private void dumpMdbFileSize() {
        if (Files.isDirectory(localDir)) {

            try (Stream<Path> stream = Files.list(localDir)) {
                stream
                        .filter(path ->
                                !Files.isDirectory(path))
                        .filter(file ->
                                file.toString().toLowerCase().endsWith("data.mdb"))
                        .map(file -> {
                            try {
                                final long fileSizeBytes = Files.size(file);
                                return localDir.getFileName().resolve(file.getFileName())
                                        + " - file size: "
                                        + ModelStringUtil.formatIECByteSizeString(fileSizeBytes);
                            } catch (IOException e) {
                                throw new RuntimeException(e);
                            }
                        })
                        .forEach(LOGGER::debug);

            } catch (IOException e) {
                LOGGER.debug("Unable to list dir {} due to {}",
                        localDir.toAbsolutePath().normalize(), e.getMessage());
            }
        }
    }
Deletes {@link LmdbEnv} from the filesystem if it is already closed.
stroom-lmdb/src/main/java/stroom/lmdb/LmdbEnv.java