App Engine overview (Android meetup 06-10)
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Using App Engine to power your native Android applications Jason Cooper Developer Programs Engineer [email protected]
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Transcript of App Engine overview (Android meetup 06-10)
Using App Engine to power your native Android applications
Jason CooperDeveloper Programs Engineer
What is App Engine?
Spectrum of cloud-based services
Infrastructure as a ServiceIaaS
Spectrum of cloud-based services
Infrastructure as a ServiceIaaS
Software as a ServiceSaaS
Spectrum of cloud-based services
Infrastructure as a ServiceIaaS
Platform as a ServicePaaS
Software as a ServiceSaaS
Spectrum of cloud-based services
Infrastructure as a ServiceIaaS
Platform as a ServicePaaS
Software as a ServiceSaaS
Sandbox restrictions
Applications cannot currently:open a socket or access another host directlyspawn a sub-process or threadmake other system callswrite to the filesystem
Python applications cannot include C extensions or other code that must be compiled.
Java applications cannot use unapproved JRE classes.
APIs and services
Ensuring portability
Components
Runtimes
LocalSDK
AdminConsole
ScalableInfrastructure
Linux, GFS, Bigtable, custom hardware
Python, JVM
Components
LocalSDK
AdminConsole
Google Plugin for Eclipse
Why App Engine?
Setting up a (scalable) app is hard!
Setting up a (scalable) app is hard!
Initial setupserversnetworkingload balancerssoftware licenses
Maintenancepatchesupgrades
Forecastingtrafficutilization
TIME!MONEY!
"Run your apps on Google's scalable infrastructure"
Easy to use, scale, and manage
Scale dynamically and automatically
User
App Engine
Frontend
App’sRuntime
Scale dynamically and automatically
User
App Engine
Frontend
App’sRuntime
Scale dynamically and automatically
User
App Engine
Frontend
App’sRuntime
User
User
User
User
Scale dynamically and automatically
App’sRuntime
App’sRuntime
User
App Engine
Frontend
App’sRuntime
User
User
User
User
App Engine Front End
App Engine Front End
App Engine Front End
AppServer AppServer AppServer
Load Balancer
Scale dynamically and automatically
Incoming requests
Free quota
Every App Engine application receives the following at no cost:
6.5 CPU hours per day1.0 GB incoming bandwidth per day1.0 GB outgoing bandwidth per day1.0 GB storage (data + indexes)2,000 emails sent per day
Purchase resources as needed
Demo!
Datastore deep dive
Bigtable
Datastore design
DistributedBigtable + entity groupsACID transactionsOptimistic concurrencyEntities + indexesProtobuf encoded entities
Datastore properties
Core value typesstringintegerfloating pointdatetimeboolean
Composite value typesusers.Userdb.Email...
Lists (multi-valued)Text and binary blobsReferences (keys)
Datastore - what's familiar?
IndexesACID transactionsGQL (SQL-like syntax):
db.GqlQuery(''' SELECT * FROM Story WHERE title = 'App Engine Launch' AND rating >= 10 ORDER BY rating, created DESC''')
Datastore - what's different?
No inner, outer, or natural joinsDense index scansPer-entity metadataSoft schema (no DDL!)Queries as object syntax:
q = Story.all()q.filter("title =", 'App Engine Launch')q.filter("rating >=", 10)q.order("-rating")q.order("-created")
Bigtable queries
1. Scan rows2. Pre-generate index tables3. Each index row "points" to entity
Bigtable queries (contd.)
Bigtable queries (contd.)
Bigtable queries (contd.)
Bigtable queries (contd.)
Bigtable queries (contd.)
Bigtable queries (contd.)
Querying geospatial data
Latitudes and longitudes can't be queried separately in ranges. More and more solutions use geohashes or geocells to do geospatial queries. Examples:
GeoModelhttp://code.google.com/p/geomodel/http://code.google.com/p/javageomodelSupports both bounding-box and proximity queries
mutinyhttp://code.google.com/p/mutiny/ Sample: http://mutiny.appspot.com
geodatastorehttp://code.google.com/p/geodatastore/
