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https://issues.apache.org/jira/browse/AVRO-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201795#comment-13201795
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Doug Cutting commented on AVRO-1017:
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The correct expected behavior is (2): it should be possible to have a union
with records in different namespaces. Looking at the code it appears that both
the UnionSchema constructor and GenericData#getSchemaName() call
Schema.getFullName(), so I'm not sure how this could fail.
Can you please provide a complete, self-contained test case that illustrates
the problem, ideally as a JUnit test? Thanks!
> org.apache.avro.generic.GenericData.resolveUnion does not deal correctly with
> a union of two records with (different) namespace definitions
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: AVRO-1017
> URL: https://issues.apache.org/jira/browse/AVRO-1017
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.6.1
> Reporter: Joseph Adler
>
> Suppose that you define two different avro objects:
> {"name":"A", "namespace":"com.something", "type":"record", ...}
> {"name":"B", "namespace":"com.anotherthing", "type":"record", ...}
> Then define a union of the two:
> {"name":"bothAAndB", "type":[{"name":"A", "namespace":"com.something",
> "type":"record", ...},{"name":"B", "namespace":"com.anotherthing",
> "type":"record", ...}]}
> If you write an object of type A or B into a GenericRecord and try to use
> org.apache.avro.generic.GenericDatumWriter to store the object, you will get
> an org.apache.avro.UnresolvedUnionException exception.
> Very specifically, it looks like org.apache.avro.UnionSchema.getIndexNamed is
> being called by org.apache.avro.generic.GenericDatumWriter.resolveUnion with
> the short name of the record, but that the org.apache.avro.UnionSchema object
> contains the full names of the objects. So,
> org.apache.avro.UnionSchema.getIndexNamed doesn't find a match and Avro fails
> to find an object in the union that matches the object in the datum.
> So... I'd like to see one of two fixes: (1) an informative error message
> telling me that I can't form a union of records from different namespaces, or
> (2) a successful lookup of the schema and record writing.
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