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Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/15366 ## Summary RocksDB's `.clang-tidy` enables `modernize-use-override`, and clang reports `-Winconsistent-missing-destructor-override` when a class marks its other overrides `override` but not its destructor. A full scan finds 190 `modernize-use-override`, 100 `inconsistent-missing-destructor-override` and 2 `suggest-override` findings in existing code. Each one comes back whenever a nearby line is edited. They also leave classes where it isn't obvious which methods are overrides and which introduce new virtuals. This diff marks every overriding member function and destructor `override` and drops the redundant `virtual` on them. It also changes `final override` to plain `final`, following the check's default. Methods that introduce a new virtual keep `virtual`. Most edits are clang-tidy's own fix-its, applied mechanically and then clang-formatted. Compatibility: no signatures change. In public headers the only effect is `override` on existing overrides (mostly destructors, plus `Cache::Name()` and `Cache::GetPrintableOptions()`, whose base declarations are unconditional), so user code that subclasses these types is unaffected. Every touched class now marks all of its overrides consistently. This matters because a partially-marked class would make clang emit `-Winconsistent-missing-override` in user builds. Reviewed By: rban1 Differential Revision: D123186308 fbshipit-source-id: 1f489ea32d938e3ec0faf9abc4f7ff49e042d37a