“Careful. “Legacy” isn’t a bad word. “Legacy” usually means tried, true, and of enough value that it lasted long enough to be old and outdated. To mock “Legacy” is to look at the successes of the past and to declare that they aren’t to be revered or respected. Most of what runs our economies is “Legacy”. In the future, I hope that the software I’m creating now was highly regarded enough that it’s still around and
”
being referred to as “Legacy”.
it wasn’t :(
How do you create systems that survive?
Step 1: Has to be born
http://tinyurl.com/codealive
UR SOFTWARE IS ALIVE!!!!!
It all comes back to one thing: code survives by providing value and by being difficult to replace.
Value > Difficulty
The primordial soup is chunky with SQL, ant scripts, and old servlet carcasses. Time goes on, and complexity builds.
http://tinyurl.com/ulsgabriel
richard p. gabriel DesignI Beyond Human Abilities In this presentation talk about trillions of lines of code in order to emphasize a scale way beyond what we
think of as remotely feasible today. This is an exaggeration because Grady Booch has estimated that collectively, humankind has produced a total of about a trillion lines of code since programming as we know it began in
1945
http://tinyurl.com/ulsgabriel
richard p. gabriel Design Beyond Human Abilities Biological
systems are very much larger than anything (coherent)
that people have built.
How do we create systems that outlast us?
homeostasis
brain liver
kidney Metabolize
toxic
substances Blood water level,
re-absorption of substances into blood,
excretion
“An inability to maintain homeostasis may lead to death or a disease, a condition known as homeostatic imbalance.”
You are dying right now! 50 trillion cells in your body
3 million die per second * this is a guess
emacs “UNIX” BSD C-language toolchain grep Apache X-Windows System make
Kill and replace cells regularly forces you to work with small components
“When a cell is not healthy, an outside
cell that’s part of the immune system can command the cell to destroy itself without spreading toxins.”
Nodes are Disposable
Immutable Deployments
Never Upgrade Software on an Existing Node
D
Deploying
Simple Interfaces UNIX pipes
Bull RPC
Heterogenous By Default
Assume Failure
MTBF vs MTTR
Monitor Everything !
Favor measurement over testing
Experience the Worst Case Scenario so You Don’t Have to Fear It !
Homeostasis
Services own and encapsulate data
tiny data
hardware limitations
sorry :( i don’t know how to do it
E R O
O N
M
"By believing passionately in something that does not yet exist, we create it. The nonexistent is whatever we have not sufficiently desired." - Nikos Kazantzakis
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