Drop database did not close any open shard files or close
any topic reader/heartbeats. In the tests, we create and drop new
databases during each test run so these were open files and connection
slowed things down and consumed a lot of RAM as the tests progressed.
This sends data node urls via the broker heartbeat from each data
node. The urls are tracked on the broker to support simpler
cluster setup as well as distributed queries.
Jason Wilder
Philip O'Toole
Ben Johnson