private Future<?> executeDiskStoreTask(DiskStoreTask r, ExecutorService executor) {
    try {
      return executor.submit(r);
    } catch (RejectedExecutionException ex) {
      if (logger.isDebugEnabled()) {
        logger.debug("Ignored compact schedule during shutdown", ex);
      }
    }
    return null;
  }
Wait for any current operations in the delayed write pool. Completion of this method ensures
that the writes have completed or the pool was shutdown
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreImpl.java