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  1. Avro
  2. AVRO-1340

use default to allow old readers to specify default enum value when encountering new enum symbols

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.9.0
    • Component/s: spec
    • Labels:
      None
    • Environment:

      N/A

    • Hadoop Flags:
      Incompatible change

      Description

      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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              • Assignee:
                abellemare Adam Bellemare
                Reporter:
                jdonofrio Jim Donofrio
              • Votes:
                19 Vote for this issue
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                24 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: