Fokko Driesprong resolved AIRFLOW-2173.
       Resolution: Fixed
    Fix Version/s: 2.0.0

Issue resolved by pull request #3099

> 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
>            Priority: Major
>             Fix For: 2.0.0
> 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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