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The configuration mechanism used by the Ace process launcher is not very suitable if you want to be sure that a process is launched only once. You have no full control over the process being launched, as there is the config admin in between.
To fix the issue a locking mechamism (creating .lock files) should be added to the cassandra manager. The process launcher should be overruled (embed and extend) to invoke the startProcess and stopProcess with the configuration directly, without the config admin in between. This provides the required control to the cassandra manager.