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69c21f490a
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. 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. please note, in the ctor of executor, we always update the cached value of `s_default_timeout` with the value of `_timeout_in_ms`, and we set the default timeout to 10s in `alternator_test_env`. this is a design decision to avoid bending the production code for testing, as in production, we always set the timeout with the value specified either by the default value of yaml conf file. Fixes #12232 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>