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0cff0ffa08
before this change, alternator_timeout_in_ms is not live-updatable, as after setting executor's default timeout right before creating sharded executor instances, they never get updated with this option anymore. but many users would like to set the driver timers based on server timers. we need to enable them to configure timeout even when the server is still running. in this change, * `alternator_timeout_in_ms` is marked as live-updateable * `executor::_s_default_timeout` is changed to a thread_local variable, so it can be updated by a per-shard updateable_value. and it is now a updateable_value, so its variable name is updated accordingly. this value is set in the ctor of executor, and it is disconnected from the corresponding named_value<> option in the dtor of executor. * alternator_timeout_in_ms is passed to the constructor of executor via sharded_parameter, so `executor::_timeout_in_ms` can be initialized on per-shard basis * `executor::set_default_timeout()` is dropped, as we already pass the option to executor in its ctor. Fixes #12232 Closes #13300 * github.com:scylladb/scylladb: alternator: split the param list of executor ctor into multi lines alternator,config: make alternator_timeout_in_ms live-updateable