hollow/src/main/java/com/netflix/hollow/core/write/HollowObjectWriteRecord.java
public void writeDataTo(ByteDataBuffer buf) {
        for (int i = 0; i < fieldData.length; i++) {
            writeField(buf, i);
        }
    }
public void writeDataTo(ByteDataBuffer buf) {
        for (int i = 0; i < fieldData.length; i++) {
            writeField(buf, i);
        }
    }
Concatenates all fields, in order, to the ByteDataBuffer supplied.  This concatenation is the
verbatim serialized representation in the FastBlob.

@param buf the data buffer to write data to