Essential complexity = plane
Accidental complexity = Indian power lines
V1 user does not like
V2 overly complex
Everything is diffing mental models
Size of team matters adding ppl is counterproductive
Application of knowledge, level of experience
Dreyfus model
Experts create recipes for novices and advanced beginners
Brian Goetz, extending Java with backward comp
1952
Make coding comprehensible
Test reviews more important than code reviews
2.0 - 0.9 = 0.89999999
Have to have humans working on code that understand this
Possible to create obj hierarchy where legal equals is not possible
Must use most powerful language at disposal
Increased flexibility = increased complexity
ESB - complexity does not go away, need to be smart
Internals are not standardized
CAP Availability = caching
"if u can't split it u can't scale it" shoelz eBay
Level 3 = competent
Accidental complexity = Indian power lines
V1 user does not like
V2 overly complex
Everything is diffing mental models
Size of team matters adding ppl is counterproductive
Application of knowledge, level of experience
Dreyfus model
Experts create recipes for novices and advanced beginners
Brian Goetz, extending Java with backward comp
1952
Make coding comprehensible
Test reviews more important than code reviews
2.0 - 0.9 = 0.89999999
Have to have humans working on code that understand this
Possible to create obj hierarchy where legal equals is not possible
Must use most powerful language at disposal
Increased flexibility = increased complexity
ESB - complexity does not go away, need to be smart
Internals are not standardized
CAP Availability = caching
"if u can't split it u can't scale it" shoelz eBay
Level 3 = competent
Super observer sees all consistency - not necessary?
What is core business? Can solve with fault tolerant hardware instead of sware complexity?
Context... Hard problem
Google talk hardest problem is social graph (friend status)
IO throughput, CPU throughput, two solutions
Request, asynchronous mq, response
Don't cache preemptively
What is core business? Can solve with fault tolerant hardware instead of sware complexity?
Context... Hard problem
Google talk hardest problem is social graph (friend status)
IO throughput, CPU throughput, two solutions
Request, asynchronous mq, response
Don't cache preemptively
Sharing 3x3 is magic
3 shards, replicate sets
3 shards, replicate sets
Blaze.io/testing
Preattentive 200ms
Stevens power law ppl find length easier to perceive than area - pie charts are harder to understand
Show the data - don't accentuate, "lie factor"
Max ideas presented min time, min ink, min space
"Chart junk"
Spark lines, word-size graphics, eg glucose level inline with text
Jquery sparkling
Rgraph
Highcharts commercial eg Gatling
Raphael
D3 data drives with little code, based on protovis
- multivariate relationships
- parallel coordinates 100g
Tangle worrydream, Bret Victor
- interactive document
exhibit, simile-widgets
Flowingdata.com "visualize this" book
Many eyes IBM
Selection.datavisualization.ch
inmaps.linkedinlabs.com
Stevens power law ppl find length easier to perceive than area - pie charts are harder to understand
Show the data - don't accentuate, "lie factor"
Max ideas presented min time, min ink, min space
"Chart junk"
Spark lines, word-size graphics, eg glucose level inline with text
Jquery sparkling
Rgraph
Highcharts commercial eg Gatling
Raphael
D3 data drives with little code, based on protovis
- multivariate relationships
- parallel coordinates 100g
Tangle worrydream, Bret Victor
- interactive document
exhibit, simile-widgets
Flowingdata.com "visualize this" book
Many eyes IBM
Selection.datavisualization.ch
inmaps.linkedinlabs.com
Watch Rich Hickey videos
Dynamic
Strongly typed
Functional
High-performance
Lisp
Homoiconic
Only references are mutable
Regex #""
Symbols
Keywords special symbols :foo ::foo, constant intern strings
Data literals
-List. Singly linked insert at front ()
-Vector. Indexed, insert at rear []
-Map key/value {:}
-Set #{}
Few data structures many functions
Seq interface
Dynamic
Strongly typed
Functional
High-performance
Lisp
Homoiconic
Only references are mutable
Regex #""
Symbols
Keywords special symbols :foo ::foo, constant intern strings
Data literals
-List. Singly linked insert at front ()
-Vector. Indexed, insert at rear []
-Map key/value {:}
-Set #{}
Few data structures many functions
Seq interface
