It is possible to read beyond a prepared update and not be returned a WT_PREPARE_CONFLICT if the config "ignore_prepare=true" or "ignore_prepare=force" is provided during session->begin_transaction. This feature doesn't have a lot of test coverage at this stage and we should expand this in test format.

We should have test format do occasional "ignore_prepare=true" reads to stress the relevant code paths. I would suggest this is a configuration item for test format and only turned on when prepared updates are enabled and even then probably only 5% of the time. The exact amount can vary.

The reads will not be repeatable so it is important to make sure test format doesn't try and verify them.

Scope:

• Add "ignore_prepare" reads to test format
• Run a stress test patch build. If there is signficant fallout create tickets for each failure types and wait to merge this