ws&facet.field=f4_ws&facet.field=f4_ws&facet.field=f4_ws&facet.field=f4_ws&facet.field=f4_ws&facet.field=f5_ws&facet.field=f5_ws&facet.field=f5_ws&facet.field=f5_ws&facet.field=f5_ws&facet.field=f6_ws&facet.field=f6_ws&facet.field=f6_ws&facet.field=f6_ws&facet.field=f6_ws&facet.field=f7_ws&facet.field=f7_ws&facet.field=f7_ws&facet.field=f7_ws&facet.field=f7_ws&facet.field=f8_ws&facet.field=f8_ws&facet.field=f8_ws&facet.field=f8_ws&facet.field=f8_ws&facet.field=f9_ws&facet.field=f9_ws&facet.field=f9_ws&facet.field=f9_ws&facet.field=f9_ws&rows=1&wt=xml
>> "
>>
>> <?xml version="1.0" encoding="UTF-8"?>
>> <response>
>> <lst name="responseHeader">
>>   <int name="status">0</int>
>>   <int name="QTime">21</int>
>>   <lst name="params">
>>     <str name="facet">true</str>
>>     <str name="fl">id</str>
>>     <str name="indent">true</str>
>>     <str name="q">id:*</str>
>>     <str name="facet.limit">-1</str>
>>     <str name="facet.threads">1000</str>
>>     <arr name="facet.field">
>
>       <str>f0_ws</str>
>>       <str>f0_ws</str>
>>       <str>f0_ws</str>
>>       <str>f0_ws</str>
>>       <str>f0_ws</str>
>>       <str>f1_ws</str>
>>       <str>f1_ws</str>
>>       <str>f1_ws</str>
>>       <str>f1_ws</str>
>>       <str>f1_ws</str>
>>       <str>f2_ws</str>
>>       <str>f2_ws</str>
>>       <str>f2_ws</str>
>>       <str>f2_ws</str>
>>       <str>f2_ws</str>
>>       <str>f3_ws</str>
>>       <str>f3_ws</str>
>>       <str>f3_ws</str>
>>       <str>f3_ws</str>
>>       <str>f3_ws</str>
>>       <str>f4_ws</str>
>>       <str>f4_ws</str>
>>       <str>f4_ws</str>
>>       <str>f4_ws</str>
>>       <str>f4_ws</str>
>>       <str>f5_ws</str>
>>       <str>f5_ws</str>
>>       <str>f5_ws</str>
>>       <str>f5_ws</str>
>>       <str>f5_ws</str>
>>       <str>f6_ws</str>
>>       <str>f6_ws</str>
>>       <str>f6_ws</str>
>>       <str>f6_ws</str>
>>       <str>f6_ws</str>
>>       <str>f7_ws</str>
>>       <str>f7_ws</str>
>
>       <str>f7_ws</str>
>>       <str>f7_ws</str>
>>       <str>f7_ws</str>
>>       <str>f8_ws</str>
>>       <str>f8_ws</str>
>>       <str>f8_ws</str>
>>       <str>f8_ws</str>
>>       <str>f8_ws</str>
>>       <str>f9_ws</str>
>>       <str>f9_ws</str>
>>       <str>f9_ws</str>
>>       <str>f9_ws</str>
>>       <str>f9_ws</str>
>>     </arr>
>>     <str name="wt">xml</str>
>>     <str name="rows">1</str>
>>   </lst>
>> </lst>
>> <result name="response" numFound="50" start="0">
>>   <doc>
>>     <float name="id">0.0</float></doc>
>> </result>
>> <lst name="facet_counts">
>>   <lst name="facet_queries"/>
>>   <lst name="facet_fields">
>>     <lst name="f0_ws">
>>       <int name="zero_1">25</int>
>>       <int name="zero_2">25</int>
>>     </lst>
>>     <lst name="f0_ws">
>>       <int name="zero_1">25</int>
>>       <int name="zero_2">25</int>
>>     </lst>
>>     <lst name="f0_ws">
>>       <int name="zero_1">25</int>
>>       <int name="zero_2">25</int>
>>     </lst>
>>     <lst name="f0_ws">
>>       <int name="zero_1">25</int>
>>       <int name="zero_2">25</int>
>>     </lst>
>>     <lst name="f0_ws">
>>       <int name="zero_1">25</int>
>>       <int name="zero_2">25</int>
>>     </lst>
>>     <lst name="f1_ws">
>>       <int name="one_1">33</int>
>>       <int name="one_3">17</int>
>>     </lst>
>>     <lst name="f1_ws">
>>       <int name="one_1">33</int>
>>       <int name="one_3">17</int>
>>     </lst>
>>     <lst name="f1_ws">
>>       <int name="one_1">33</int>
>>       <int name="one_3">17</int>
>>     </lst>
>>     <lst name="f1_ws">
>>       <int name="one_1">33</int>
>>       <int name="one_3">17</int>
>>     </lst>
>>     <lst name="f1_ws">
>>       <int name="one_1">33</int>
>>       <int name="one_3">17</int>
>>     </lst>
>>     <lst name="f2_ws">
>>       <int name="two_1">37</int>
>>       <int name="two_4">13</int>
>>     </lst>
>>     <lst name="f2_ws">
>>       <int name="two_1">37</int>
>>       <int name="two_4">13</int>
>>     </lst>
>>     <lst name="f2_ws">
>>       <int name="two_1">37</int>
>>       <int name="two_4">13</int>
>>     </lst>
>>     <lst name="f2_ws">
>>       <int name="two_1">37</int>
>>       <int name="two_4">13</int>
>>     </lst>
>>     <lst name="f2_ws">
>>       <int name="two_1">37</int>
>>       <int name="two_4">13</int>
>>     </lst>
>>     <lst name="f3_ws">
>>       <int name="three_1">40</int>
>>       <int name="three_5">10</int>
>>     </lst>
>
>
>>     <lst name="f3_ws">
>>       <int name="three_1">40</int>
>>       <int name="three_5">10</int>
>>     </lst>
>>     <lst name="f3_ws">
>>       <int name="three_1">40</int>
>>       <int name="three_5">10</int>
>>     </lst>
>>     <lst name="f3_ws">
>>       <int name="three_1">40</int>
>>       <int name="three_5">10</int>
>>     </lst>
>>     <lst name="f3_ws">
>>       <int name="three_1">40</int>
>>       <int name="three_5">10</int>
>>     </lst>
>>     <lst name="f4_ws">
>>       <int name="four_1">41</int>
>>       <int name="four_6">9</int>
>>     </lst>
>>     <lst name="f4_ws">
>>       <int name="four_1">41</int>
>>       <int name="four_6">9</int>
>>     </lst>
>>     <lst name="f4_ws">
>>       <int name="four_1">41</int>
>>       <int name="four_6">9</int>
>>     </lst>
>>     <lst name="f4_ws">
>>       <int name="four_1">41</int>
>>       <int name="four_6">9</int>
>>     </lst>
>>     <lst name="f4_ws">
>>       <int name="four_1">41</int>
>>       <int name="four_6">9</int>
>>     </lst>
>>     <lst name="f5_ws">
>>       <int name="five_1">42</int>
>>       <int name="five_7">8</int>
>>     </lst>
>>     <lst name="f5_ws">
>>       <int name="five_1">42</int>
>>       <int name="five_7">8</int>
>>     </lst>
>>     <lst name="f5_ws">
>>       <int name="five_1">42</int>
>>       <int name="five_7">8</int>
>>     </lst>
>>     <lst name="f5_ws">
>>       <int name="five_1">42</int>
>>       <int name="five_7">8</int>
>>     </lst>
>>     <lst name="f5_ws">
>>       <int name="five_1">42</int>
>>       <int name="five_7">8</int>
>>     </lst>
>>     <lst name="f6_ws">
>>       <int name="six_1">43</int>
>>       <int name="six_8">7</int>
>
>
>>     </lst>
>>     <lst name="f6_ws">
>>       <int name="six_1">43</int>
>>       <int name="six_8">7</int>
>>     </lst>
>>     <lst name="f6_ws">
>>       <int name="six_1">43</int>
>>       <int name="six_8">7</int>
>>     </lst>
>>     <lst name="f6_ws">
>>       <int name="six_1">43</int>
>>       <int name="six_8">7</int>
>>     </lst>
>>     <lst name="f6_ws">
>>       <int name="six_1">43</int>
>>       <int name="six_8">7</int>
>>     </lst>
>>     <lst name="f7_ws">
>>       <int name="seven_1">44</int>
>>       <int name="seven_9">6</int>
>>     </lst>
>>     <lst name="f7_ws">
>>       <int name="seven_1">44</int>
>>       <int name="seven_9">6</int>
>>     </lst>
>>     <lst name="f7_ws">
>>       <int name="seven_1">44</int>
>>       <int name="seven_9">6</int>
>>     </lst>
>>     <lst name="f7_ws">
>>       <int name="seven_1">44</int>
>>       <int name="seven_9">6</int>
>>     </lst>
>>     <lst name="f7_ws">
>>       <int name="seven_1">44</int>
>>       <int name="seven_9">6</int>
>>     </lst>
>>     <lst name="f8_ws">
>>       <int name="eight_1">45</int>
>>       <int name="eight_10">5</int>
>>     </lst>
>>     <lst name="f8_ws">
>>       <int name="eight_1">45</int>
>>       <int name="eight_10">5</int>
>>     </lst>
>>     <lst name="f8_ws">
>>       <int name="eight_1">45</int>
>>       <int name="eight_10">5</int>
>>     </lst>
>>     <lst name="f8_ws">
>>       <int name="eight_1">45</int>
>>       <int name="eight_10">5</int>
>>     </lst>
>>     <lst name="f8_ws">
>>       <int name="eight_1">45</int>
>>       <int name="eight_10">5</int>
>>     </lst>
>>     <lst name="f9_ws">
>>       <int name="nine_1">45</int>
>>       <int name="nine_11">5</int>
>>     </lst>
>>     <lst name="f9_ws">
>>       <int name="nine_1">45</int>
>>       <int name="nine_11">5</int>
>>     </lst>
>
>
>>     <lst name="f9_ws">
>>       <int name="nine_1">45</int>
>>       <int name="nine_11">5</int>
>>     </lst>
>>     <lst name="f9_ws">
>>       <int name="nine_1">45</int>
>>       <int name="nine_11">5</int>
>>     </lst>
>>     <lst name="f9_ws">
>>       <int name="nine_1">45</int>
>>       <int name="nine_11">5</int>
>>     </lst>
>>   </lst>
>>   <lst name="facet_dates"/>
>>   <lst name="facet_ranges"/>
>> </lst>
>> </response>
>
>
>
> ** Now, if a create a new collection with 2 shards (>1 shard SolrCloud),
> the same above query results in a different output. (# facet fields ~ 10 ;
>  Expected 50)*
>
>
>> $ curl  "
>> http://localhost:8983/solr/collection1/select?facet=true&fl=id&indent=true&q=id%3A*&facet.limit=-1&facet.threads=1000&facet.field=f0_ws&facet.field=f0_ws&facet.field=f0_ws&facet.field=f0_ws&facet.field=f0_ws&facet.field=f1_ws&facet.field=f1_ws&facet.field=f1_ws&facet.field=f1_ws&facet.field=f1_ws&facet.field=f2_ws&facet.field=f2_ws&facet.field=f2_ws&facet.field=f2_ws&facet.field=f2_ws&facet.field=f3_ws&facet.field=f3_ws&facet.field=f3_ws&facet.field=f3_ws&facet.field=f3_ws&facet.field=f4_ws&facet.field=f4_ws&facet.field=f4_ws&facet.field=f4_ws&facet.field=f4_ws&facet.field=f5_ws&facet.field=f5_ws&facet.field=f5_ws&facet.field=f5_ws&facet.field=f5_ws&facet.field=f6_ws&facet.field=f6_ws&facet.field=f6_ws&facet.field=f6_ws&facet.field=f6_ws&facet.field=f7_ws&facet.field=f7_ws&facet.field=f7_ws&facet.field=f7_ws&facet.field=f7_ws&facet.field=f8_ws&facet.field=f8_ws&facet.field=f8_ws&facet.field=f8_ws&facet.field=f8_ws&facet.field=f9_ws&facet.field=f9_ws&facet.field=f9_ws&facet.field=f9_ws&facet.field=f9_ws&rows=1&wt=xml
>> "
>>
>
> <?xml version="1.0" encoding="UTF-8"?>
>> <response>
>> <lst name="responseHeader">
>>   <int name="status">0</int>
>>   <int name="QTime">31</int>
>>   <lst name="params">
>>     <str name="facet">true</str>
>>     <str name="fl">id</str>
>>     <str name="indent">true</str>
>>     <str name="q">id:*</str>
>>     <str name="facet.limit">-1</str>
>>     <str name="facet.threads">1000</str>
>>     <arr name="facet.field">
>>       <str>f0_ws</str>
>>       <str>f0_ws</str>
>>       <str>f0_ws</str>
>>       <str>f0_ws</str>
>>       <str>f0_ws</str>
>>       <str>f1_ws</str>
>>       <str>f1_ws</str>
>>       <str>f1_ws</str>
>>       <str>f1_ws</str>
>>       <str>f1_ws</str>
>>       <str>f2_ws</str>
>>       <str>f2_ws</str>
>>       <str>f2_ws</str>
>>       <str>f2_ws</str>
>>       <str>f2_ws</str>
>>       <str>f3_ws</str>
>>       <str>f3_ws</str>
>>       <str>f3_ws</str>
>>       <str>f3_ws</str>
>>       <str>f3_ws</str>
>>       <str>f4_ws</str>
>>       <str>f4_ws</str>
>>       <str>f4_ws</str>
>>       <str>f4_ws</str>
>>       <str>f4_ws</str>
>>       <str>f5_ws</str>
>>       <str>f5_ws</str>
>>       <str>f5_ws</str>
>>       <str>f5_ws</str>
>>       <str>f5_ws</str>
>>       <str>f6_ws</str>
>>       <str>f6_ws</str>
>>       <str>f6_ws</str>
>>       <str>f6_ws</str>
>>       <str>f6_ws</str>
>>       <str>f7_ws</str>
>>       <str>f7_ws</str>
>>       <str>f7_ws</str>
>>       <str>f7_ws</str>
>>       <str>f7_ws</str>
>>       <str>f8_ws</str>
>>       <str>f8_ws</str>
>>       <str>f8_ws</str>
>>       <str>f8_ws</str>
>>       <str>f8_ws</str>
>>       <str>f9_ws</str>
>>       <str>f9_ws</str>
>>       <str>f9_ws</str>
>>       <str>f9_ws</str>
>>       <str>f9_ws</str>
>>     </arr>
>>     <str name="wt">xml</str>
>>     <str name="rows">1</str>
>>   </lst>
>> </lst>
>> <result name="response" numFound="50" start="0" maxScore="1.0">
>>   <doc>
>>     <float name="id">2.0</float></doc>
>> </result>
>> <lst name="facet_counts">
>>   <lst name="facet_queries"/>
>>   <lst name="facet_fields">
>>     <lst name="f0_ws">
>>       <int name="zero_1">25</int>
>>       <int name="zero_2">25</int>
>>     </lst>
>>     <lst name="f1_ws">
>>       <int name="one_1">33</int>
>>       <int name="one_3">17</int>
>>     </lst>
>>     <lst name="f2_ws">
>>       <int name="two_1">37</int>
>>       <int name="two_4">13</int>
>>     </lst>
>>     <lst name="f3_ws">
>>       <int name="three_1">40</int>
>>       <int name="three_5">10</int>
>>     </lst>
>>     <lst name="f4_ws">
>>       <int name="four_1">41</int>
>>       <int name="four_6">9</int>
>>     </lst>
>>     <lst name="f5_ws">
>>       <int name="five_1">42</int>
>>       <int name="five_7">8</int>
>>     </lst>
>>     <lst name="f6_ws">
>>       <int name="six_1">43</int>
>>       <int name="six_8">7</int>
>>     </lst>
>>     <lst name="f7_ws">
>>       <int name="seven_1">44</int>
>>       <int name="seven_9">6</int>
>>     </lst>
>>     <lst name="f8_ws">
>>       <int name="eight_1">45</int>
>>       <int name="eight_10">5</int>
>>     </lst>
>>     <lst name="f9_ws">
>>       <int name="nine_1">45</int>
>>       <int name="nine_11">5</int>
>>     </lst>
>>   </lst>
>>   <lst name="facet_dates"/>
>>   <lst name="facet_ranges"/>
>> </lst>
>> </response>
>
>
>
>  I actually feel this behavior is quite strange as it is being dependent
> on the number of shards in SolrCloud. I would really appreciate if someone
> can explain this behavior. If it is indeed a bug, i will file a Solr Jira.
>
> Thanks,
> Vamsee
>

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