Being RDBMS Free -- Alternate Approaches to Data Persistence
Thinking Beyond RDBMS : Building Polyglot Persistence ... Beyond RDBMS : Building Polyglot...
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OPENSHIFT Workshop PRESENTED BY Shekhar Gulati Thinking Beyond RDBMS : Building Polyglot Persistence Java Applications
Transcript of Thinking Beyond RDBMS : Building Polyglot Persistence ... Beyond RDBMS : Building Polyglot...
OPENSHIFTWorkshop
PRESENTEDBY
ShekharGulati
Thinking Beyond RDBMS : Building Polyglot Persistence
Java Applications
WHO AM I?
• Shekhar Gulati -- OpenShift Developer Evangelist
• Java / JavaScript /Python / NoSQL / Cloud Guy
• Twitter Handle : shekhargulati
• Github https://github.com/shekhargulati
• Slides http://www.slideshare.net/shekhargulati
AGENDA
WHO ARE YOU?
There are no stupid questions only stupid answers. So ask questions
ASK QUESTIONS
● Widely used and understood
● Tested in real environments
● Efficient use of storage space if data normalized properly
● Great tools support
● ACID semantics
● Incredibly flexible and powerful query language
● Great framework support
WHY RDBMS?
● Complex object graphs does not map very well with flat tables.
● Difficult to evolve Schema with time.
● Data constraints and JOINs can be expensive at runtime.
● Difficult to scale horizontally.
RDBMS LIMITATIONS
NoSQL Databases to rescue
● Schema-less
● Eventual consistent
● Scales writes and reads
● Easy to scale horizontally to add processing power and storage
● Tries to solve few practical use-cases
NoSQL TO RESCUE
NoSQL CLASSIFICATIONNOSQL CLASSIFICATION
Source http://www.slideshare.net/bscofield/nosql-codemash-2010
Using multiple data storage technologies, chosen based upon the way data is being used by individual applications or components of single application.
Martin Fowler
http://martinfowler.com/articles/nosql-intro.pdf
POLYGLOT PERSISTENCE
http://martinfowler.com/articles/nosql-intro.pdf
HYPOTHETICAL EXAMPLE
GET MORE INFO AT
● MongoDB – Storing Jobs data
● PostgreSQL – Storing Users data
● Redis – Cache for Users
● Java 7
– Spring framework , Spring Social, Spring MongoDB, Spring Security , Spring Redis , etc.
● OpenShift
● Git
● Twitter Bootstrap
● jQuery
● Searchify : Full-text Search as a Service
TECHNOLOGY CHOICES
● Document Oriented database
– JSON-style documents
● Schema-less
– Each document is heterogeneous, and may have completely unique structure compared to other documents.
● Fast and horizontally scalable
● Rich query language
MONGODB
Database → Database
Table → Collection
Row → Document
Index → Index
MONGODB TERMINOLOGYMONGODB TERMINOLOGY
● Easy to get running
● Open Source
● Active community
● Rich documents
● Geospatial indexing
● Writes are very fast. You can customize it using WriteConcern
WHY MONGODB?
RICH DOCUMENT
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What is it for? Find all the MongoDB jobs near me – Proximity Queries Find all the MongoDB jobs within Colombo – Bounded
Queries Find all the MongoDB job at this location – Exact Queries
● Supports only two dimensional indexes. You can only have one geospatial index per collection. By default, 2d geospatial indexes assume longitude
and latitude have boundaries of -180 inclusive and 180 non-inclusive (i.e. [-180, 180))
GEOSPATIAL INDEXING BASICS
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1) Put your coordinates into an array
{ loc : [ 50 , 30 ] } //SUGGESTED OPTION
{ loc : { x : 50 , y : 30 } }
{ loc : { foo : 50 , y : 30 } }
1) { loc : { lon : 40.739037, lat: 73.992964 } }
2) Make a 2d index
db.places.ensureIndex( { loc : "2d" } )
3) If you use latitude and longitude as your coordinate system, always store longitude first. MongoDB’s 2d spherical index operators only recognize [ longitude, latitude] ordering.
HOW TO MAKE IT WORK
OpenShiftis
PaaS by Red Hat
Multi-language,Auto-Scaling,Self-service,
Elastic,Cloud Application
Platform
● Supports MongoDB , PostgreSQL ,and MySQL
● Multi-language support. Supports Java, Node.js, Perl, Python, PHP and Ruby
● Extensible via DIY and cartridges
● No need to learn anything new
● Open source – OpenShift Origin
● Scalable
● FREE!
WHY OPENSHIFT?
origin
Public Cloud Service
On-premise or Private Cloud Software
Open Source Project
FLAVORS OF OPENSHIFT
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OUR STACK
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Let's build the application
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OPENSHIFT – GETTING STARTED
●Go tohttps://openshift.redhat.com/app/account/new
Promo code is LINUXCON2013●Create namespace●Install rhc command line
utility●Run rhc setup command
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$ rhc create-app localjobs jbosseap mongodb-2.2 postgresql-9.2 -s
$ rhc add-cartridge http://cartreflect-claytondev.rhcloud.com/reflect?github=smarterclayton/openshift-redis-cart --app localjobs
$ rhc env set SPRING_PROFILES_ACTIVE=openshift
Lot of other tasks you can do with rhc – tail log, app management, cartridge management , ssh management , namespace management, etc. Run rhc -h for details
DEMO : LOCALJOBS APP
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$ git rm -rf src pom.xml
$ git commit -am “delete template app”
$ git remote add upstream -m master https://github.com/shekhargulati/localjobs-demo.git
$ git pull -s recursive -X theirs upstream master
ITS All GIT
Source code https://github.com/shekhargulati/localjobs-demo
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git push
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Code Walkthrough
QUESTIONS?
DONE!
