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https://issues.apache.org/jira/browse/KAFKA-9527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17278285#comment-17278285
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Marco Lotz edited comment on KAFKA-9527 at 2/3/21, 6:34 PM:
------------------------------------------------------------
[~mjsax] I see your point. Indeed in this scenario makes more sense to notify
the user about it.
The bug is caused because of this line
[here|https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java#L516]
- that returns by default a null value on the map.
The following method
{code:java}
client.seek(topicPartition,
topicPartitionsAndOffset.get(topicPartition).offset());{code}
uses it as an argument call without optional handling - which indeed causes a
NPE for keys with null values on the map.
[~jbfletch] it think it should be straight forward to fix, do you mind if I
assign the bug to me?
was (Author: marcolotz):
[~mjsax] I see your point. Indeed in this scenario makes more sense to notify
the user about it.
The bug is caused because of this line
[here|https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java#L516]
- that returns by default a null value on the map.
The following method
```java
client.seek(topicPartition,
topicPartitionsAndOffset.get(topicPartition).offset());
```
uses it as an argument call without optional handling - which indeed causes a
NPE for keys with null values on the map.
[~jbfletch] it think it should be straight forward to fix, do you mind if I
assign the bug to me?
> Application Reset Tool Returns NPE when --to-timestamp or --by-duration are
> run on --input-topics with empty partitions
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-9527
> URL: https://issues.apache.org/jira/browse/KAFKA-9527
> Project: Kafka
> Issue Type: Bug
> Components: streams, tools
> Affects Versions: 2.3.0
> Reporter: jbfletch
> Assignee: jbfletch
> Priority: Minor
>
> When running the streams application reset tool with --by-duration or
> --to-timestamp if any partitions for a given input topic are empty a NPE is
> thrown. I tested this with a topic with 3 partitions, I received a NPE until
> all 3 partitions had at least one message. The behavior was the same for
> both --to-timestamp and --by-duration.
> Error below:
> Reset-offsets for input topics [sample-cdc-topic]Reset-offsets for input
> topics [sample-cdc-topic]Following input topics offsets will be reset to (for
> consumer group des-demo-stream)ERROR:
> java.lang.NullPointerExceptionjava.lang.NullPointerException at
> kafka.tools.StreamsResetter.resetToDatetime(StreamsResetter.java:496) at
> kafka.tools.StreamsResetter.maybeReset(StreamsResetter.java:426) at
> kafka.tools.StreamsResetter.maybeResetInputAndSeekToEndIntermediateTopicOffsets(StreamsResetter.java:374)
> at kafka.tools.StreamsResetter.run(StreamsResetter.java:164) at
> kafka.tools.StreamsResetter.run(StreamsResetter.java:131) at
> kafka.tools.StreamsResetter.main(StreamsResetter.java:678)
>
>
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