[jira] [Created] (FLINK-18276) NullPointerException when closing KafkaConsumer

[Shang Yuanchun (Jira)]

Nico Kruber created FLINK-18276:
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             Summary: NullPointerException when closing KafkaConsumer
                 Key: FLINK-18276
                 URL: https://issues.apache.org/jira/browse/FLINK-18276
             Project: Flink
          Issue Type: Bug
          Components: Connectors / Kafka
    Affects Versions: 1.10.1, 1.9.3, 1.8.3, 1.11.0
            Reporter: Nico Kruber


{code}
WARN  org.apache.flink.streaming.connectors.kafka.internal.KafkaFetcher  - Error while closing Kafka consumer
java.lang.NullPointerException
        at org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerThread.run(KafkaConsumerThread.java:282)
{code}

{{KafkaConsumerThread#reassignPartitions}} is temporarily setting {{consumer}} to {{null}} and if there is an exception (in this case, it was a timeout), the {{finally}} block in {{KafkaConsumerThread.run}} would fail with an NPE. Even more so, {{KafkaConsumerThread#reassignPartitions}} put the original consumer into {{consumerTmp}} which is not closed now and may leak underlying (Kafka) resources.



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