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After client receives MetadataResponse from a broker, it compares the controller_epoch and controller_metadata_epoch of the currently cached metadata with those of the incoming MetadataResponse. It the controller_epoch of the incoming MetadataResponse, or if the controller_epoch is the same but the controller_metadata_epoch of the incoming MetadataResponse is response, client will If (newMetadataResponse.controller_epoch > existingMetadata.controller_epoch || ( newMetadataResponse.controller_epoch == existingMetadata.controller_epoch && newMetadataResponse.controller_metadata_epoch >= existingMetadata.controller_metadata_epoch)), then the client accepts this newMetadataResponse. Otherwise, the client rejects this newMetadataResponse and refresh metadata again with the existing retry procedure.

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