Details
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Task
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Resolution: Fixed
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Major - P3
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None
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Fully Compatible
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Query 2020-08-24
Description
One specific scenario we should test is:
4.6 node runs a retryable write which logs a delta oplog entry |
4.6 node downgrades FCV to 4.4 |
4.6 node downgrades binary to 4.4 |
Client retries the write performed earlier. This will cause the 4.4 node to fetch the associated oplog entry |
Check that the write was indeed only performed once
|
There may be other interesting scenarios we haven't thought of yet.