yuseok89 opened a new pull request, #75674:
URL: https://github.com/apache/airflow/pull/75674
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The dashboard polls for running or queued Dag runs to decide whether to
auto-refresh, every 3 seconds while runs are active. The check fetched one Dag
run ordered by id. When the statistics from the last ANALYZE count some pending
runs, Postgres serves that by scanning `dag_run` by primary key from the oldest
run, and since pending runs are the newest it reads nearly the whole table.
Only the count is used, so the check now asks for no rows and reads
`total_entries`.
Measured on Postgres with 5M finished runs, through the real endpoint.
| Running or queued runs | Before (`limit=1`) | After (`limit=0`) |
|---|---|---|
| 70 | 3.3 to 11.8 s | 1 ms |
The new test mocks the endpoint to return only `limit` rows with the full
count in `total_entries`, as the API does. It checks that refresh still turns
on and that every request asks for `limit=0`, and it fails on main.
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