/** {@inheritDoc} */
  @SuppressWarnings({"unchecked"})
  @Override
  public GridFuture<?> reloadAllAsync() {
    GridCompoundFuture fut = new GridCompoundFuture(ctx.kernalContext());

    fut.add(super.reloadAllAsync());
    fut.add(dht.reloadAllAsync());

    fut.markInitialized();

    return fut;
  }
  /** {@inheritDoc} */
  @SuppressWarnings({"unchecked"})
  @Override
  public GridFuture<?> reloadAllAsync(
      @Nullable GridPredicate<? super GridCacheEntry<K, V>>[] filter) {
    GridCompoundFuture fut = new GridCompoundFuture(ctx.kernalContext());

    fut.add(super.reloadAllAsync());
    fut.add(dht.reloadAllAsync(filter));

    fut.markInitialized();

    return fut;
  }
    /**
     * @return Future if any submitted.
     * @throws GridInterruptedException If thread has been interrupted.
     */
    @Nullable
    GridFuture<?> flush() throws GridInterruptedException {
      List<Map.Entry<K, V>> entries0 = null;
      GridFutureAdapter<Object> curFut0 = null;

      synchronized (this) {
        if (!entries.isEmpty()) {
          entries0 = entries;
          curFut0 = curFut;

          entries = newEntries();
          curFut = new GridFutureAdapter<>(ctx);
          curFut.listenAsync(signalC);
        }
      }

      if (entries0 != null) submit(entries0, curFut0);

      // Create compound future for this flush.
      GridCompoundFuture<Object, Object> res = null;

      for (GridFuture<Object> f : locFuts) {
        if (res == null) res = new GridCompoundFuture<>(ctx);

        res.add(f);
      }

      for (GridFuture<Object> f : reqs.values()) {
        if (res == null) res = new GridCompoundFuture<>(ctx);

        res.add(f);
      }

      if (res != null) res.markInitialized();

      return res;
    }
  /**
   * Remove particular entry from the trash directory or subdirectory.
   *
   * @param parentId Parent ID.
   * @param id Entry id.
   * @throws IgniteCheckedException If delete failed for some reason.
   */
  private void deleteDirectory(IgniteUuid parentId, IgniteUuid id) throws IgniteCheckedException {
    assert parentId != null;
    assert id != null;

    while (true) {
      IgfsFileInfo info = meta.info(id);

      if (info != null) {
        assert info.isDirectory();

        Map<String, IgfsListingEntry> listing = info.listing();

        if (listing.isEmpty()) return; // Directory is empty.

        Map<String, IgfsListingEntry> delListing;

        if (listing.size() <= MAX_DELETE_BATCH) delListing = listing;
        else {
          delListing = new HashMap<>(MAX_DELETE_BATCH, 1.0f);

          int i = 0;

          for (Map.Entry<String, IgfsListingEntry> entry : listing.entrySet()) {
            delListing.put(entry.getKey(), entry.getValue());

            if (++i == MAX_DELETE_BATCH) break;
          }
        }

        GridCompoundFuture<Object, ?> fut = new GridCompoundFuture<>();

        // Delegate to child folders.
        for (IgfsListingEntry entry : delListing.values()) {
          if (!cancelled) {
            if (entry.isDirectory()) deleteDirectory(id, entry.fileId());
            else {
              IgfsFileInfo fileInfo = meta.info(entry.fileId());

              if (fileInfo != null) {
                assert fileInfo.isFile();

                fut.add(data.delete(fileInfo));
              }
            }
          } else return;
        }

        fut.markInitialized();

        // Wait for data cache to delete values before clearing meta cache.
        try {
          fut.get();
        } catch (IgniteFutureCancelledCheckedException ignore) {
          // This future can be cancelled only due to IGFS shutdown.
          cancelled = true;

          return;
        }

        // Actual delete of folder content.
        Collection<IgniteUuid> delIds = meta.delete(id, delListing);

        if (delListing == listing && delListing.size() == delIds.size())
          break; // All entries were deleted.
      } else break; // Entry was deleted concurrently.
    }
  }