Programmer Slang, Part 2: More Terms

 

Programmer Slang, Part 2: More Terms

State & Tracking

Term	Meaning
dirty bit	A flag indicating that data has been modified
cache invalidation	Making cached data unusable because the underlying data changed
source of truth / SSOT	The authoritative place where the correct state lives
eventual consistency	Copies of data may temporarily disagree but eventually converge
state drift	Two supposedly synchronized states gradually become different
state explosion	The number of possible states becomes difficult to manage
ghost state	State that exists unexpectedly or is difficult to account for
shadow state	A secondary copy of state maintained alongside the main state
derived state	State calculated from other state rather than stored independently

Debugging & Investigation

Term	Meaning
ghost bug	A bug that seems to mysteriously disappear
printf debugging	Debugging primarily by inserting print/log statements
shotgun debugging	Changing many things at once and hoping something fixes the problem
whack-a-mole	Fixing one problem only for another one to appear

Code Quality & Architecture

Term	Meaning
big ball of mud	A system whose architecture has become highly tangled
dead code	Code that is no longer executed or needed
code smell	A pattern suggesting a deeper design problem
technical debt	Short-term implementation choices that create future cost
leaky abstraction	An abstraction whose underlying implementation details become visible
shotgun surgery	One small change requiring modifications scattered throughout the codebase
feature creep	A project gradually accumulating more features than originally intended

Performance

Term	Meaning
cold path	Code executed rarely
memory pressure	A system approaching or exceeding comfortable memory availability
cache miss	Requested data isn't found in the expected cache
cache stampede	Many requests simultaneously regenerate the same missing cached data
premature optimization	Optimizing before there is evidence that optimization is needed
death by a thousand cuts	Many small inefficiencies collectively causing a major problem

Concurrency & Distributed Systems

Term	Meaning
network partition	Nodes become unable to communicate reliably
circuit breaker	Temporarily stops calls to a failing service
bulkhead	Isolates failures so one subsystem doesn't bring down everything else

Team & Process

Term	Meaning
rubber stamp	Approving something without meaningful review
scope creep	Requirements gradually expanding beyond the original agreement
yak stack	A whole chain of prerequisite problems encountered while trying to accomplish one task