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DBZ-7789 Adds warning explaining unexpected behavior of lookup setting

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roldanbob 2024-04-18 15:50:49 -04:00 committed by Jiri Pechanec
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documentation/modules/ROOT/pages/connectors/mongodb.adoc
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@ -1874,6 +1874,15 @@ Pre- and post-images for an operation are available only if the required configu
Set this property to one of the following values:
`lookup`:: The connector uses a separate lookup to fetch the updated full MongoDB document.
[WARNING]
====
If the lookup process fails to retrieve a document, it cannot populate the full document to the `after` state in the event payload.
In such a situation, the connector emits an event message that contains a `null` value in the `after` field.
Failed lookups can occur because a delete operation removed the document immediately after it was created, or because a change to the sharding key results in the document being moved to a different location.
Sharding key changes can result when you modify any of the properties that make up the key.
====
`post_image`:: The connector uses MongoDB post images to populate events with the full MongoDB document.
The database must be running MongoDB 6.0 or later to use this option.