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This KIP proposes to migrate to incrementalAlterConfigs API for syncing topic configurations in MirrorMaker. The incrementalAlterConfigs API has been around for several years since it was introduced in Kafka 2.3.0 and addresses the shortcoming of the deprecated alterConfigs  API. In order not to break the compatibility, we will introduce a new setting to MirrorMaker to give the option to enable incrementalAlterConfigs API for syncing topic configurations. This new setting is expected to serve as a temporary measure until the next major release when the API is always used. 

It also includes a proposal to add proposes adding the ability to use the target cluster's default for target topic configurations, rather than using the source cluster's default. For instance, users would be able to configure ConfigPropertyFilter to check if the configuration on the source topic is the default and decide whether or not to replicate it to the target topic. 

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