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https://issues.apache.org/jira/browse/AIRFLOW-2404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16601626#comment-16601626
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Apache Spark commented on AIRFLOW-2404:
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User 'AetherUnbound' has created a pull request for this issue:
https://github.com/apache/incubator-airflow/pull/3286
> Message for why a DAG run has not been scheduled missing information
> --------------------------------------------------------------------
>
> Key: AIRFLOW-2404
> URL: https://issues.apache.org/jira/browse/AIRFLOW-2404
> Project: Apache Airflow
> Issue Type: Improvement
> Components: webserver
> Reporter: Matthew Bowden
> Assignee: Matthew Bowden
> Priority: Major
> Fix For: 2.0.0
>
>
> The webserver lists the following reasons for why a DAG run/task instance
> might not be started:
> * The scheduler is down or under heavy load
> * This task instance already ran and had its state changed manually (e.g.
> cleared in the UI)
> Another reason that the task might not have been started is because of the
> following:
> * The {{parallelism}} configuration value may be too low
> * The {{dag_concurrency}} configuration value may be too low
> * The {{max_active_dag_runs_per_dag}} configuration value may be too low
> * The {{non_pooled_task_slot_count}} configuration value may be too low
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