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961a53f716
before this change, we specify the KillMode of the scylla-service service unit explicitly to "process". according to according to https://www.freedesktop.org/software/systemd/man/latest/systemd.kill.html, > If set to process, only the main process itself is killed (not recommended!). and the document suggests use "control-group" over "process". but scylla server is not a multi-process server, it is a multi-threaded server. so it should not make any difference even if we switch to the recommended "control-group". in the light that we've been seeing "defunct" scylla process after stopping the scylla service using systemd. we are wondering if we should try to change the `KillMode` to "control-group", which is the default value of this setting. in this change, we just drop the setting so that the systemd stops the service by stopping all processes in the control group of this unit are stopped. Refs scylladb/scylladb#21507 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#21508