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https://issues.apache.org/jira/browse/AIRFLOW-4094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16827942#comment-16827942
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jack commented on AIRFLOW-4094:
-------------------------------
Actually Airflow enforce max size of 49344 bytes.
[https://github.com/apache/airflow/blob/master/airflow/models/xcom.py#L37]
> XCom not pushed into database when size of content is greater than 65535 bytes
> ------------------------------------------------------------------------------
>
> Key: AIRFLOW-4094
> URL: https://issues.apache.org/jira/browse/AIRFLOW-4094
> Project: Apache Airflow
> Issue Type: Bug
> Environment: airflow version: 1.10.0
> python: 3.6.5
> postgresql: 9.6.1
> Reporter: Sai Varun Reddy Daram
> Priority: Major
>
> I happen to use airflow with postgres as backend, one of the things I tried
> recently is use kubernetes pod operator, which will run and return some data
> to next task via XCOMs, one thing I observed is, when the XCOM length is
> greater than 65535 bytes it's not getting pushed into XCOM.
>
>
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