Open Source Search FTW

2. © 2013 LucidWorks 2 Preaching to the Converted! • Embrace fuzziness! • Search is a system building block • If the algorithms fit, use them! • Search use leads to search abuse • Scoring features are everywhere http://cheezburger.com/5243950080

5. © 2013 LucidWorks Relax, You’re Among Friends • Large, diverse search community with many non-traditional search engine usages - Object stores, Record linkage, Social, mobile -> web • Open Dev. > Open Source • ―The Apache Way‖ - Meritocracy – Those who do, decide! • Always Be Testing - Randomized system tests are all the rage - http://vimeo.com/32087114 • Patches Welcome!

8. © 2013 LucidWorks Lucene: Speed and Memory • Native Near Real Time (NRT) support - Per segment - FieldCache can be controlled to only load new segments - Soft commit -- faster without fsync, allows quicker update visibility • DWPT (Document Writer per Thread) - Faster more consistent index speed • Faster fuzzy & wildcard query processing • String -> BytesRef - Much improved data structure - … means less memory and less garbage collection effort

10. © 2013 LucidWorks Lucene: Flexibility • Flexible Index Formats - New posting list codecs: Block, Simple Text, Append (HDFS..), etc - Pulsing codec: improves performance of primary key searches, inlining docs, positions, and payloads, saves disk seeks • Pluggable Scoring - Decoupled from TF/IDF - Built in alternatives include BM25 & DFR, and others » http://en.wikipedia.org/wiki/Okapi_BM25 » http://terrier.org/docs/v3.5/dfr_description.html - Add your own

11. © 2013 LucidWorks FS(A|T) • Keys: - byte[] – write-once - Linear time build of min. automata (nlogn if not sorted) - Compression - Reverse lookups - Weights (used for auto-suggest) - Pluggable Algebra • Uses: - Term Dictionary, TokenStreams, Japanese, synonyms, spelling, others - FuzzyQuery is 100x faster -- http://bit.ly/hgO65c • More: - http://slidesha.re/vKtpVA - http://bit.ly/Pkjyu0 - ―Smaller Representation of Finite State Automata‖ » Proc. of the 16th Inter. Conf. on Implementation and Application of Automata, CIAA'2011, vol. 6807, 2011, pp. 118—192.

13. © 2013 LucidWorks Solr 4: New Features • Search/Faceting/Relevance - New Relevance Function Queries (tf, df, others) - Pivot Faceting - Pseudo-join - Improved Spatial (more later) - Full support for Lucene Codecs, pluggable scoring • Indexing - New Update Processors, including scripting option - Near real time • Codec/Similarity support from Lucene 4 • Other - New Admin UI

14. © 2013 LucidWorks Geospatial improvements • Index shapes other than points (circles, polygons, etc) • More complex interactions than point in a circle • Indexing: - "geo‖:‖43.17614,-90.57341‖ - ―geo‖:‖Circle(4.56,1.23 d=0.0710)‖ - ―geo‖:‖POLYGON((-10 30, -40 40, -10 -20, 40 20, 0 0, -10 30))‖ • Searching: - fq=geo:"Intersects(-74.093 41.042 -69.347 44.558)" - fq=geo:"Intersects(POLYGON((-10 30, -40 40, -10 -20, 40 20, 0 0, -10 30)))‖

15. © 2013 LucidWorks Scaling Solr • Distributed/sharded indexing & search - Auto distributes updates and queries to appropriate shards - Near Real Time (NRT) indexing capable • Dynamically scalable - New SolrCloud instances add indexing and query capacity - Supports re-balancing • Reliable - No single point of failure - Transactions logged - Robust, automatic recover • http://wiki.apache.org/solr/SolrCloud

16. © 2013 LucidWorks 16 New in 4.4 (just released) • HDFS backed directory for storing index and transaction logs in Apache Hadoop • New Core discovery capabilities • Schemaless/External Schema/Field Guessing • Schema APIs • Add documents from the Admin UI

18. © 2013 LucidWorks … Find your Keys, Store Your Content • Lucene/Solr is a fast key-value store - Bonus: search your values! • NoSQL before NoSQL was cool • Solr: distributed key/value - Durable, Isolated, Redundant, Fast, Real-time - Joins, Column Storage • Solr or Tika + Lucene can index popular office formats • Solr can backup/replicate and scale as content grows

19. © 2013 LucidWorks … Find Love! Upsell! Cross-sell! • Cross recommendation as search - with search used to build cross recommendation! • Recommend content to people who exhibit certain behaviors (clicks, query terms, other) • (Ab)use of a search engine - but not as a search engine for content - more like a search engine for behavior • See Ted Dunning‘s talk from Berlin Buzzwords on Multi- modal Recommendation Algorithms - http://berlinbuzzwords.com/sessions/multi-modal-recommendation- algorithms • Go get Mahout/Myrrix or just do it in y(our) search engine

21. © 2013 LucidWorks 21 … Time travel? • Leverage Solr‘s new spatial capabilities to index non-spatial data, such as time ranges - Useful for Open Hours, Shifts, etc. • Query using rectangle intersections - q = shift:"Intersects(0 19 23 365)‖ https://people.apache.org/~hossman/spatial-for-non-spatial-meetup-20130117/

23. © 2013 LucidWorks • Lucene/Solr EU Conference: - Dublin, IE, November 4-7: http://lucenerevolution.org/ - CFP Open Now Where to Next? • Lucene/Solr - http://lucene.apache.org - {java-user|solr-user}@lucene.apache.org - SIGIR ‗12 Open Source Workshop » http://opensearchlab.otago.ac.nz/paper_ 10.pdf • LucidWorks - http://www.lucidworks.com - Commercial support, products, etc. for Lucene/Solr • Me - grant@lucidworks.com - @gsingers on Twitter - ―Taming Text‖ – Engineer‘s guide to open source search and NLP » http:///www.manning.com/ingersoll 23

24. © 2013 LucidWorks 24 Credits • All of the Lucene/Solr committers and contributors • Polar bear: http://gaijinexplorer.blogspot.ie/2012/12/its-all-just-relaxing.html • Volunteers: http://www.poconohealthsystem.org/?id=228&sid=1 • Not Hiring: http://naijaguardianjobs.com/wp-content/uploads/2013/03/Not-Hiring- The-American.jpg • Keys: http://www.flickr.com/photos/crazyneighborlady/355232758/ • Love: http://www.msruntheus.com/above-all-love-each-other-deeply/ • TARDIS: http://2.bp.blogspot.com/- ysN8JskY4WM/UEZNhBywQKI/AAAAAAAABdg/gXE0A9OO6Mk/s1600/13881_do ctor_who.jpg

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