1. Automated Introspection of a
Distributed Virtualization
Platforms for Performance
Analysis and Documentation
Nima Kaviani, Michael Miximilien,
Ignacio Silva-Lepe, Isabelle Rouvellou
IBM Research – T.J. Watson Research Centre
University of British Columbia, Vancouver, Canada

3. Problem
Understanding Distributed
Open-source Cloud Platforms

4. Problem

5. Problem
Track System Evolution

6. Problem
Austin Bexar Cactus Diablo
Essex
Folsom
Grizzly
Havana

7. Problem
Austin Bexar Cactus Diablo
Essex
Folsom
Grizzly
Havana
version 1.0
version 2.0

8. Problem
Austin Bexar Cactus Diablo
Essex
Folsom
Grizzly
Havana
version 1.0
version 2.0
Online Enterprise

9. Problem
Software Resiliency & Testing

11. 11
CloudFoundry 1.0
CF Client Eclipse Plugin MobilePC
Router
NATS
Mysql Redis Mongo
.....
.
NATS MSGHTTP MSG
DEA
UAA
Health
Manager
Stager
Cloud
Controller
Cloud
Controller
Service Pool
Cache
BlobStore

12. 12
CloudFoundry 2.0
CF Client Eclipse Plugin MobilePC
GoRouter
NATS
Mysql Redis Mongo
.....
.
NATS MSGHTTP MSG
DEA
UAA
Health
Manager
Cloud
Controller
Cloud
Controller
Service Pool
Cache
BlobStore
Connector
Ext. Services
Apps in warden
Build Packs Dir Server

13. Code Introspection
capturing message exchanges

14. Code Introspection
capturing message exchanges
Aquarium:
Aspect-oriented programming for
Ruby
point-cuts advicejoin-points

15. 15
Aquarium
class Test
def test_method
puts “Hello World!”
end
end

16. 16
Aquarium
class Test
def test_method
puts “Hello World!”
end
end
join-points

17. 17
Aquarium
class Test
def test_method
puts “Hello World!”
end
end
Aspect.new :around, :calls_to => “test_method”,
:type_and_descendents => “Test”,
:method_options[:public] do |jpt, obj, *args|
puts “Pre-Aspect Execution.”
result = jpt.proceed
puts “Post-Aspect Execution.”
end
join-points

18. 18
Aquarium
class Test
def test_method
puts “Hello World!”
end
end
Aspect.new :around, :calls_to => “test_method”,
:type_and_descendents => “Test”,
:method_options[:public] do |jpt, obj, *args|
puts “Pre-Aspect Execution.”
result = jpt.proceed
puts “Post-Aspect Execution.”
end
join-points
point-cuts

19. 19
Aquarium
class Test
def test_method
puts “Hello World!”
end
end
Aspect.new :around, :calls_to => “test_method”,
:type_and_descendents => “Test”,
:method_options[:public] do |jpt, obj, *args|
puts “Pre-Aspect Execution.”
result = jpt.proceed
puts “Post-Aspect Execution.”
end
join-points
point-cuts
advice

20. 20
Aquarium
class Test
def test_method
puts “Hello World!”
end
alias_method :_aspect_saved_Test_test_method,
:test_method
def test_method *args, &block_for_method
# advice chaining
# advice invocation
end
public :test_method
private :_aspect_saved_Test_test_method
end

21. 21
Aquarium
class Test
def test_method
puts “Hello World!”
end
alias_method :_aspect_saved_Test_test_method,
:test_method
def test_method *args, &block_for_method
# advice chaining
# advice invocation
end
public :test_method
private :_aspect_saved_Test_test_method
end
rewrite

22. 22
Aquarium
class Test
def _aspect_saved_Test_test_method
puts “Hello World!”
end
def test_method *args, &block_for_method
# advice chaining
# advice invocation
# making a call to :_aspect_saved_Test_test_method
end
public :test_method
private :_aspect_saved_Test_test_method
end

23. Code Inspection
AOP - drawback

24. Code Inspection
AOP - drawback
Aspect.new :around, :calls_to => “test_method”,
:type_and_descendents => “Test”,
:method_options[:public] do |jpt, obj, *args|
puts “Pre-Aspect Execution.”
result = jpt.proceed
puts “Post-Aspect Execution.”
end
Signature
Dependent

25. Capturing NATS

26. Capturing REST
REST Http Client

27. 27
CloudFoundry 2.0
CF Client Eclipse Plugin MobilePC
GoRouter
NATS
Mysql Redis Mongo
.....
.
NATS MSGHTTP MSG
DEA
UAA
Health
Manager
Cloud
Controller
Service Pool
Cache
BlobStore
Connector
Ext. Services
Apps in warden
Build Packs Dir Server
PROFILER
PR
PR
PR PR
PR
PR
PR PR PR
PR

28. 28
CloudFoundry 2.0
CF Client Eclipse Plugin MobilePC
GoRouter
NATS
Mysql Redis Mongo
.....
.
NATS MSGHTTP MSG
DEA
UAA
Health
Manager
Cloud
Controller
Service Pool
Cache
BlobStore
Connector
Ext. Services
Apps in warden
Build Packs Dir Server
PROFILER
PR
PR
PR PR
PR
PR
PR PR PR
PR
Analysis Server

29. 29
Analysis Server
Message
Correlation
Message
Type Resolution
Message
Source Resolution
Message
Target Resolution
Message
Correlation
Message
Correlation
Message
Filtering
Sequence
Exec Extraction
Sequence
Extraction
Sequence
Diagram Docs
Message
Templates
Message
Pattern Changes

30. Documentation Generation
Message Exchange Patterns

31. 31
Message Exchange Patterns
Channel Name: dea.advertise
Content: Name Type
app_id_to_count Hash
available_memory FixNum
id String
prod FalseClass
stacks Array
Subscribers:
Cloud_Controller
Publishers:
DEA

32. Documentation Generation
Message Exchange Sequences

33. 33
Message Exchange Sequences
Message Snapshots:

34. 34
Message Exchange Sequences
Message Snapshots:

35. System Evolution
Message Pattern Changes

36. 36
Message Pattern Changes
Channel Name: dea.advertise
Content: Name Type
app_id_to_count Hash
available_memory FixNum
id String
prod NilClass FalseClass
runtimes stacks Array
Subscribers:
Cloud_Controller
Publishers:
DEA

37. Evaluations

38. Evaluations
releasing the documentation
to the CloudFoundry community

39. 39
Evaluation
5 days of active emailing / twitting people
11 people responded

40. 40
Evaluation

41. 41
Evaluation

42. 42
Evaluation

43. 43
Evaluation

44. 44
Evaluation

45. Challenges

46. Challenges
signature-based AOP is restrictive

47. Challenges
manual intervention is required

48. Future Plans

49. Future Plans
developing a DSL for instrumentation

50. Future Plans
assessing generalizability

51. Future Plans
software resiliency tests

52. Future Plans
increased automation

53. Future Plans
code dependency analysis

54. Contact
Nima Kaviani
nkaviani@cs.ubc.ca
@nimak