mik-laj commented on issue #5974: [AIRFLOW-5367] Remove hook initialization in ctor from BigtableTableWaitForReplicationSensor URL: https://github.com/apache/airflow/pull/5974#issuecomment-527230332 Currently, hook initialization calls the database, so it has a very large impact on the database load. Each DAG processing results in a query to the database, and this happens very often.
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