Enable MongoDB sink with unique fields in MongoDB Sharded cluster #135
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Updates: - Create a new toggle (`isUseFilterInValueDoc`) in the `MongoDbUpdate` to enable using the `filter` field provided by Debezium. - Create a new class (`MongoDbUniqueFieldHandler`) to provide default operations with the `isUseFilterInValueDoc` enabled. - Adjust `MongoDbHandler` and `ChangeStreamHandler` to provide default operations with the `isUseFilterInValueDoc` disabled. - Add some new unit tests.
davidch93
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davidch93
changed the title
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Updates:
isUseFilterInValueDoc) in theMongoDbUpdateto enable using thefilterfield provided by Debezium.MongoDbUniqueFieldHandler) to provide default operations with theisUseFilterInValueDocenabled.MongoDbHandlerandChangeStreamHandlerto adjust default operations with theisUseFilterInValueDocdisabled.Problem Statements
Our use case is to migrate data to a new MongoDB Sharded cluster. Our approach is to use CDC (Debezium). When replicating data to the new cluster, we got an error regarding the shard key with the following details.
The current situation is that we have unique fields enabled for some collections in our Sharded cluster. We also use the same unique fields in our new Sharded cluster. The error happened because the MongoDB Sink connector doesn't provide the unique fields information when upserting data.
Solution
As you may know, Debezium provides a
filterfield in its payload, as shown below.{ "after": null, "patch": "{\"$v\": 1,\"$set\": {\"updated_at\": {\"$date\": 1678606630819}}}", "filter": "{\"transaction_id\": {\"$numberLong\": \"1234\"},\"_id\": {\"$oid\": \"63a3edd806add30266cb831f\"}}" }Thus, we want to use the
filterinformation as a filter when upserting data to solve our problem.