Hello, I noticed that StreamCoordinator.ConnectionsPerHost is always set to 1 (Cassandra 2.1.13). If I am reading the code correctly, this means there will always be just one socket (well, 2 technically for each direction) between nodes when rebuilding thus the data will always be serialized.
Have folks experimented with increasing this ? It appears that some parallelism here might help rebuilds in a significant way assuming we aren't hitting bandwidth caps (it's a pain for us at the moment to rebuild nodes holding 500GB). I'm going to try to patch our cluster with a change to test this out, but wanted to hear from experts as well. Thanks !
