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6b0afb968d
Allowing to change the total or initial resources the semaphore has. After calling `set_resources()` the semaphore will look like as if it was created with the specified amount of resources when created. Use the new method in `replica::database::revert_initial_system_read_concurrency_boost()` so it doesn't lead to strange semaphore diagnostics output. Currently the system semaphore has 90/100 count units when there are no reads against it, which has led to some confusion. I also plan on using the new facility in enterprise. Closes #11772 * github.com:scylladb/scylladb: replica/database: revert initial boost to system semaphore with set_resources() reader_concurrency_semaphore: add set_resources()