Cassandra's nodetool repair appears to cause outages

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I have a 4 node Cassandra cluster that didn't see a repair() for about 8 months, in between administrators. It doesn't see much in the way of deletes. I've noticed that when I run nodetool repair, the system will not accept new data, and nobody can connect with cqlsh until the repair is completed. Is it normal for repair to cause downtime?

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