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https://issues.apache.org/jira/browse/AIRFLOW-1705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201656#comment-16201656
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Igor Cherepanov commented on AIRFLOW-1705:
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I could solve it that way
[https://stackoverflow.com/questions/39073443/how-do-i-restart-airflow-webserver]
but I would like to know the cause of this error
> Error: Already running on PID
> -----------------------------
>
> Key: AIRFLOW-1705
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1705
> Project: Apache Airflow
> Issue Type: Bug
> Components: webserver
> Reporter: Igor Cherepanov
>
> what cause this error?
> {code:java}
> ic@ic-P900:~/airflow/dags$ airflow webserver
> [2017-10-12 10:20:47,109] {__init__.py:57} INFO - Using executor
> SequentialExecutor
> [2017-10-12 10:20:47,196] {driver.py:120} INFO - Generating grammar tables
> from /usr/lib/python3.5/lib2to3/Grammar.txt
> [2017-10-12 10:20:47,226] {driver.py:120} INFO - Generating grammar tables
> from /usr/lib/python3.5/lib2to3/PatternGrammar.txt
> ____________ _____________
> ____ |__( )_________ __/__ /________ __
> ____ /| |_ /__ ___/_ /_ __ /_ __ \_ | /| / /
> ___ ___ | / _ / _ __/ _ / / /_/ /_ |/ |/ /
> _/_/ |_/_/ /_/ /_/ /_/ \____/____/|__/
>
> /usr/local/lib/python3.5/dist-packages/flask/exthook.py:71:
> ExtDeprecationWarning: Importing flask.ext.cache is deprecated, use
> flask_cache instead.
> .format(x=modname), ExtDeprecationWarning
> [2017-10-12 10:20:47,692] [3690] {models.py:167} INFO - Filling up the DagBag
> from /home/ic/airflow/dags
> Running the Gunicorn Server with:
> Workers: 4 sync
> Host: 0.0.0.0:8080
> Timeout: 120
> Logfiles: - -
> =================================================================
> [2017-10-12 10:20:48,464] {__init__.py:57} INFO - Using executor
> SequentialExecutor
> [2017-10-12 10:20:48,548] {driver.py:120} INFO - Generating grammar tables
> from /usr/lib/python3.5/lib2to3/Grammar.txt
> [2017-10-12 10:20:48,577] {driver.py:120} INFO - Generating grammar tables
> from /usr/lib/python3.5/lib2to3/PatternGrammar.txt
> [2017-10-12 10:20:48 +0200] [3697] [INFO] Starting gunicorn 19.3.0
> Error: Already running on PID 2446 (or pid file
> '/home/ic/airflow/airflow-webserver.pid' is stale)
> {code}
> thanks!
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