Details
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Bug
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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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ALL
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Sharding EMEA 2021-05-03
Description
When upgrading fcv to 5.0, the configsvr will patch-up the sharding metadata. In particular, it will set a 'timestamp' on the config.databases documents.
If this patch up happens concurrently with a commitMovePrimary, it could happen that commitMovePrimary reads the current config.databases entry (without timestamp), then the setFCV thread patches up the entry so it has a timestamp, and finally, the commitMovePrimary writes the updates database version without a timestamp.