Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/2612#discussion_r82591316 --- Diff: flink-batch-connectors/flink-avro/src/main/java/org/apache/flink/api/java/io/AvroOutputFormat.java --- @@ -36,6 +38,8 @@ private final Class<E> avroValueType; private transient Schema userDefinedSchema = null; + + private transient CodecFactory codecFactory = null; --- End diff -- Flink uses Java Serialization to ship code from the client to the cluster. `CodecFactory` does not implement `Serializable`. Therefore, the `codecFactory` field must be declared as `transient`. However, the `writeObject` and `readObject` methods must be adapted to manually serialize / deserialize the information. Otherwise, the `CodecFactory` is lost when the object is deserialized at the client.
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