@Override
  public void setMessageSyncInterval(int seconds) {
    throwIfClient();
    stopper.checkCancelInProgress(null);
    if (seconds < 0) {
      throw new IllegalArgumentException(
          "The 'messageSyncInterval' property for cache cannot be negative");
    }
    HARegionQueue.setMessageSyncInterval(seconds);
  }
Return true if the region is initializing.
geode-core/src/main/java/org/apache/geode/internal/cache/GemFireCacheImpl.java