@Override
                    public FileVisitResult visitFileFailed(final Path file,
                                                           final IOException exc) {
                        return FileVisitResult.CONTINUE;
                    }
@return The size of all result stores. Assumes no other files are stored in the configured
localDir.
stroom-query/stroom-query-common/src/main/java/stroom/query/common/v2/LmdbDataStoreFactory.java