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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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None
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Fully Compatible
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ALL
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Execution Team 2021-06-28
SERVER-51387 introduced an invariant that MDB never sets a stable timestamp that is smaller than the all durable timestamp.
However, it uses a method that subtly returns the maximum ever seen all_durable value. It would be preferable to use a raw value.
An example of an assertion that passes when it should fail:
| Good Writer | Ghost Writer | all_durable | max(all_durable) | Stable Setter | |-----------------+-----------------------+-------------+------------------+-------------------------------------------| | BeginTxn | | | | | | SetTimestamp 10 | | 9 | 9 | | | | | | | Reads 9 | | | | | | Asserts 9 <= max(all_durable, 9) | | | | | | Sets 9 | | Commit | | 10 | 10 | | | | | | | Reads 10 | | | | | | Asserts 10 <= max(all_durable, 10) | | | | | | Sets 10 | | | BeginTxn | | | | | | Read LogicalClock(20) | | | | | BeginTxn | | | | | | SetTimestamp 20 | | 19 | 19 | | | Commit | | | | | | | | 20 | 20 | | | | | | | Reads 20 | | | SetTimestamp 20 | 19 | 20 | | | | | | | Asserts 20 <= max(all_durable, 20) versus | | | | | | Asserts 20 <= all_durable (19) |
- is related to
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- Closed
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SERVER-51387 Assert that the stable timestamp is never set higher than the WT all_durable timestamp
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- Closed
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