12/17/2023 0 Comments Airflow xcom between dags![]() ![]() If a connector’s metadata has already been updated before a FivetranSensor starts, which is the case in the examples illustrated above, the sensor will either time out or hang until the connector’s next data sync is started. A FivetranSensor will then monitor this field until Fivetran updates it, signaling the completion of a new data sync. One of the very first things that a FivetranSensor does is collect the timestamp of the connector’s previously completed data sync from a connector’s metadata. In either case, data syncs that a FivetranSensor is supposed to monitor finish before the FivetranSensor can start. If a FivetranSensor is placed in a queued state by a scheduler, a connector’s sync may finish before the FivetranSensor begins running. If many DAGs are running in parallel, every worker slot may be occupied, and Airflow’s scheduler will queue upcoming tasks until a worker slot is available. ![]() Some Airflow deployments have a finite number of workers, which are containers that perform the tasks that make up DAGs. The other reason has to do with Airflow’s limited resources. If this happens, a FivetranSensor may not start until after the connector it is monitoring has already finished syncing data. Some Fivetran connectors take just seconds to move data from its source to destination. But we’ve identified two potential reasons when and why this happens.įirst, short running syncs. Rarely have we seen issues in which a FivetranSensor will keep running and time out after a connector has already finished moving data. Well over 600,000 Fivetran data syncs have run in Airflow since the Fivetran Airflow provider launched in early 2021. ![]() In this post, we’ll describe those issues and demonstrate how they are being resolved in the new version of the Fivetran Airflow provider. However, Airflow provides no guarantees that a FivetranSensor will run immediately after a FivetranOperator, which can cause issues. With Airflow, it’s easy to program a FivetranSensor to start only after a FivetranOperator has successfully run for a connector. The Fivetran Airflow provider includes a FivetranOperator, which starts a Fivetran sync and a FivetranSensor, which monitors a connector until it is finished syncing data. ![]()
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