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Posted to dev@avro.apache.org by "Daniel Abrahamsson (JIRA)" <ji...@apache.org> on 2017/11/13 12:24:00 UTC
[jira] [Commented] (AVRO-1340) use default to allow old readers to
specify default enum value when encountering new enum symbols
[ https://issues.apache.org/jira/browse/AVRO-1340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16249501#comment-16249501 ]
Daniel Abrahamsson commented on AVRO-1340:
------------------------------------------
One difference between the alias and fallback proposals, is that the former would affect the data format, whereas the latter would not. I think that makes the fallback proposal favorable.
> use default to allow old readers to specify default enum value when encountering new enum symbols
> -------------------------------------------------------------------------------------------------
>
> Key: AVRO-1340
> URL: https://issues.apache.org/jira/browse/AVRO-1340
> Project: Avro
> Issue Type: Improvement
> Components: spec
> Environment: N/A
> Reporter: Jim Donofrio
> Priority: Minor
>
> The schema resolution page says:
> > if both are enums:
> > if the writer's symbol is not present in the reader's enum, then an
> error is signalled.
> This makes it difficult to use enum's because you can never add a enum value and keep old reader's compatible. Why not use the default option to refer to one of enum values so that when a old reader encounters a enum ordinal it does not recognize, it can default to the optional schema provided one. If the old schema does not provide a default then the older reader can continue to fail as it does today.
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