question: private static boolean isReachable ( String addr , int openPort , int timeOutMillis ) { try { try ( Socket soc = new Socket ( ) ) { soc . connect ( new InetSocketAddress ( addr , openPort ) , timeOutMillis ) ; } return true ; } catch ( IOException ex ) { LOGGER . warn ( "socket connection failed:  " , ex ) ; return false ; } }
target:  check if remote master is reachable