цитирую - if for some reason we cant’t or don’t want to have a data bearing node but still be able to failover beetwen nodes we can add a replicaset member as an arbiter . That said, arbiters do cause significant consistency issues in disctibuted data systems. So WE advise you use them with care. In my personal view the usage of arbiters is a very sensitive and potenially harmful option in many deployments. So I idly discourage the usage of arbiters. Avoid arbiters!
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