Summary

The wt_hs_insert_updates function calls _hs_insert_record function after fixing the OOO timestamps of a particular update in the update chain. To verify that the OOO timestamps were modified to the correct values I added the following assert in the _hs_insert_record function. The WiredTiger patch succeeded, however, the MongoDB patch had a number of test failures.

WT_ASSERT(session, tw->durable_stop_ts == WT_TS_NONE || tw->durable_stop_ts >= tw->durable_start_ts);

 This seems very strange.

Scope:

• Investigate why timestamps are OOO.
• Write a python reproducer.
• Fix the issue.
• Run a MongoDB patch with the same assert in _hs_insert_record