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From "Reuven Lax (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-2353) FileNamePolicy context parameters allow backwards compatibility where we really don't want any
Date Mon, 03 Jul 2017 17:15:01 GMT

    [ https://issues.apache.org/jira/browse/BEAM-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16072737#comment-16072737
] 

Reuven Lax commented on BEAM-2353:
----------------------------------

+JB




> 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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