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After flushing the WAL, the db may attempt an automatic checkpoint. Previously,
a checkpoint failure for any other reason than `Busy` rolled back the transaction;
this is incorrect because the WAL has already been written and synced, so the transaction
is actually committed and durable.
For this reason, do the following decoupling:
- Mark the transaction as committed after `SyncWal`
- Any errors beyond that point are wrapped as `LimboError::CheckpointFailed` which is
handled specially:
* Tx rollback is not attempted in `abort()` - only the WAL locks are cleaned up
and checkpoint state machines are reset
* In the simulator, the results of the query are shadowed into the sim environment
so that the sim correctly assumes that the transaction's effects were in fact
committed.
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| io.rs | ||
| mod.rs | ||