files, _ := filepath.Glob(filepath.Join(diskPath, ".writable-check-*.tmp"))
	for _, file := range files {
		go removeAll(file)
	}

	// Remove the entire folder in case there are leftovers that didn't get cleaned up before restart.
	go removeAll(pathJoin(diskPath, minioMetaTmpBucket+"-old"))

	// Renames and schedules for purging all bucket metacache.
	go renameAllBucketMetacache(diskPath)
}

   * collection's {@code add()} and {@code addAll()} methods throw an {@link
   * IllegalArgumentException}. When methods such as {@code removeAll()} and {@code clear()} are
   * called on the filtered collection, only elements that satisfy the filter will be removed from
   * the underlying collection.
   *

    } catch (RuntimeException tolerated) {
      // GWT's HashMap.keySet().removeAll(null) doesn't throws NPE.
    }
  }

  @Override
  public void testEntrySetRemoveAllNullFromEmpty() {
    try {
      super.testEntrySetRemoveAllNullFromEmpty();
    } catch (RuntimeException tolerated) {
      // GWT's HashMap.entrySet().removeAll(null) doesn't throws NPE.
    }
  }

  @Override
  public final boolean addAll(Collection<? extends E> elementsToAdd) {
    return Multisets.addAllImpl(this, elementsToAdd);
  }

  @CanIgnoreReturnValue
  @Override
  public final boolean removeAll(Collection<?> elementsToRemove) {
    return Multisets.removeAllImpl(this, elementsToRemove);
  }

  @CanIgnoreReturnValue
  @Override
  public final boolean retainAll(Collection<?> elementsToRetain) {

      return standardContainsAll(collection);
    }

    @Override
    public boolean remove(Object object) {
      return standardRemove(object);
    }

    @Override
    public boolean removeAll(Collection<?> collection) {
      return standardRemoveAll(collection);
    }

    @Override
    public boolean retainAll(Collection<?> collection) {
      return standardRetainAll(collection);
    }

      return standardContainsAll(collection);
    }

    @Override
    public boolean remove(Object object) {
      return standardRemove(object);
    }

    @Override
    public boolean removeAll(Collection<?> collection) {
      return standardRemoveAll(collection);
    }

    @Override
    public boolean retainAll(Collection<?> collection) {
      return standardRetainAll(collection);
    }

        }

        public boolean addAll(final int index, final Collection<? extends E> c) {
            return parent.addAll(index, c);
        }

        public boolean removeAll(final Collection<?> c) {
            return parent.removeAll(c);
        }

        public boolean retainAll(final Collection<?> c) {
            return parent.retainAll(c);
        }

        public void clear() {

      return standardContainsAll(collection);
    }

    @Override
    public boolean remove(Object object) {
      return standardRemove(object);
    }

    @Override
    public boolean removeAll(Collection<?> collection) {
      return standardRemoveAll(collection);
    }

    @Override
    public boolean retainAll(Collection<?> collection) {
      return standardRetainAll(collection);
    }

      return standardIterator();
    }

    @Override
    public boolean remove(@Nullable Object object) {
      return standardRemove(object);
    }

    @Override
    public boolean removeAll(Collection<?> collection) {
      return standardRemoveAll(collection);
    }

    @Override
    public boolean retainAll(Collection<?> collection) {
      return standardRetainAll(collection);
    }

      return standardContainsAll(collection);
    }

    @Override
    public boolean remove(Object object) {
      return standardRemove(object);
    }

    @Override
    public boolean removeAll(Collection<?> collection) {
      return standardRemoveAll(collection);
    }

    @Override
    public boolean retainAll(Collection<?> collection) {
      return standardRetainAll(collection);
    }