Lorenzo Nicora created FLINK-17486:
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Summary: ClassCastException when copying AVRO SpecificRecord containing a decimal field
Key: FLINK-17486
URL:
https://issues.apache.org/jira/browse/FLINK-17486 Project: Flink
Issue Type: Bug
Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile)
Affects Versions: 1.10.0
Environment: Flink 1.10.0
AVRO 1.9.2
Java 1.8.0 (but also Java 14)
Scala binary 2.11
Reporter: Lorenzo Nicora
When consuming from a Kafka source AVRO SpecificRecord containing a {{decimal}} (logical type) field, copying the record fails with:
{{java.lang.ClassCastException: class java.math.BigDecimal cannot be cast to class java.nio.ByteBuffer}}
This code reproduces the problem:
{{AvroSerializer<Sample> serializer = new AvroSerializer<>(Sample.class);}}
{{Sample s1 = Sample.newBuilder()}}
{{ .setPrice(BigDecimal.valueOf(42.32))}}
{{ .setId("A12345")}}
{{ .build();}}
{{Sample s2 = serializer.copy(s1);}}
The AVRO SpecificRecord is generated using avro-maven-plugin from this IDL:
{{@namespace("example.avro")}}
{{protocol SampleProtocol {}}
{{ record Sample{}}
{{ string id;}}
{{ decimal(9,2) price;}}
{{ timestamp_ms eventTime;}}
{{ }}}
{{}}}
The deepCopy of the record happens behind the scenes when attaching an AssignerWithPeriodicWatermark to a Kafka Source consuming AVRO SpecificRecord and using Confluent Schema Registry. The assigned extracts the event time from the record and enabling bookmarking (not sure whether this is related)
A simplified version of the application is [here|[
https://github.com/nicusX/flink-avro-bug|
https://github.com/nicusX/flink-avro-bug/blob/master/src/main/java/example/StreamJob.java]].
The problem looks similar to AVRO-1895 but that issue has been fixed since AVRO 1.8.2 (I'm using AVRO 1.9.2)
In fact, the following code doing deepCopy and only relying on AVRO does work:
{{Sample s1 = Sample.newBuilder()}}
{{ .setPrice(BigDecimal.valueOf(42.32))}}
{{ .setId("A12345")}}
{{ .build();}}
{{Sample s2 = Sample.newBuilder(s1).build();}}
A simplified version of the Flink application causing the problem is [here|[
https://github.com/nicusX/flink-avro-bug/blob/master/src/main/java/example/StreamJob.java]].
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