grpc.max_metadata_size

[aa...@dropbox.com]

Hi,

Had 2 questions regarding using "grpc.max_metadata_size"

1. It was not clear to me that `max_metadata_size` takes into account size of "detail" part of response. Can we allow setting "max_metadata_size" to -1 to represent unlimited as with `max_send_message_length` and `max_receive_message_length`? 

The exception that gets raised (at least from python) when you try and return with details larger then `max_metadata_size` is `(StatusCode.RESOURCE_EXHAUSTED, to-be-sent trailing metadata size exceeds peer limit` which imo is somewhat confusing as I didn't consider "details" to be trailing metadata, and it does not show up under the response call trailing metadata.

2. Is the equivalent of "max_metadata_size" exposed anywhere in grpc-go? As far as I can tell Java does expose it through netty params `maxHeaderListSize`.

Thanks,

Ashwin

[Doug Fawley]

For #2, Go does not expose or respect any max header size settings.  We do have an issue to start respecting the http2 setting:

https://github.com/grpc/grpc-go/issues/1291

[Mark D. Roth]

The max metadata size translates to the HTTP/2 MAX_HEADER_LIST_SIZE setting, defined in https://tools.ietf.org/html/rfc7540#section-6.5.2.  Since the status details are sent as part of trailing metadata, they count toward this size limit.

The HTTP/2 settings value needs to fit in 32 bits, so the closest you can come to setting it to unlimited is to set it to INT32_MAX.

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Mark D. Roth <ro...@google.com>
Software Engineer
Google, Inc.