Databricks Community

This is the PR that introduced the configurable limit: https://github.com/apache/spark/pull/40447/files

To add a bit more here I don't even this that the 128MB limit is really a limit. You can set "spark.connect.grpc.maxInboundMessageSize" to a larger value and also override the default limit on the client side by using a custom gRPC ChannelBuilder.