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https://issues.apache.org/jira/browse/AVRO-1340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16441068#comment-16441068
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ASF GitHub Bot commented on AVRO-1340:
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bellemare commented on issue #298: AVRO-1340: Added Enum Defaults and unit
tests.
URL: https://github.com/apache/avro/pull/298#issuecomment-382043682
@cutting - Thanks Doug. I applied the patch, added a test and built the
tooling to validate that it works. Is there anything else you forsee being
required? Also, do we need additional eyes on this? I recall that someone
mentioned in the JIRA thread about the "@default" annotation - I don't have any
idea how it would interact with this.
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> 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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