Github user tzulitai commented on a diff in the pull request:
https://github.com/apache/flink/pull/2509#discussion_r101051346
--- Diff:
flink-connectors/flink-connector-kafka-0.10/src/test/java/org/apache/flink/streaming/connectors/kafka/KafkaTestEnvironmentImpl.java
---
@@ -229,6 +231,8 @@ public void prepare(int numKafkaServers, Properties
additionalServerProperties,
standardProps.setProperty("zookeeper.connect",
zookeeperConnectionString);
standardProps.setProperty("bootstrap.servers",
brokerConnectionString);
standardProps.setProperty("group.id", "flink-tests");
+ standardProps.setProperty("key.deserializer",
"org.apache.kafka.common.serialization.ByteArrayDeserializer");
+ standardProps.setProperty("value.deserializer",
"org.apache.kafka.common.serialization.ByteArrayDeserializer");
--- End diff --
Somehow, without these settings, the new tests that test `setStartFromXXXX`
methods will fail by complaining the property config does not specify settings
for the deserializers.
I guess it is because in those tests, we have Kafka clients that are used
*only* for offset committing and fetching, in which case the client cannot
infer the types to use for the serializers?
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