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https://issues.apache.org/jira/browse/FLINK-5039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15722448#comment-15722448
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Stephan Ewen commented on FLINK-5039:
-------------------------------------
[~bruno] True, we need to change it such that the Avro Serializer is used for
Avro Types.
The tricky part is that we cannot simply swap serializers, since that breaks
the savepoint compatibility.
We are introducing versioning information into the savepoints in the next
release. That allows us to add a "state upgrade" path in which we can swap
serializers without breaking safepoints.
> Avro GenericRecord support is broken
> ------------------------------------
>
> Key: FLINK-5039
> URL: https://issues.apache.org/jira/browse/FLINK-5039
> Project: Flink
> Issue Type: Bug
> Components: Batch Connectors and Input/Output Formats
> Affects Versions: 1.1.3
> Reporter: Bruno Dumon
> Priority: Blocker
> Fix For: 1.2.0, 1.1.4
>
>
> Avro GenericRecord support was introduced in FLINK-3691, but it seems like
> the GenericRecords are not properly (de)serialized.
> This can be easily seen with a program like this:
> {noformat}
> env.createInput(new AvroInputFormat<>(new Path("somefile.avro"),
> GenericRecord.class))
> .first(10)
> .print();
> {noformat}
> which will print records in which all fields have the same value:
> {noformat}
> {"foo": 1478628723066, "bar": 1478628723066, "baz": 1478628723066, ...}
> {"foo": 1478628723179, "bar": 1478628723179, "baz": 1478628723179, ...}
> {noformat}
> If I'm not mistaken, the AvroInputFormat does essentially
> TypeExtractor.getForClass(GenericRecord.class), but GenericRecords are not
> POJOs.
> Furthermore, each GenericRecord contains a pointer to the record schema. I
> guess the current naive approach will serialize this schema with each record,
> which is quite inefficient (the schema is typically more complex and much
> larger than the data). We probably need a TypeInformation and TypeSerializer
> specific to Avro GenericRecords, which could just use avro serialization.
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