HDFS-11530 has made it configurable to use DFSNetworkTopology, and still uses NetworkTopology as default.
Given the stress testing in HDFS-11923 which shows the correctness of DFSNetworkTopology, and the performance testing in
HDFS-11535 which shows how DFSNetworkTopology can outperform NetworkTopology. I think we are at the point where I can and should enable DFSNetworkTopology as default.
Any comments/thoughts are more than welcome!