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https://issues.apache.org/jira/browse/BEAM-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ahmet Altay updated BEAM-7395:
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    Description: Users are going to mutate inputs and outputs of DoFn 
inappropriately. We should help their tests fail to catch such mistakes. 
(Similar to the DirectPipelineRunner in Java SDK) This should be offered as an 
option and worked based on sampling because of the cost of these checks.  (was: 
Users are going to mutate inputs and outputs of DoFn inappropriately. We should 
help their tests fail to catch such mistakes. (Similar to the 
DirectPipelineRunner in Java SDK))

> Check immutability violations in Dataflow Runner (as an option)
> ---------------------------------------------------------------
>
>                 Key: BEAM-7395
>                 URL: https://issues.apache.org/jira/browse/BEAM-7395
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-py-core
>            Reporter: Ahmet Altay
>            Priority: Minor
>              Labels: newbie, starter
>
> Users are going to mutate inputs and outputs of DoFn inappropriately. We 
> should help their tests fail to catch such mistakes. (Similar to the 
> DirectPipelineRunner in Java SDK) This should be offered as an option and 
> worked based on sampling because of the cost of these checks.



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