If my Airbyte syncs returned no data for an incrementally updated stream, is there a way for my orchestrator to programatically find this out?

If your Airbyte syncs returned no data for an incrementally updated stream, you can programmatically determine this by checking if no records have been emitted during the sync. This can be confirmed by executing a sync and verifying the results. From the provided knowledge sources, here are the relevant steps: 1. Execute the Sync: Trigger the sync operation. 2. Verify Emitted Records: Check if any records have been emitted. If no records are emitted, it indicates that there were no changes or new data to sync. For example, in the context of incremental append synchronization, you can confirm this by clicking Sync now and then verifying that no records have been emitted: > "You can confirm this by clicking Sync now and then verifying that no records have been emitted as shown below." > [Source](https://airbyte.com/tutorials/incremental-data-synchronization#step-6) Similarly, for incremental deduped + history synchronization: > "If a sync is executed without making any modifications on the source database, no records will be emitted, and no changes will be made on the destination database. You can confirm this by clicking Sync now and then verifying that no records have been emitted as shown below." > [Source](https://airbyte.com/tutorials/incremental-data-synchronization#step-7) To programmatically check this, you would typically look at the sync job's output or logs to see if any records were processed. If your orchestrator can access these logs or outputs, it can determine whether any data was emitted during the sync. For more detailed information, you can refer to the Airbyte documentation on [incremental sync modes](https://docs.airbyte.com/using-airbyte/core-concepts/sync-modes/incremental-append#known-limitations) and [incremental deduped sync modes](https://docs.airbyte.com/using-airbyte/core-concepts/sync-modes/incremental-append-deduped#known-limitations).

For anyone who might find this in the future, it looks like we can get

bytesSynced

and

rowsSynced

here: https://reference.airbyte.com/reference/getjob

Airbyte uses Debezium to implement MySQL Change Data Capture (CDC), which simplifies the process of reading and processing binlog files. Here’s how it works: 1. Reading the Binlog Files: - MySQL's binary log (binlog) records all operations committed to the database, including DDL and changes to the tables' data. This log is crucial for recovery and replication. - Airbyte leverages Debezium, an open-source framework for Change Data Capture, to scan the MySQL binlog in near real-time. Debezium streams every row-level committed operation (such as insert, update, and delete) while maintaining the sequence of operations. 2. Handling New Log Files: - When the log file reaches its size limit, MySQL creates a new log file with a higher index (e.g., bin-log.00001 → bin-log.00002). Airbyte, through Debezium, handles these new files created by the log system seamlessly. This ensures that the data capture process continues without interruption. 3. Syncing Data: - During the initial sync, Airbyte takes a snapshot of the current state of the data using a

SELECT

statement, which is effectively a Full Refresh. - For subsequent syncs, Airbyte reads data from the previously synced position in the logs up to the start time of the sync. This means that Airbyte does not treat CDC sources as infinite streaming sources but rather processes the logs incrementally. - Airbyte keeps track of the current log position between syncs, ensuring that it only processes new changes since the last sync. 4. Updating Data for Each Stream: - Airbyte uses the Debezium core engine and Debezium MySQL connector to connect to the database and parse the binlog in JSON format. The JSON records are then passed onto the destination. - The Airbyte Protocol outputs records from sources, and records from

UPDATE

statements appear the same way as records from

INSERT

statements. This allows for flexible handling of data updates in the destination. For more detailed information, you can refer to the following sources: - [Consuming the MySQL binary log with Debezium](https://airbyte.com/tutorials/mysql-change-data-capture-cdc) - [Syncing Part 1](https://docs.airbyte.com/understanding-airbyte/cdc#syncing) - [Forum Post: Source MySQL CDC binlog files](https://discuss.airbyte.io/t/128) If you have any further questions or need more specific details, feel free to ask!