Figure 1a shows how incidents happened substantially less on Saturday
and Sunday even though traffic to the site remains consistent throughout
the week. Figure 1b shows a six-month period during which there were only
two weeks with no incidents: the week of Christmas and the week when
employees are expected to write peer reviews for each other.
These two data points seem to suggest that when Facebook employees are
not actively making changes to infrastructure because they are busy with
other things (weekends, holidays, or even performance reviews), the site
experiences higher levels of reliability.
Via Lobsters, Graham King » Facebook’s code quality problem
I guess Facebook's old motto of “move fast and break
things” was probably not the best motto a company could have.
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