jihoonson opened a new pull request #8050: Add IS_INCREMENTAL_HANDOFF_SUPPORTED for KIS backward compatibility URL: https://github.com/apache/incubator-druid/pull/8050 ### Description In 0.15.0 or earlier, Kafka index task chooses one of `IncrementalPublishingKafkaIndexTaskRunner` and `LegacyKafkaIndexTaskRunner` depending on the `IS_INCREMENTAL_HANDOFF_SUPPORTED` value in the task context. Since `LegacyKafkaIndexTaskRunner` and the context value have removed in 0.16.0, Kafka index task could choose `LegacyKafkaIndexTaskRunner` if you downgrade the cluster from 0.16.0 to an earlier version. This PR sets `IS_INCREMENTAL_HANDOFF_SUPPORTED` in the context for Kafka index tasks for the compatibility.
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