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" Additional extension points. * Allows wrapping commitlog file io (including hinted handoff). * Allows system schema modification on boot, allowing extensions to inject extensions into hardcoded schemas. Note: to make commitlog file extensions work, we need to both enforce we can be notified on segment delete, and thus need to fix the old issue of hard ::unlink call in segment destructor. Segment delete is therefore moved to a batch routine, run at intervals/flush. Replay segments and hints are also deleted via the commitlog object, ensuring an extension is notified (metadata). Configurable listeneres are now allowed to inject configuration object into the main config. I.e. a local object can, either by becoming a "configurable" or manually, add references to self-describing values that will be parsed from the scylla.yaml file, effectively extending it. All these wonderful abstractions courtesy of encryption of course. But super generalized! " * 'calle/commitlog_ext' of github.com:scylladb/seastar-dev: db::extensions: Allow extensions to modify (system) schemas db::commitlog: Add commitlog/hints file io extension db::commitlog: Do segment delete async + force replay delete go via CL main/init: Change configurable callbacks and calls to allow adding opts util::config_file: Add "add" config item overload