Index: clangd/ClangdLSPServer.h
===================================================================
--- clangd/ClangdLSPServer.h
+++ clangd/ClangdLSPServer.h
@@ -113,8 +113,6 @@
     static CompilationDB
     makeDirectoryBased(llvm::Optional<Path> CompileCommandsDir);
 
-    void invalidate(PathRef File);
-
     /// Sets the compilation command for a particular file.
     /// Only valid for in-memory CDB, no-op and error log on DirectoryBasedCDB.
     ///
Index: clangd/ClangdLSPServer.cpp
===================================================================
--- clangd/ClangdLSPServer.cpp
+++ clangd/ClangdLSPServer.cpp
@@ -393,7 +393,6 @@
     // fail rather than giving wrong results.
     DraftMgr.removeDraft(File);
     Server->removeDocument(File);
-    CDB->invalidate(File);
     elog("Failed to update {0}: {1}", File, Contents.takeError());
     return;
   }
@@ -489,7 +488,6 @@
   PathRef File = Params.textDocument.uri.file();
   DraftMgr.removeDraft(File);
   Server->removeDocument(File);
-  CDB->invalidate(File);
 }
 
 void ClangdLSPServer::onDocumentOnTypeFormatting(
@@ -804,11 +802,6 @@
                        /*IsDirectoryBased=*/true);
 }
 
-void ClangdLSPServer::CompilationDB::invalidate(PathRef File) {
-  if (!IsDirectoryBased)
-    static_cast<InMemoryCompilationDb *>(CDB.get())->invalidate(File);
-}
-
 bool ClangdLSPServer::CompilationDB::setCompilationCommandForFile(
     PathRef File, tooling::CompileCommand CompilationCommand) {
   if (IsDirectoryBased) {
Index: clangd/GlobalCompilationDatabase.h
===================================================================
--- clangd/GlobalCompilationDatabase.h
+++ clangd/GlobalCompilationDatabase.h
@@ -100,10 +100,6 @@
   bool setCompilationCommandForFile(PathRef File,
                                     tooling::CompileCommand CompilationCommand);
 
-  /// Removes the compilation command for \p File if it's present in the
-  /// mapping.
-  void invalidate(PathRef File);
-
 private:
   mutable std::mutex Mutex;
   llvm::StringMap<tooling::CompileCommand> Commands; /* GUARDED_BY(Mut) */
Index: clangd/GlobalCompilationDatabase.cpp
===================================================================
--- clangd/GlobalCompilationDatabase.cpp
+++ clangd/GlobalCompilationDatabase.cpp
@@ -135,10 +135,5 @@
   return false;
 }
 
-void InMemoryCompilationDb::invalidate(PathRef File) {
-  std::unique_lock<std::mutex> Lock(Mutex);
-  Commands.erase(File);
-}
-
 } // namespace clangd
 } // namespace clang