docs: public void sendPoisonPill(Collection<Integer> hostIds, String err, int cause) {
          for (int hostId : hostIds) {
              Iterator<ForeignHost> it = m_foreignHosts.get(hostId).iterator();
              // No need to overdose the poison pill
              if (it.hasNext()) {
                  ForeignHost fh = it.next();
                  if (fh.isUp()) {
                      fh.sendPoisonPill(err, cause);
                  }
              }
          }
      }