[jira] [Created] (FLINK-29324) Calling Kinesis connector close method before subtask starts running results in NPE

["Anthony Pounds-Cornish (Jira)" <ji...@apache.org>]

Anthony Pounds-Cornish created FLINK-29324:
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             Summary: Calling Kinesis connector close method before subtask starts running results in NPE
                 Key: FLINK-29324
                 URL: https://issues.apache.org/jira/browse/FLINK-29324
             Project: Flink
          Issue Type: Bug
          Components: Connectors / Kinesis
    Affects Versions: 1.15.2
            Reporter: Anthony Pounds-Cornish


When a Flink application is stopped before a Kinesis connector subtask has been started, the following exception is thrown:
{noformat}
java.lang.NullPointerException
at org.apache.flink.streaming.connectors.kinesis.FlinkKinesisConsumer.close(FlinkKinesisConsumer.java:421)
...{noformat}
This appears to be related to the fact that [fetcher creation|https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/FlinkKinesisConsumer.java#L307] may not occur by [the time it is referenced when the consumer is closed|https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/FlinkKinesisConsumer.java#L421].

The fix should be to make the {{close()}} method null safe [as it has been in the {{cancel()}} method|https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/FlinkKinesisConsumer.java#L407].



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