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https://issues.apache.org/jira/browse/KAFKA-5047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963145#comment-15963145
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ASF GitHub Bot commented on KAFKA-5047:
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GitHub user dguy opened a pull request:
https://github.com/apache/kafka/pull/2834
KAFKA-5047: NullPointerException while using GlobalKTable in KafkaStreams
Skip null keys when initializing GlobalKTables. This is inline with what
happens during normal processing.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dguy/kafka kafka-5047
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/2834.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2834
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commit ada137175167e4d342056d658402e56d04cc1b6f
Author: Damian Guy <[email protected]>
Date: 2017-04-10T16:44:14Z
skip null keys when restoring global state
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> NullPointerException while using GlobalKTable in KafkaStreams
> -------------------------------------------------------------
>
> Key: KAFKA-5047
> URL: https://issues.apache.org/jira/browse/KAFKA-5047
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Ivan Ursul
> Assignee: Damian Guy
>
> Main.java : https://gist.github.com/ivanursul/dcd4bb382c05843606a96417561b4b31
> pom.xml : https://gist.github.com/ivanursul/25baebc584e57c1fa200335f2cd21b43
> Logs: https://gist.github.com/ivanursul/4d023c783a80ea745f6ebade88c6b810
> WordsWithCountsTopic messages:
> https://gist.github.com/ivanursul/42b2312055ab200bd4bba1d4cab5791a
> I use kafka_2.10-0.10.2.0 downloaded from official website.
> Am I doing something wrong here ? I tried to follow this example:
> https://github.com/confluentinc/examples/blob/3.2.x/kafka-streams/src/main/java/io/confluent/examples/streams/GlobalKTablesExample.java
> Most probably, the problem is because there are missing keys for some
> messages:
> https://gist.github.com/ivanursul/87949fd35b67c6a7b22ceef7af72ea1c
> https://gist.github.com/ivanursul/366689aed57ee9d861846dcf4ccdae7c
> So, to finalize, the problem is that I mistakenly choose a wrong topic for a
> raw text lines and put them to another topic, which should have keys and
> which was connected to GlobalKTable. Since there were nulls, GlobalKTable
> failed to initialize. It would be nice if Kafka can send a warning, that
> partition contains messages with null keys.
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