private <K, V> Map<K, V> getRegionData(String regionName) {
    final Region<K, V> region = cache.getRegion(SEPARATOR + regionName);
    Map<K, V> map = new HashMap<>();
    for (K key : region.keySet()) {
      map.put(key, region.get(key));
    }
    return map;
  }
To be used only for ParallelGatewaySender.

@param senderId Id of the ParallelGatewaySender
geode-wan/src/distributedTest/java/org/apache/geode/internal/cache/wan/WANTestBase.java