Wojciech Sroka created AVRO-2149:
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Summary: Using GenericDatumWriter for writing GenericRecord with
schema from the specified generated type
Key: AVRO-2149
URL: https://issues.apache.org/jira/browse/AVRO-2149
Project: Avro
Issue Type: Improvement
Components: java
Affects Versions: 1.8.2
Reporter: Wojciech Sroka
Currently using GenericDatumWriter for writing GenericRecord with schema from
the specified generated type cause exception when one of fields is enum type:
{code:java}
Exception in thread "main"
org.apache.avro.file.DataFileWriter$AppendWriteException:
org.apache.avro.AvroTypeException: Not an enum: YELLOW
at org.apache.avro.file.DataFileWriter.append(DataFileWriter.java:308)
at
pl.ingbank.kafka.AvroErrorTester.runGenericWriterReaderTest(AvroErrorTester.java:65)
at pl.ingbank.kafka.AvroErrorTester.main(AvroErrorTester.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: org.apache.avro.AvroTypeException: Not an enum: YELLOW
at
org.apache.avro.generic.GenericDatumWriter.writeEnum(GenericDatumWriter.java:195)
at
org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:128)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:75)
at
org.apache.avro.generic.GenericDatumWriter.writeField(GenericDatumWriter.java:177)
at
org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:167)
at
org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:118)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:75)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:62)
at org.apache.avro.file.DataFileWriter.append(DataFileWriter.java:302)
... 7 more{code}
It is caused by method protected void writeEnum(Schema schema, Object datum,
Encoder out) in class org.apache.avro.generic.GenericDatumWriter:
{code:java}
if (!data.isEnum(datum)) {
throw new AvroTypeException("Not an enum: " + datum);
}{code}
Fix for this is to add additional check does datum is enum type:
{code:java}
if(datum.getClass().isEnum() && !data.isEnum(datum)){
throw new AvroTypeException("Not an enum: " + datum);
}
{code}
This fix alows to serialize and deserialize generic record with schema from the
specified generated type.
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