@SuppressWarnings("NullableProblems")
    @Override
    public void write(final byte[] b) throws IOException {
        dataOutputStream.write(b);
        position += b.length;
    }
Writes <code>b.length</code> bytes from the specified byte array to the
data output stream.
stroom-data/stroom-data-store-impl-fs/src/main/java/stroom/data/store/impl/fs/RASegmentOutputStream.java