[Disagg] test_checkpoint06: KeyError reading back key after rollback truncation in checkpoint (disagg-leader hook)

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      unit-test-hook-disagg-leader-table-bucket00 on ubuntu2004-release

      Host: i-059858e7df2579675
      Project: wiredtiger
      Commit: 9909e455
      Please refer to BF(G) Playbook for instructions on handling BF and BFG tickets as well as Auto-Resolution Rules

      Task Logs:

      unit-test-hook-disagg-leader-table-bucket00 task_log

      Logs:

      [pid:63252]: ERROR: test_checkpoint06.test_checkpoint06.test_rollback_truncation_in_checkpoint(row_integer.no_prepare)
----------------------------------------------------------------------
[pid:63252]: testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/data/mci/d5556eaa3453763fc26bc479dce52631/wiredtiger/test/suite/wttest.py", line 161, in wrapper
    return func(self, *args, **kwargs)
  File "/data/mci/d5556eaa3453763fc26bc479dce52631/wiredtiger/test/suite/wttest.py", line 309, in _callTestMethod
    method()
  File "/data/mci/d5556eaa3453763fc26bc479dce52631/wiredtiger/test/suite/test_checkpoint06.py", line 108, in test_rollback_truncation_in_checkpoint
    self.assertEqual(cursor[i], value)
  File "/data/mci/d5556eaa3453763fc26bc479dce52631/wiredtiger/cmake_build/lang/python/wiredtiger/swig_wiredtiger.py", line 337, in __getitem__
    raise KeyError
KeyError
----------------------------------------------------------------------
Ran 2654 tests in 179.393s

      logs

      Root cause:

      On a leader, a checkpoint can persist a committed truncate whose stop is newer than the stable timestamp, and reconciliation also marked the on-page value durable. After rollback to stable aborts the tombstone, the value is selected with no tombstone and, being durable, looks unchanged from the previous reconciliation; the skip-write path then keeps the old image (value plus stop) and the key reads back WT_NOTFOUND.

            Assignee:
            Alex Blekhman
            Reporter:
            xgen-buildbaron-user
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              Created:
              Updated: