Transactional access to the index

[kazurayam]

I want to distribute a bunch of materialzing a lot of URL in a JobTimestamp directory.
The object files will be safe.
But the index file can be corrupted if accessed by multiple processed simultaneously. How to prevent the index file being corrupted?

One idea is to use AWS DynamoDB Transaction.

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/transaction-apis.html