Cassandra: Is it normal to have so many gc.log processes

I am quite new to cassandra, so if someone can explain me what I see here. I have a cassandra ring with 16 nodes(simple strategy) and if I use htop on the nodes I see too many gc.log processes taking place which also I think occupy a lot of memory! 16 of them belong to the 16 nodes, but what about the rest? Is that normal to have so many logging events?

It's not gc.log processes, it's the single Cassandra process that has an option that specifies where to store gc.log file. You see so many because by default htop shows all threads of the process, not single process item (see this answer for explanation). You can check this by executing ps -aef|grep gc.log - you should see only one item for Cassandra process.