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https://issues.apache.org/jira/browse/BEAM-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles resolved BEAM-2353.
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Resolution: Fixed
> FileNamePolicy context parameters allow backwards compatibility where we
> really don't want any
> ----------------------------------------------------------------------------------------------
>
> Key: BEAM-2353
> URL: https://issues.apache.org/jira/browse/BEAM-2353
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Kenneth Knowles
> Assignee: Reuven Lax
> Fix For: 2.2.0
>
>
> Currently, in {{FileBasedSink}} the {{FileNamePolicy}} object accepts
> parameters of type {{Context}} and {{WindowedContext}} respectively.
> These contexts are a coding technique to allow easy backwards compatibility
> when adding new parameters. However, if a new parameter is added to the file
> name policy it is likely data loss for the user to not incorporate it, so in
> fact that is never a safe backwards compatible change.
> These are brand-new APIs and marked experimental. This is important enough I
> think we should make the breaking change.
> We should inline all the parameters of the context, so that we _cannot_ add
> parameters and maintain compatibility. Instead, if we have new ones we want
> to add, it will have to be a new method or some such.
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