SpecificDatumWriter is using GenericData.resolveUnion sometimes
---------------------------------------------------------------
Key: AVRO-717
URL: https://issues.apache.org/jira/browse/AVRO-717
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.4.1
Environment: Mac, Java 6.
Reporter: Joe Crobak
From:
[avro-user|http://mail-archives.apache.org/mod_mbox/avro-user/201012.mbox/%[email protected]%3e]
I've tried to use union of null and the enum-type, but I've run into an issue
with this approach when using the AvroOutputFormat. The following code
summarizes my issue:
{code}
public void testDataWriteWithSchema() throws IOException {
final DataFileWriter<Event writer =
new DataFileWriter<Event>(new SpecificDatumWriter<Event>());
writer.create(Event.SCHEMA$, new File("target/datafile-test.avro"));
writer.append(getEvent());
writer.close();
}
public void testDataWriteWithSchemaWithClass() throws IOException {
final DataFileWriter<Event writer =
new DataFileWriter<Event>(new SpecificDatumWriter<Event>(Event.class));
writer.create(Event.SCHEMA$, new File("target/datafile-test.avro"));
writer.append(getEvent());
writer.close();
}
{code}
When I don't pass in the Event.class to SpecificDatumWriter (the first test
method), the above test fails with the following exception:
{noformat}
Not in union ["null",
{"type":"enum","name":"Suit","namespace":"foo","symbols":["SPADES","CLUBS","HEARS","DIAMONDS"]}]:
SPADES
at org.apache.avro.generic.GenericData.resolveUnion(GenericData.java:382)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:67)
at
org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:100)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:62)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:54)
at org.apache.avro.file.DataFileWriter.append(DataFileWriter.java:245)
{noformat}
Scott Carey's reply:
{quote}
This looks like a bug. Can you file a ticket? In the first case, the
constructor is not
initializing the SpecificData object, which means that it is using
GenericData.resolveUnion()
instead of SpecificData.resolveUnion().
The empty param constructor in SpecificDatumWriter should be
public SpecificDatumWriter() \{ super(SpecificData.get()); }
public SpecificDatumWriter() { }
{quote}
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