This function adds a callback to every task that will read messages from a redis list and write them to your R console. Useful to pipe notifications from other processes and stay in the zone.
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Set the following parameters: rediska.channel - the name of the list to which other processes should lpush. rediska.msg_threshold - maximum number of messages to be shown. If there are more messages a warning will be shown. rediska.exitthezone - name of the variable through which one can signal rediska to exit the zone.
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