@Override
  public InternalRegion getReinitializingRegion(String fullPath) {
    Future<InternalRegion> future = reinitializingRegions.get(fullPath);
    if (future == null) {
      return null;
    }
    try {
      InternalRegion region = future.get();
      region.waitOnInitialization();
      if (logger.isDebugEnabled()) {
        logger.debug("Returning manifested future for: {}", fullPath);
      }
      return region;
    } catch (InterruptedException ignore) {
      Thread.currentThread().interrupt();
      return null;
    } catch (ExecutionException e) {
      throw new Error("unexpected exception", e);
    } catch (CancellationException ignore) {
      // future was cancelled
      logger.debug("future cancelled, returning null");
      return null;
    }
  }
Return true if the region is initializing.
geode-core/src/main/java/org/apache/geode/internal/cache/GemFireCacheImpl.java