[jira] [Created] (KAFKA-8838) Allow consumer group tool to work with non-existing consumer groups

["Patrik Kleindl (Jira)" <ji...@apache.org>]

Patrik Kleindl created KAFKA-8838:
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             Summary: Allow consumer group tool to work with non-existing consumer groups
                 Key: KAFKA-8838
                 URL: https://issues.apache.org/jira/browse/KAFKA-8838
             Project: Kafka
          Issue Type: Improvement
          Components: tools
            Reporter: Patrik Kleindl


The streams application reset tool works for non-existing consumer groups and allows to "pre-set" offsets before a new deployment.

The consumer group tool does not allow the same which would be a nice enhancement.

If this should work and the NullPointerException is not expected this can be converted to a bug.

 
{code:java}
./kafka-consumer-groups --bootstrap-server broker:9092 --group applicationId --reset-offsets --by-duration P60D --topic topic1 --executeError: Executing consumer group command failed due to nulljava.lang.NullPointerException at scala.collection.convert.Wrappers$JListWrapper.iterator(Wrappers.scala:88) at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) at scala.collection.AbstractIterable.foreach(Iterable.scala:54) at scala.collection.TraversableLike$class.map(TraversableLike.scala:234) at scala.collection.AbstractTraversable.map(Traversable.scala:104) at kafka.admin.ConsumerGroupCommand$ConsumerGroupService$$anonfun$parseTopicPartitionsToReset$1.apply(ConsumerGroupCommand.scala:477) at kafka.admin.ConsumerGroupCommand$ConsumerGroupService$$anonfun$parseTopicPartitionsToReset$1.apply(ConsumerGroupCommand.scala:471) at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241) at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241) at scala.collection.Iterator$class.foreach(Iterator.scala:891) at scala.collection.AbstractIterator.foreach(Iterator.scala:1334) at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) at scala.collection.AbstractIterable.foreach(Iterable.scala:54) at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241) at scala.collection.AbstractTraversable.flatMap(Traversable.scala:104) at kafka.admin.ConsumerGroupCommand$ConsumerGroupService.parseTopicPartitionsToReset(ConsumerGroupCommand.scala:471) at kafka.admin.ConsumerGroupCommand$ConsumerGroupService.getPartitionsToReset(ConsumerGroupCommand.scala:486) at kafka.admin.ConsumerGroupCommand$ConsumerGroupService.resetOffsets(ConsumerGroupCommand.scala:310) at kafka.admin.ConsumerGroupCommand$.main(ConsumerGroupCommand.scala:64) at kafka.admin.ConsumerGroupCommand.main(ConsumerGroupCommand.scala){code}



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