Set<String> getGroups(String groupString) {
    if (StringUtils.isBlank(groupString)) {
      return new HashSet<>();
    }

    return (Arrays.stream(groupString.split(",")).collect(Collectors.toSet()));
  }
Request the shared configuration for group(s) from locator(s) this member is bootstrapped with.

This will request the group config this server belongs plus the "cluster" config

@return {@link ConfigurationResponse}
geode-core/src/main/java/org/apache/geode/internal/cache/ClusterConfigurationLoader.java