/** {@inheritDoc} */
@Override
public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(id);
boolean writable = innerSplit instanceof Writable;
out.writeUTF(writable ? innerSplit.getClass().getName() : null);
if (writable) ((Writable) innerSplit).write(out);
else out.writeObject(innerSplit);
}
