Mongo Change stream pre-image support

[Xinbin Huang]

Hi friends, 

Mongo 6.0 now officially supports emitting document pre-image in change streams. Our team is currently investigating on how we can capture the pre-image information from Debezium. 

I think a potential implementation can be 

- a config flag to enable capturing pre-image from change stream i.e. change_stream_preimage 

- an extra before field in the change event to captures the pre-image. This behavior is the same as other DBs e.g. postgres, mysql.

Any thoughts? 

Best

Bin

[jiri.p...@gmail.com]

Hi,

great news, thanks for handling that feature! I agree with using before field in the same way we already use after when full updates are enabled.

For the configuration could we reuse https://debezium.io/documentation/reference/2.0/connectors/mongodb.html#mongodb-property-capture-mode ? In that case it will be multistate

- no before/after

- after only

- before only

- both before/after

WDYT?

J.

[Xinbin Huang]

Hi J.,

We can definitely reuse the current capture mode config. I've created a draft PR. Let's continue the discussion on implementation there?

Bin

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