public void checkCancelInProgress(Throwable e) {
      String reason = cancelInProgress();
      if (reason == null) {
        return;
      }
      throw generateCancelledException(e);
    }
Start services - this will start everything up and join the cluster.
Invoke init() before this method.
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/Services.java