towards an architectural style for multi-tenant software applications
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Towards an
Architectural StyleforMulti-tenant
Software Systems
Industrial Software SystemsABB Corporate Research
Dr.-Ing. Heiko Koziolek
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Source: salesforce.com
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28.04.2008: „SAPs neue
Mittelstandssoftware ‚Business By Design‘ klemmt“
25.10.2008:„SAP will sich von
Outsourcing-Tochter trennen“
19.02.2009:„SAP dementiert Verkaufsstopp
für ‚Business by Design‘“
Source: heise.de
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Single-Tenancy Multi-Tenancy
Tenant1 Tenant2 Tenant3
App
Database
OS
Hardware
Tenant1
App
Database
OS
Hardware
Tenant2
App
Database
OS
Hardware
Tenant3
App
Database
OS
Hardware
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Challenges
Technology Focus
Lack ofDocumentation
Ad-hocSolutions
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Architectural Styles
Client /
Server
Pipe-and-
Filter
Peer-to-Peer
Mobile Code
Blackboard
C2
REST
(WWW)
SPIAR (AJAX)
Idea: Multi-tenancy Style
An architectural style is a coordinated set of architectural constraints that restricts the roles / features of architectural elements and the allowed relationships among those elements within any architecture that conforms to that style.
[Fielding2000]
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Architectural Properties
Maintainability
Elasticity
Customizability
Resource Sharing Architectural
Properties
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SPOSAD Style for Multi-Tenancy
Client Tier Application Tier Data Tier
Browser
Rich Client
Multi-tenant Database
Meta-Data
DataAsynch, Synch
TransferLoad
Bala
ncer Application
Threads
Meta-DataManagerC
ach
e (
op
tion
al)
REST
Customization
REST
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SPOSAD Style for Multi-Tenancy
Client Tier Application Tier Data Tier
Browser
Rich Client
Multi-tenant Database
Meta-Data
DataAsynch, Synch
TransferLoad
Bala
ncer Application
Threads
Meta-DataManagerC
ach
e (
op
tion
al)
REST
Customization
REST
Resource Sharing
Elasticity Maintainability
Customizability
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Private Table LayoutExtension Table LayoutUniversal Table Layout
Multi-tenant Database
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Private Table LayoutExtension Table LayoutUniversal Table Layout
Account27
AID Name Robot
Speed
1 ABC X 20
2 DEF Y 50
Account46
AID Name Lines
1 JKM 12
Account33
AID Name
1 GHI
Multi-tenant Database
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Private Table LayoutExtension Table LayoutUniversal Table Layout
Account-Extension
Tenant ID Row AID Name
27 0 1 ABC
27 1 2 DEF
33 0 1 GHI
46 0 1 JKM
Industrial-Account
Tenant ID
Row Robot Speed
27 0 X 20
27 1 Y 50
Telecommunication-Account
Tenant ID
Row Lines
46 0 12
Multi-tenant Database
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Private Table LayoutExtension Table LayoutUniversal Table Layout
Universal
Tenant ID
Table Col1 Col2 Col3 Col4 Col5 Col6
27 0 1 ABC X 20 - -
27 0 2 DEF Y 50 - -
33 1 1 GHI - - - -
46 2 1 JKM 12 - - -
Multi-tenant Database
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Architectural Properties
Single Code Base
Stateless Application Tier
STATE
Shared Data Resources
Customization Component
Architectural
Constraints
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Architectural Trade-offs
Complexity vs. Time to market
Resource Sharingvs. Security / Availability
Customizabilityvs. Maintainability
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Evaluation?
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Client Tier Application Tier Data Tier
Browser
Rich Client
Multi-tenant Database
Meta-Data
DataAsynch, Synch
TransferLoad
Bala
ncer Application
Threads
Meta-DataManagerC
ach
e (
op
tion
al)
REST
Customization
REST
Virtual Application Components
Customized Oracle RAC
Runtime EngineUniversal Table
Layout
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Client Tier Application Tier Data Tier
Browser
Rich Client
Multi-tenant Database
Meta-Data
DataAsynch, Synch
TransferLoad
Bala
ncer Application
Threads
Meta-DataManagerC
ach
e (
op
tion
al)
REST
Customization
REST
Web / WorkerRoles
Blobs, Tables, SQL Azure
Worker Role
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Client Tier Application Tier Data Tier
Browser
Rich Client
Multi-tenant Database
Meta-Data
DataAsynch, Synch
TransferLoad
Bala
ncer Application
Threads
Meta-DataManagerC
ach
e (
op
tion
al)
REST
Customization
REST
JSP / Servlet,Python
Google Big Table
App Engine Services
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27.01.2010
„Mit dem Featurepack 2.5, das Mitte dieses Jahres erscheint,
bekommt Business ByDesign eine Multi-Tenant-Architektur“
Peter Lorenz Leiter SME Solutions SAP
Source: isreport.de
…and SAP? ?
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Conclusions
Multi-tenancy as an Architectural Style
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