Jacob Tolar created AVRO-2400:
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Summary: Avro 1.9.0 can't resolve schemas that can be resolved in
1.8.2
Key: AVRO-2400
URL: https://issues.apache.org/jira/browse/AVRO-2400
Project: Apache Avro
Issue Type: Bug
Components: java
Reporter: Jacob Tolar
The failure occurs in ResolvingGrammarGenerator when reader and writer schema
have an array of records with different full names (e.g. different namespace).
{code:java}
Exception in thread "main" java.lang.ClassCastException:
org.apache.avro.Resolver$ReaderUnion cannot be cast to
org.apache.avro.Resolver$Container{code}
Avro 1.8.2 allowed this behavior but it now fails in 1.9.0. Looking at the
jiras and code, I don't believe this was intentional ( AVRO-2275,
[https://github.com/apache/avro/commit/39d959e1c6a1f339f03dab18289e47f27c10be7f]
).
It looks like there were some attempts to keep compatibility (
[https://github.com/apache/avro/blob/branch-1.9/lang/java/avro/src/main/java/org/apache/avro/Resolver.java]
, e.g. see the commented out check for w.getFullName() in resolve()) but this
case was missed.
See this simple example to reproduce.
[https://gist.github.com/jacobtolar/c88d43ab4e8767227891e5cdc188ffad]
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