ASF GitHub Bot commented on AVRO-1340:

cutting commented on a change in pull request #298: AVRO-1340: Added Enum 
Defaults and unit tests.
URL: https://github.com/apache/avro/pull/298#discussion_r174256844

 File path: lang/java/avro/src/main/java/org/apache/avro/Schema.java
 @@ -765,6 +781,7 @@ public boolean equals(Object o) {
         && symbols.equals(that.symbols)
         && props.equals(that.props);
+    public String getEnumDefault() { return enumDefault; }
 Review comment:
   needs @Override?

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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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