Are you using gRPC installed via homebrew or is it bundled with
something else? Usually package maintainers like homebrew will
dynamically link to the system versions of dependencies so they can be
updated independently. You might be able to run otool -L on grpc to see
what c-ares library its picking up (and if none are listed, it might be
compiled in statically).
That said, according to your grpc logs, it appears that grpc may be
itself performing both A and AAAA queries and expect responses to both
of those. I see the "A" reply comes back but the "AAAA" reply never
comes and it bails at that point. Many years ago c-ares didn't have a
way to request both A and AAAA records with one query, but does these
days via ares_getaddrinfo(), and it was recently enhanced with logic to
assist in the exact scenario you are seeing, basically it will stop
retrying when at least one address family is returned.
You might need to escalate this to the gRPC folks.
On 1/22/24 12:10 PM, Nicholas Chammas wrote:
Here’s the output of adig and ahost
<https://gist.github.com/nchammas/a4c9873d8158c323796e9b47c064e63a#file-adig-ahost-txt>,
both with and without the DNS servers set directly on the network
interface (vs. just on the router).
I also learned that gRPC 1.60.0 may be using c-ares 1.19.1
<https://github.com/grpc/grpc/tree/v1.60.0/third_party/cares>, though
again that’s just via looking at the gRPC source and not via some
runtime query.
On Jan 21, 2024, at 7:34 AM, Brad House <b...@brad-house.com> wrote:
I think homebrew distributes the 'adig' and 'ahost' utilities from
c-ares. Can you try using those to do the same lookup so we can see
the results?
On 1/19/24 11:01 AM, Nicholas Chammas wrote:
On Jan 17, 2024, at 3:38 PM, Brad House <b...@brad-house.com> wrote:
What version of c-ares is installed?
Sorry about the delay in responding. Answering this question is more
difficult than I expected.
I know that Spark Connect is running gRPC 1.160.0. Looking through
the gRPC repo, I see mention of c-ares 1.13.0
<https://github.com/grpc/grpc/blob/v1.60.0/cmake/cares.cmake#L42>,
but I don’t know how that translates to my runtime. Homebrew tells
me I have c-ares 1.25.0 installed, but again, I’m not sure if that’s
what I’m actually running.
Is there a way I can directly query the version of c-ares being run
via Spark Connect / gRPC? I asked this question on the gRPC forum
<https://groups.google.com/g/grpc-io/c/3tZCa48Xvh8> but no response yet.
For the record, I know that c-ares is involved because if I tell
gRPC to not use it (via GRPC_DNS_RESOLVER=native
<https://github.com/grpc/grpc/blob/b34d98fbd47834845e3f9cdaa4aa706f1aa4eddb/doc/environment_variables.md>)
then my problem disappears.
What DNS servers are configured on your MacOS system when its not
operating properly? The output of "scutil --dns" would be helpful
here.
Here’s that output.
<https://gist.github.com/nchammas/a4c9873d8158c323796e9b47c064e63a#file-scutil-dns-txt> I
believe 192.168.1.1 is just my local router, and on there is where I
have the default DNS servers set to 1.1.1.1 and 1.0.0.1.
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