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https://issues.apache.org/jira/browse/AIRFLOW-1038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arthur Wiedmer resolved AIRFLOW-1038.
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Resolution: Fixed
Fix Version/s: 1.9.0
Issue resolved by pull request #2185
[https://github.com/apache/incubator-airflow/pull/2185]
> Specify celery serializers explicitly and pin version
> -----------------------------------------------------
>
> Key: AIRFLOW-1038
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1038
> Project: Apache Airflow
> Issue Type: Bug
> Reporter: Alex Guziel
> Assignee: Alex Guziel
> Fix For: 1.9.0
>
>
> Celery 3->4 upgrade changes the default task and result serializer from
> pickle to json. Pickle is faster and supports more types
> http://docs.celeryproject.org/en/latest/userguide/calling.html
> This also causes issues when different versions of celery are running on
> different hosts.
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