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https://issues.apache.org/jira/browse/FLINK-29324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17607280#comment-17607280
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Danny Cranmer commented on FLINK-29324:
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Thanks for the contribution [~xiaohei]
> 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: 1.14.5, 1.15.2
> Reporter: Anthony Pounds-Cornish
> Assignee: Dongming.Hu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.16.0, 1.17.0, 1.15.3
>
>
> 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].
> A suggested fix is 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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