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Date: Wed, 6 Sep 2017 11:38:01 +0000 (UTC)
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Subject: [jira] [Commented] (AIRFLOW-1562) Spark-sql deadlock in logging
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archived-at: Wed, 06 Sep 2017 11:38:11 -0000


    [ https://issues.apache.org/jira/browse/AIRFLOW-1562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16155225#comment-16155225 ] 

ASF subversion and git services commented on AIRFLOW-1562:
----------------------------------------------------------

Commit 32750601ad0a422283613bf7fccff8eb5407bc9c in incubator-airflow's branch refs/heads/master from [~Fokko]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-airflow.git;h=3275060 ]

[AIRFLOW-1562] Spark-sql logging contains deadlock

Logging in SparkSqlOperator does not work as
intended. Spark-sql
internally redirects all logs to stdout (including
stderr),
which causes the current two iterator logging to
get stuck with
the stderr pipe. This situation can lead to a
deadlock
because the std-err can grow too big and it will
start to block
until it will be consumed, which will only happen
when the process
ends, so the process stalls.

Closes #2563 from Fokko/AIRFLOW-1562-Spark-sql-
loggin-contains-deadlock


> Spark-sql deadlock in logging
> -----------------------------
>
>                 Key: AIRFLOW-1562
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1562
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: hooks
>    Affects Versions: Airflow 1.8
>            Reporter: Fokko Driesprong
>
> Related to Issue 1255
> Logging in SparkSqlOperator does not work as intended (continuous logging as received in the subprocess). This is because, spark-sql internally redirects all logs to stdout (including stderr), which causes the current two iterator logging to get stuck with empty stderr pipe. Also this situation can lead to a deadlock because the std-err can grow too big and it will start to block until it gets consumed, which will only happen when the process ends, so the process stalls.


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