Ruma Nair created AVRO-1184:
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Summary: GenericDatumReader throws an error when it tries to cache
a resolver
Key: AVRO-1184
URL: https://issues.apache.org/jira/browse/AVRO-1184
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.6.3
Reporter: Ruma Nair
When the GenericDatumReader tries to create a resolver with the reader schema
which contains a union where the default value is incompatible with the first
field. It throws an error. As the resolvers are cached, when the resolver is
not created, it is not pushed in the cache which results in an attempt to
create a resolver whenever it tries to read a message. A possible fix is to not
have a lazy initialization of the resolver but to have it at time of the
creation of GenericDatumReader and handle the error at start. This ensures that
the datumReader fails fast and will not try to create the resolver everytime it
tries to read a message. An example of the reader schema
String readerSchemaDescription = " { \n"
+ " \"name\": \"User\", \n"
+ " \"type\": \"record\",\n" + " \"fields\": [\n"
+ " {\"name\": \"id\", \"type\": \"int\"},\n"
+ " {\"name\": \"temp\", \"type\": [\"null\",\"string\"],
\"default\":\"foo\"},\n"
+ " {\"name\": \"name\", \"type\": \"string\", \"default\":\"avro\"}
]\n" + "}";
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