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Introduction to
Search Systems
Toria Gibbs
Senior Software Engineer @ Etsy
@scarletdrive
2
LEONOR. Macrame wall hanging
$145.00 USDAncestralStore
3
Bread your Cat Costume for Cats
$12.00 USDMissMaddyMakes
4
45MITEMS FOR SALE
AS OF DECEMBER 31, 2016
5
Agenda Main Section One
Main Section Two
Main Section Three
Why Build Search Systems?
Search Indexes
Open Source Tools
Int...
7
Why build search systems?
“Isn’t search a solved problem? We have Google!”
All my friends
Photo by Alissa
loveherbyalissa.etsy.com
title
• Title • Title
Very very large scope Medium scope
No control over content Some control over content
High intent Low...
Why build search systems?
1. Customize the solution (your users, your data, your algorithms)
10
id description price
001 red cat mittens 40.00
002 blue mittens 19.99
003 blue hat for cats 12.50
004 cat hat 25.00
005 re...
12
n = items in database
m = length of string
SUBSTRING SEARCH
O(n·m)
13
n n·m
10 250
100 2500
1000 25000
10000 250000
100000 2500000
1000000 25000000
Database Scalability
m=25
Why build search systems?
1. Customize the solution (your users, your data, your algorithms)
2. Improve performance
14
✓ cat hat
✓ blue hat for cats
✓ vacation hat
? kitten hat
By Laura Solarte
floflyco.etsy.com
SELECT * FROM items
WHERE des...
Why build search systems?
1. Customize the solution (your users, your data, your algorithms)
2. Improve performance
3. Imp...
17
Search Index
Inverted Index
red [001, 005]
blue [002, 003, 005]
cat [001, 003, 004]
hat [003, 004, 005]
mitten [001, 002]
18
001 red ca...
Terminology
red [001, 005]
blue [002, 003, 005]
cat [001, 003, 004]
hat [003, 004, 005]
mitten [001, 002]
19
● A document ...
Terminology
red [001, 005]
blue [002, 003, 005]
cat [001, 003, 004]
hat [003, 004, 005]
mitten [001, 002]
20
● A document ...
Terminology
red [001, 005]
blue [002, 003, 005]
cat [001, 003, 004]
hat [003, 004, 005]
mitten [001, 002]
21
● A document ...
Terminology
red [001, 005]
blue [002, 003, 005]
cat [001, 003, 004]
hat [003, 004, 005]
mitten [001, 002]
22
● A document ...
Terminology
red [001, 005]
blue [002, 003, 005]
cat [001, 003, 004]
hat [003, 004, 005]
mitten [001, 002]
23
● A document ...
red [001, 005]
blue [002, 003, 005]
cat [001, 003, 004]
hat [003, 004, 005]
mitten [001, 002]
001 red cat mittens
002 blue...
string: “cat hat”
array: [“cat”, “hat”]
Tokenization
By Meredith Langley
iheartneedlework.etsy.com
Stemming
By Paradise Crow
ParadiseCrow.etsy.com
“cats” → “cat”
“walking” → “walk”
“painting” → “paint” ?
By Dina Castellano
mamaslilsugarcrochet.etsy.com
Bonus: Synonyms
✓ [“cat”, “kitten”]
✓ [“color”, “colour”]
✓ [“Canada”, “C...
=(
By Ludwinus van den Arend
circuszoo.etsy.com
● Stemming ✓ hat for cats
● Tokenization ✗ vacation
● Synonyms ✓ kitten hat
B...
30
INDEX TIME
O(n·m·p)
QUERY TIME
O(1)
n = items in database
m = length of string
p = preprocessing steps
31
By Lisa Van Riper
humbleelephant.etsy.com
title1. “big data”
2. “small data”
3. “big data”
4. “small data”
5. “big data”
6. “small data”
7. “big data”
8. “small dat...
title1. “Carlos Vives is the
greatest singer alive”
2. “Shakira is the best
dancer in the world”
3. “Sophía Vergara is the...
Did we solve it?
✓ Customize the solution (your users, your data, your algorithms)
✓ Improve performance
✓ Improve quality...
Agenda Main Section One
Main Section Two
Main Section Three
Why Build Search Systems?
Search Indexes
Open Source Tools
Int...
36
Open Source Tools
37
38
● Inverted index
● Field data (uninverted index)
● Basic stemming, tokenizing,
faceting
● Advanced stemming,
tokenizing...
Which one should I pick?
IT DOESN’T MATTER
39
Source
Side by Side with Elasticsearch and Solr
By Rafał Kuć and Radu Gheorghe
https://berlinbuzzwords.de/14/session/side-...
41
<schema name="items" version="1.6">
<types>
<fieldType name="long" class="solr.TrieLongField"/>
<fieldType name="int" c...
Which one should I pick?
Just pick one and get started :)
42
43
Interesting Challenges
Scalability
Relevance
Query Understanding
INTERESTING CHALLENGES
44
45
By Bekki
TresorsDesPyrenees.etsy.com
Data
Users
46
Replication
47
Replication
update
48
Sharding
Distribution
49
50
Scalability
Relevance
Query Understanding
INTERESTING CHALLENGES
51
✓
TF·IDF
58
59
TF-IDF
TF(term) = # times this term appears in doc / total # terms in doc
IDF(term) = loge
(total number of docs / # do...
60
TF-IDF
TF(term) = # times this term appears in doc / total # terms in doc
IDF(term) = loge
(total number of docs / # do...
TF·IDF
61
IDF·Q·R
62
Quality
By Lisa
airfriend.etsy.com
● User reviews
● Clicks
● Favorites
● Adds to shopping cart
● Purchases
● Dwell (time s...
Recency
By Olya
foxberrystudio.etsy.com
● Ensure that each visit is
new and fresh
● New items have a
chance to be seen
Diversity
65
Scalability
Relevance
Query Understanding
INTERESTING CHALLENGES
66
✓
✓
Query Understanding
● Tokenization and stemming
● Language identification
● Spelling correction
● Query rewriting (scoping...
Query Scoping
68
q=“red mittens”
q=“pizza restaurants in
Medellin”
q=“necklace under $20”
q=“mittens” & color=red
q=“pizza...
By Amanda Ellis
GreenChickens.etsy.com
How Etsy Uses Thermodynamics to Help You Search for “Geeky” by Fiona Condon
http://codeascraft.com/2015/08/31/how-etsy-use...
✓
Scalability
Relevance
Query Understanding
INTERESTING CHALLENGES
71
✓
✓
Agenda Main Section One
Main Section Two
Main Section Three
Why Build Search Systems?
Search Indexes
Open Source Tools
Int...
Follow me on Twitter!
@scarletdrive
Thanks!
title
74
We Covered We Did Not Cover
● Stemming
● Tokenization
● Synonyms
● Replication, distribution,
and sharding
● Rank...
Introduction to Search Systems - ScaleConf Colombia 2017
Introduction to Search Systems - ScaleConf Colombia 2017
Introduction to Search Systems - ScaleConf Colombia 2017
Introduction to Search Systems - ScaleConf Colombia 2017
Introduction to Search Systems - ScaleConf Colombia 2017
Introduction to Search Systems - ScaleConf Colombia 2017
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Often when a new user arrives on your website, the first place they go to find information is the search box! Whether they are searching for hotels on your travel site, products on your e-commerce site, or friends to connect with on your social media site, it is important to have fast, effective search in order to engage the user.

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Introduction to Search Systems - ScaleConf Colombia 2017

  1. 1. Introduction to Search Systems Toria Gibbs Senior Software Engineer @ Etsy @scarletdrive
  2. 2. 2
  3. 3. LEONOR. Macrame wall hanging $145.00 USDAncestralStore 3 Bread your Cat Costume for Cats $12.00 USDMissMaddyMakes
  4. 4. 4 45MITEMS FOR SALE AS OF DECEMBER 31, 2016
  5. 5. 5
  6. 6. Agenda Main Section One Main Section Two Main Section Three Why Build Search Systems? Search Indexes Open Source Tools Interesting Challenges in Search
  7. 7. 7 Why build search systems?
  8. 8. “Isn’t search a solved problem? We have Google!” All my friends Photo by Alissa loveherbyalissa.etsy.com
  9. 9. title • Title • Title Very very large scope Medium scope No control over content Some control over content High intent Low intent Optimize for Google users Optimize for Etsy users 9 Google Etsy
  10. 10. Why build search systems? 1. Customize the solution (your users, your data, your algorithms) 10
  11. 11. id description price 001 red cat mittens 40.00 002 blue mittens 19.99 003 blue hat for cats 12.50 004 cat hat 25.00 005 red and blue hat 30.00 11 Database Example q=“cat” SELECT * FROM items WHERE description LIKE ‘%cat%’
  12. 12. 12 n = items in database m = length of string SUBSTRING SEARCH O(n·m)
  13. 13. 13 n n·m 10 250 100 2500 1000 25000 10000 250000 100000 2500000 1000000 25000000 Database Scalability m=25
  14. 14. Why build search systems? 1. Customize the solution (your users, your data, your algorithms) 2. Improve performance 14
  15. 15. ✓ cat hat ✓ blue hat for cats ✓ vacation hat ? kitten hat By Laura Solarte floflyco.etsy.com SELECT * FROM items WHERE description LIKE ‘%cat%’
  16. 16. Why build search systems? 1. Customize the solution (your users, your data, your algorithms) 2. Improve performance 3. Improve quality of results 16
  17. 17. 17 Search Index
  18. 18. Inverted Index red [001, 005] blue [002, 003, 005] cat [001, 003, 004] hat [003, 004, 005] mitten [001, 002] 18 001 red cat mittens 002 blue mittens 003 blue hat for cats 004 cat hat 005 red and blue hat
  19. 19. Terminology red [001, 005] blue [002, 003, 005] cat [001, 003, 004] hat [003, 004, 005] mitten [001, 002] 19 ● A document is a single searchable unit 001 red cat mittens 40.00
  20. 20. Terminology red [001, 005] blue [002, 003, 005] cat [001, 003, 004] hat [003, 004, 005] mitten [001, 002] 20 ● A document is a single searchable unit ● A field is a defined value in a document id description price 001 red cat mittens 40.00
  21. 21. Terminology red [001, 005] blue [002, 003, 005] cat [001, 003, 004] hat [003, 004, 005] mitten [001, 002] 21 ● A document is a single searchable unit ● A field is a defined value in a document ● A term is a value extracted from the source in order to build the inverted index id description price 001 red cat mittens 40.00
  22. 22. Terminology red [001, 005] blue [002, 003, 005] cat [001, 003, 004] hat [003, 004, 005] mitten [001, 002] 22 ● A document is a single searchable unit ● A field is a defined value in a document ● A term is a value extracted from the source in order to build the inverted index ● An inverted index is an internal data structure that maps terms of a field to document ids
  23. 23. Terminology red [001, 005] blue [002, 003, 005] cat [001, 003, 004] hat [003, 004, 005] mitten [001, 002] 23 ● A document is a single searchable unit ● A field is a defined value in a document ● A term is a value extracted from the source in order to build the inverted index ● An inverted index is an internal data structure that maps terms of a field to document ids ● An index is a collection of documents 12.50 [003] 19.99 [002] 25.00 [004] 30.00 [005] 40.00 [001] 001 red cat mittens 40.00 002 blue mittens 19.99 ... ... ...
  24. 24. red [001, 005] blue [002, 003, 005] cat [001, 003, 004] hat [003, 004, 005] mitten [001, 002] 001 red cat mittens 002 blue mittens 003 blue hat for cats 004 cat hat 005 red and blue hat How did we do this?
  25. 25. string: “cat hat” array: [“cat”, “hat”] Tokenization By Meredith Langley iheartneedlework.etsy.com
  26. 26. Stemming By Paradise Crow ParadiseCrow.etsy.com “cats” → “cat” “walking” → “walk” “painting” → “paint” ?
  27. 27. By Dina Castellano mamaslilsugarcrochet.etsy.com Bonus: Synonyms ✓ [“cat”, “kitten”] ✓ [“color”, “colour”] ✓ [“Canada”, “Canadian”, “canuck”] ✗ [“Poland”, “Polish”]
  28. 28. =(
  29. 29. By Ludwinus van den Arend circuszoo.etsy.com ● Stemming ✓ hat for cats ● Tokenization ✗ vacation ● Synonyms ✓ kitten hat Building an Inverted Index
  30. 30. 30 INDEX TIME O(n·m·p) QUERY TIME O(1) n = items in database m = length of string p = preprocessing steps
  31. 31. 31 By Lisa Van Riper humbleelephant.etsy.com
  32. 32. title1. “big data” 2. “small data” 3. “big data” 4. “small data” 5. “big data” 6. “small data” 7. “big data” 8. “small data” 9. “big data” 10. “small data” 11. “bigger data” 12. “biggest data” data=[1,2,3,4,5,6,7,8,9,10,11,12] big=[1,3,5,7,9,11,12] small=[2,4,6,8,10] 32
  33. 33. title1. “Carlos Vives is the greatest singer alive” 2. “Shakira is the best dancer in the world” 3. “Sophía Vergara is the most famous Colombian in the United States” carlos=[1] vives=[1] is=[1,2,3] the=[1,2,3] great=[1] singer=[1] alive=[1] shakira=[2] best=[2] dancer=[2] in=[2,3] world=[2] sophia=[3] vergara=[3] most=[3] famous=[3] colombia=[3] unite=[3] states=[3] 33
  34. 34. Did we solve it? ✓ Customize the solution (your users, your data, your algorithms) ✓ Improve performance ✓ Improve quality of results 34
  35. 35. Agenda Main Section One Main Section Two Main Section Three Why Build Search Systems? Search Indexes Open Source Tools Interesting Challenges in Search ✓ ✓
  36. 36. 36 Open Source Tools
  37. 37. 37
  38. 38. 38 ● Inverted index ● Field data (uninverted index) ● Basic stemming, tokenizing, faceting ● Advanced stemming, tokenizing, faceting ● Plugins ● Caching, warming ● Replication ● Sharding, distribution ● ...and more!
  39. 39. Which one should I pick? IT DOESN’T MATTER 39
  40. 40. Source Side by Side with Elasticsearch and Solr By Rafał Kuć and Radu Gheorghe https://berlinbuzzwords.de/14/session/side-side-elasticsearch-and-solr https://berlinbuzzwords.de/15/session/side-side-elasticsearch-solr-part-2-performance-scalability See also http://solr-vs-elasticsearch.com/ By Kelvin Tan 40 It Doesn’t Matter ● Most projects work well with either ● Getting configuration right is more important ● Test with your own data and your own queries
  41. 41. 41 <schema name="items" version="1.6"> <types> <fieldType name="long" class="solr.TrieLongField"/> <fieldType name="int" class="solr.TrieField" type="integer"/> <fieldType name="tdate" class="solr.TrieDateField"/> <fieldType name="text" class="solr.TextField"/> </types> <fields> <field name="item_id" type="long" stored="true" required="true"/> <field name="description" type="text"/> <field name="quantity" type="int"/> <field name="price" type="long"/> <field name="update_date" type="tdate"/> </fields> <defaultSearchField>description</defaultSearchField> <uniqueKey>item_id</uniqueKey> </schema> "item" : { "properties" : { "item_id": { "type": "long", "store": true }, "description": { "type": "string" }, "quantity": { "type": "int" }, "price": { "type": "long" }, "update_date": { "type": "date" } } }
  42. 42. Which one should I pick? Just pick one and get started :) 42
  43. 43. 43 Interesting Challenges
  44. 44. Scalability Relevance Query Understanding INTERESTING CHALLENGES 44
  45. 45. 45 By Bekki TresorsDesPyrenees.etsy.com Data Users
  46. 46. 46 Replication
  47. 47. 47 Replication update
  48. 48. 48 Sharding Distribution
  49. 49. 49
  50. 50. 50
  51. 51. Scalability Relevance Query Understanding INTERESTING CHALLENGES 51 ✓
  52. 52. TF·IDF 58
  53. 53. 59 TF-IDF TF(term) = # times this term appears in doc / total # terms in doc IDF(term) = loge (total number of docs / # docs which contain this term) 1. The orange cat is a very good cat 2. My cat ate an orange 3. Cats are the best and I will give every cat a special cat toy 1. TF(cat) = 2/8 2. TF(cat) = 1/5 3. TF(cat) = 3/14 IDF(cat) = loge (3/3) “cat” → [1, 3, 2]
  54. 54. 60 TF-IDF TF(term) = # times this term appears in doc / total # terms in doc IDF(term) = loge (total number of docs / # docs which contain this term) 1. The orange cat is a very good cat 2. My cat ate an orange 3. Cats are the best and I will give every cat a special cat toy cat cat cat cat cat 1. TF(cat) = 2/8 2. TF(cat) = 1/5 3. TF(cat) = 8/19 IDF(cat) = loge (3/3) “cat” → [3, 1, 2]
  55. 55. TF·IDF 61
  56. 56. IDF·Q·R 62
  57. 57. Quality By Lisa airfriend.etsy.com ● User reviews ● Clicks ● Favorites ● Adds to shopping cart ● Purchases ● Dwell (time spent viewing the item) ● ...and more!
  58. 58. Recency By Olya foxberrystudio.etsy.com ● Ensure that each visit is new and fresh ● New items have a chance to be seen
  59. 59. Diversity 65
  60. 60. Scalability Relevance Query Understanding INTERESTING CHALLENGES 66 ✓ ✓
  61. 61. Query Understanding ● Tokenization and stemming ● Language identification ● Spelling correction ● Query rewriting (scoping, expansion, relaxation) For more information http://queryunderstanding.com/ By Daniel Tunkelang 67
  62. 62. Query Scoping 68 q=“red mittens” q=“pizza restaurants in Medellin” q=“necklace under $20” q=“mittens” & color=red q=“pizza restaurant” & location=“Medellin” q=“necklace” & price<20
  63. 63. By Amanda Ellis GreenChickens.etsy.com
  64. 64. How Etsy Uses Thermodynamics to Help You Search for “Geeky” by Fiona Condon http://codeascraft.com/2015/08/31/how-etsy-uses-thermodynamics-to-help-you-search-for-geeky
  65. 65. ✓ Scalability Relevance Query Understanding INTERESTING CHALLENGES 71 ✓ ✓
  66. 66. Agenda Main Section One Main Section Two Main Section Three Why Build Search Systems? Search Indexes Open Source Tools Interesting Challenges in Search ✓ ✓ ✓ ✓
  67. 67. Follow me on Twitter! @scarletdrive Thanks!
  68. 68. title 74 We Covered We Did Not Cover ● Stemming ● Tokenization ● Synonyms ● Replication, distribution, and sharding ● Ranking for relevance ● Query understanding ● Faceting ● Field data ● Internationalization ● Spelling correction ● Autocomplete suggestions
  • NicholasMwakatobe

    Feb. 16, 2019
  • juliangeo

    Mar. 26, 2017
  • AlexanderCano2

    Mar. 26, 2017
  • andhdo

    Mar. 26, 2017

Often when a new user arrives on your website, the first place they go to find information is the search box! Whether they are searching for hotels on your travel site, products on your e-commerce site, or friends to connect with on your social media site, it is important to have fast, effective search in order to engage the user.

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