they're common in databases and performance instrumentation of various kinds (as are other forms of data structure "sketch" like count sketches) but not as common outside those realms.
i've gotten interview questions best solved with them a few times; a Microsoft version involved spell-checking in extremely limited memory, and the interviewer told me that they'd actually been used for that back in the PDP era.
i've gotten interview questions best solved with them a few times; a Microsoft version involved spell-checking in extremely limited memory, and the interviewer told me that they'd actually been used for that back in the PDP era.