public void addToBlacklist(HostAddress hostAddress){
  if (hostAddress != null && !isExplicitClosed()) {
    blacklist.putIfAbsent(hostAddress,System.nanoTime());
  }
}

public void addToBlacklist ( HostAddress hostAddress ) { if ( hostAddress != null && ! isExplicitClosed ( ) ) { blacklist . putIfAbsent ( hostAddress , System . nanoTime ( ) ) ; } }
after a failover , put the hostaddress in a static list so the other connection will not take this host in account for a time .
