Downgrading from 4.4 -> 4.2.6 -> 4.2.x (x < 6) is not allowed. The current state of 4.2.6 will always write out log version 3 which earlier 4.2 versions understand. However, earlier 4.2 versions will fail to startup on the checkpointed data files in a messy way (likely a seg fault)
Instead, 4.2.6 could discover if it's reading log version 4 records at startup (which is only possible via a 4.4 downgrade) and choose to write out log version 4 records. This would result in earlier versions failing with an "incompatible log version" error.
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SERVER-47538 `runMongoProgram` should omit auth options on multiversion mongod binaries
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- Closed
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- Closed
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WT-6011 Bump the compatibility version for MongoDB v4.5 to distinguish from 4.4
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- Closed
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