/** Convert writables to a byte array */
public static byte[] toByteArray(Writable... writables) {
final DataOutputBuffer out = new DataOutputBuffer();
try {
for (Writable w : writables) {
w.write(out);
}
out.close();
} catch (IOException e) {
throw new RuntimeException("Fail to convert writables to a byte array", e);
}
return out.getData();
}
