Morten Lied Johansen created KAFKA-2268:
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Summary: New producer logs WARN if serializer supplied directly to
constructor
Key: KAFKA-2268
URL: https://issues.apache.org/jira/browse/KAFKA-2268
Project: Kafka
Issue Type: Bug
Components: producer
Affects Versions: 0.8.2.1
Reporter: Morten Lied Johansen
Assignee: Jun Rao
Priority: Trivial
When creating a new KafkaProducer by passing in a configuration-map, a key
serializer and a value serializer, two warnings are logged:
{noformat}
[WARN ] [2015-06-15T14:26:36,271] The configuration value.serializer = class
no.finntech.commons.kafka.ThriftSerializer was supplied but isn't a known
config.
[org.apache.kafka.common.config.AbstractConfig.logUnused(AbstractConfig.java:121)]
[RMI TCP Connection(2)-127.0.0.1]
[WARN ] [2015-06-15T14:26:36,271] The configuration key.serializer = class
org.apache.kafka.common.serialization.StringSerializer was supplied but isn't a
known config.
[org.apache.kafka.common.config.AbstractConfig.logUnused(AbstractConfig.java:121)]
[RMI TCP Connection(2)-127.0.0.1]
{noformat}
This happens because this constructor adds the serializers to the config
(KafkaProducer.java:108), and then ignores that configuration since the
instances are already present (KafkaProducer.java:215). Finally, it checks
which parts of the configuration were used, and logs warnings for the remaining
keys (KafkaProducer.java:230).
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