[AVRO-1512] Error serializing TUnion with avro-thrift

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.7.6
• Fix Version/s: 1.7.7
• Component/s: java
• Assignee: Doug Cutting
• Reporter: Will Gorman
• Created: 20/May/14 14:08
• Updated: 24/Jul/14 20:16
• Resolved: 28/May/14 22:20

Description

Attempting to serialize a Thrift union type (TUnion) with avro-thrift produces an error like the following:

org.apache.avro.AvroRuntimeException: Unknown datum type org.apache.avro.thrift.test.FooOrBar: <FooOrBar foo:foo>
	at org.apache.avro.generic.GenericData.getSchemaName(GenericData.java:639)
	at org.apache.avro.generic.GenericData.resolveUnion(GenericData.java:604)
	at org.apache.avro.generic.GenericDatumWriter.resolveUnion(GenericDatumWriter.java:151)
	at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:71)
	at org.apache.avro.generic.GenericDatumWriter.writeField(GenericDatumWriter.java:114)
	at org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:104)
	at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:66)
	at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:58)
	at org.apache.avro.thrift.TestThrift.check(TestThrift.java:83)
	at org.apache.avro.thrift.TestThrift.testStruct(TestThrift.java:60)

Upon investigation it appears that ThriftData#isRecord intentionally does not accept TUnion types as Avro records and so GenericData is unable to determine an Avro type for the datum. However, ThriftData#getSchema does generate an Avro record schema for Thrift union types.