Dan Davydov created AIRFLOW-2173:
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Summary: Don't check task IDs for concurrency reached check
Key: AIRFLOW-2173
URL: https://issues.apache.org/jira/browse/AIRFLOW-2173
Project: Apache Airflow
Issue Type: Bug
Components: core
Reporter: Dan Davydov
Assignee: Dan Davydov
Currently the concurrency reached check does a filter in the DB query to only
include tasks that are currently in the parsed DAG. For sufficiently large DAGs
with many tasks, this causes mysql to use an inefficient query plan and can put
a lot of load on the database. Since there is no good reason to omit old
running tasks in a DAG from concurrency, this filter should just be removed.
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