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Update docs about control topic reuse #197

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Update docs about control topic reuse #197

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Expand Up @@ -57,6 +57,11 @@ contain the name of the table. Enabling `iceberg.tables.upsert-mode-enabled` wil
preceded by an equality delete. Both CDC and upsert mode require an Iceberg V2 table with identity fields
defined.

It is safe to reuse the same `iceberg.control.topic` for multiple connectors as this is expected to be a
relatively low traffic topic. Connectors can distinguish between which messages are relevant to them or not by looking
at the `iceberg.control.group-id` that is encoded inside each message for this purpose. Naturally, this does mean that
`iceberg.control.group-id` cannot be shared between multiple connectors.

## Kafka configuration

By default the connector will attempt to use Kafka client config from the worker properties for connecting to
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