Writing multiple tf.train.Example to a TFRecord

This (unanswered) post accurately summarizes the question: python - Writing TFRecords in batches - Stack Overflow

I want to speed up a multi-thread script, so I wanted to look to append multiple tf.train.Example in a single list and then write them to the serial TFRecord. How can I accomplish that?

Writing thousands of TFRecords with the conventional method seems a bad idea for my dataset, potentially slowing down data reading and creating a bottleneck.