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https://issues.apache.org/jira/browse/FLINK-17486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lorenzo Nicora updated FLINK-17486:
-----------------------------------
Labels: AVRO confluent-kafka kafka (was: )
> 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
> Priority: Critical
> Labels: AVRO, confluent-kafka, kafka
>
> 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}}
> I understand the problem arises when Flink tries to make a deep-copy of the
> record for checkpointing.
> This code reproduces the problem
> ([https://github.com/nicusX/flink-avro-bug/blob/master/src/test/java/example/TestDeepCopy.java]):
>
> {code:java}
> AvroSerializer<Sample> serializer = new AvroSerializer<>(Sample.class);
> Sample s1 = Sample.newBuilder()
> .setPrice(BigDecimal.valueOf(42.32))
> .setId("A12345")
> .build();
> Sample s2 = serializer.copy(s1);
> {code}
>
>
> The AVRO SpecificRecord is generated from this IDL (using the
> maven-avro-plugin):
> {code:java}
> @namespace("example.avro")
> protocol SampleProtocol {
> record Sample{
> string id;
> decimal(9,2) price;
> timestamp_ms eventTime;
> }
> }{code}
> In particular, I had the problem after 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/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.
> In fact, the following code does deep-copy only relying on AVRO and does
> work:
> {code:java}
> Sample s1 = Sample.newBuilder()
> .setPrice(BigDecimal.valueOf(42.32))
> .setId("A12345")
> .build();
> Sample s2 = Sample.newBuilder(s1).build();{code}
>
> Code of the two tests and simplified application:
> [https://github.com/nicusX/flink-avro-bug|https://github.com/nicusX/flink-avro-bug/blob/master/src/main/java/example/StreamJob.java]
>
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