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https://issues.apache.org/jira/browse/AIRFLOW-1219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16681998#comment-16681998
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holdenk commented on AIRFLOW-1219:
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I believe this issue has been fixed in 28aeed4aa62acb295eda1cf94a40f7f643b650fb
in AIRFLOW-1255
> Spark submit hook fix realtime logging.
> ---------------------------------------
>
> Key: AIRFLOW-1219
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1219
> Project: Apache Airflow
> Issue Type: Bug
> Reporter: Kris Geusebroek
> Priority: Major
>
> Redirecting the logging to airflow doesn't work correctly.
> Spark's logging goes to stderr and output of the spark program goes to
> stdout. In the loop of the two sources stdout is used first.
> It seems to be blocking until output is written at the end of the
> spark-submit execution.
> Fix this by connecting stderr to stdout in the subprocess invocation and only
> pipe stdout to the airflow logging
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