Koji Kawamura created NIFI-4008:
-----------------------------------
Summary: ConsumeKafkaRecord_0_10 assumes there is always one
Record in a message
Key: NIFI-4008
URL: https://issues.apache.org/jira/browse/NIFI-4008
Project: Apache NiFi
Issue Type: Bug
Components: Extensions
Affects Versions: 1.2.0
Reporter: Koji Kawamura
ConsumeKafkaRecord_0_10 uses ConsumerLease underneath, and it [assumes there is
one Record available in a consumed
message|https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-0-10-processors/src/main/java/org/apache/nifi/processors/kafka/pubsub/ConsumerLease.java#L434]
retrieved from a Kafka topic.
But in fact, a message can contain 0 or more records in it. For example, with a
record schema shown below:
{code}
{
"type": "record",
"name": "temp",
"fields" : [
{"name": "value", "type": "string"}
]
}
{code}
Multiple records can be sent within a single message, e.g. using JSON:
{code}
[{"value": "a"}, {"value": "b"}, {"value": "c"}]
{code}
But ConsumeKafkaRecord only outputs the first record '[{"value": "a"}]'.
Also, if a message doesn't contain any record in it, the processor fails with
NullPointerException.
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