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• Support using --partitions options to specify a smaller number than current partitions
• Add --deleteNow option delete-partitions-delay option (Long) to specify that when the data should be deleted right away. The default behavior is to delete after retention period passesvalue is 0 meaning the partition should be deleted right away.

./kafka-topics.sh --alter --topic ... --partitions ...　--delete-partitions-immediateDeletePartitiondelay ...

• The command will might issue warning when a topic contains keyed messageunder certain situations, such as
  • "WARNING: If partitions are increased for a topic that has a key, the partition logic or ordering of the messages will be affected"
  • "WARNING: This feature is only enabled with Metadata version above 10 and delete.topic.partition.enable turned on"
  • "WARNING: The topic is currently under changes"

Proposed Changes

We propose to add new status for a partition that indicates if a partition is to be removed. Specifically at any time a partition can be 

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