kafka-connector/src/main/java/com/google/pubsub/kafka/source/CloudPubSubGRPCSubscriber.java [93:98]:
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      SubscriberStubSettings subscriberStubSettings =
          SubscriberStubSettings.newBuilder()
              .setTransportChannelProvider(
                  SubscriberStubSettings.defaultGrpcTransportProviderBuilder()
                      .setMaxInboundMessageSize(20 << 20) // 20MB
                      .build())
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kafka-connector/src/main/java/com/google/pubsub/kafka/source/CloudPubSubSourceConnector.java [305:310]:
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      SubscriberStubSettings subscriberStubSettings =
      SubscriberStubSettings.newBuilder()
        .setTransportChannelProvider(
            SubscriberStubSettings.defaultGrpcTransportProviderBuilder()
                .setMaxInboundMessageSize(20 << 20) // 20MB
                .build())
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