@NotNull
    private FetchDataResult createEmptyResult(final FetchDataRequest fetchDataRequest,
                                              final String feedName,
                                              final String streamTypeName,
                                              final SourceLocation sourceLocation,
                                              final Set<String> childStreamTypes,
                                              final List<String> errors,
                                              final Count<Long> itemCount) {
        final OffsetRange itemRange = new OffsetRange(0L, (long) 1);
        final Count<Long> totalCharCount = Count.zeroLong();

        return new FetchDataResult(
                feedName,
                streamTypeName,
                null,
                sourceLocation,
                itemRange,
                itemCount,
                totalCharCount,
                null,
                childStreamTypes,
                null,
                fetchDataRequest.isShowAsHtml(),
                null,
                getDisplayModeOrDefault(fetchDataRequest),
                errors);  // Don't really know segmented state as stream is gone
    }
How big our buffers are. This should always be a multiple of 8.
stroom-data/stroom-data-store-impl/src/main/java/stroom/data/store/impl/DataFetcher.java