Thanks for your response, maybe my environment has some problem, I will
study it .
在 2017年8月11日星期五 UTC+8下午11:00:10，Mark D. Roth写道：
>
> It works fine for me when building from master:
>
> D0811 07:57:48.380480115 16947 simple_request.c:116]
> client_peer_before_call=dns://127.0.0.1:1234/foo.com.:23164
> D0811 07:57:48.380498101 16947 dns_resolver_ares.c:304] dns_ares_next
> is called.
> D0811 07:57:48.380896092 16947 grpc_ares_ev_driver_posix.c:116]
> grpc_ares_ev_driver_create
> I0811 07:57:48.380908935 16947 grpc_ares_wrapper.c:375] Using DNS
> server 127.0.0.1:1234
> D0811 07:57:48.381079580 16947 grpc_ares_ev_driver_posix.c:255] new fd: 8
> D0811 07:57:48.381092125 16947 grpc_ares_ev_driver_posix.c:82] Ref
> ev_driver 35859312
> D0811 07:57:48.381097921 16947 grpc_ares_ev_driver_posix.c:277] notify
> read on: 8
> D0811 07:57:48.381121499 16947 grpc_ares_ev_driver_posix.c:187] readable
> on 8
> D0811 07:57:48.381155057 16947 grpc_ares_wrapper.c:202] c-ares
> resolver gets a AF_INET result:
> addr: 127.0.0.1
> port: 23164
>
> D0811 07:57:48.381171851 16947 grpc_ares_wrapper.c:230]
> on_query_srv_done_cb
> D0811 07:57:48.381183455 16947 grpc_ares_wrapper.c:275] on_txt_done_cb
> I0811 07:57:48.381193330 16947 grpc_ares_wrapper.c:308] found service
> config: [{"serviceConfig":{"loadBalancingPolicy":"round_robin"}}]
> I0811 07:57:48.381209488 16947 dns_resolver_ares.c:248] selected
> service config choice: {"loadBalancingPolicy":"round_robin"}
> D0811 07:57:48.381220558 16947 dns_resolver_ares.c:338]
> dns_ares_maybe_finish_next_locked
> D0811 07:57:48.381254825 16947 dns_resolver_ares.c:304] dns_ares_next
> is called.
> D0811 07:57:48.381329568 16947 grpc_ares_ev_driver_posix.c:88] Unref
> ev_driver 35859312
> D0811 07:57:48.381345965 16947 grpc_ares_ev_driver_posix.c:99] delete
> fd: 8
> D0811 07:57:48.381357034 16947 grpc_ares_ev_driver_posix.c:308] ev
> driver stop working
> D0811 07:57:48.381363065 16947 grpc_ares_ev_driver_posix.c:88] Unref
> ev_driver 35859312
> D0811 07:57:48.381367935 16947 grpc_ares_ev_driver_posix.c:90] destroy
> ev_driver 35859312
>
>
> On Thu, Aug 10, 2017 at 11:15 PM, 谭锦彪 <miren...@gmail.com <javascript:>>
> wrote:
>
>> Thank you so much for your response.
>> Follow you suggest, I got this:
>> D0811 14:07:29.205003940 20324 dns_resolver_ares.c:209]
>> dns_ares_next is called.
>> D0811 14:07:29.205322437 20324 grpc_ares_ev_driver_posix.c:127]
>> grpc_ares_ev_driver_create
>> I0811 14:07:29.205340232 20324 grpc_ares_wrapper.c:249] Using DNS
>> server 127.0.0.1:8600
>>
>> and a coredump too, here is the call stack:
>> #0 0x0000000000000000 in ?? ()
>> #1 0x0000000000461e3b in FileLinePrinter (fd=11, pc=0x3717207faf
>> <ares_set_servers_ports+79>, out=0x2b41a3dfe3b0 "\b", out_size=1024,
>> relocation=236611174400)
>> at base/stacktrace_utils.cpp:42
>> #2 0x00002b41a2470485 in google::SymbolizeAndDemangle (pc=0x3717207faf
>> <ares_set_servers_ports+79>, out=0x2b41a3dfe3b0 "\b", out_size=1024) at
>> src/symbolize.cc:611
>> #3 0x00002b41a2470835 in google::(anonymous
>> namespace)::DumpStackFrameInfo (prefix=0x2b41a24725f6 "PC: ",
>> pc=0x3717207fb0 <ares_set_servers_ports+80>)
>> at src/signalhandler.cc:220
>> #4 0x00002b41a2470dbf in google::(anonymous
>> namespace)::FailureSignalHandler (signal_number=11,
>> signal_info=0x2b41a3dfeb70, ucontext=<optimized out>)
>> at src/signalhandler.cc:300
>> #5 <signal handler called>
>> #6 0x0000003717207fb0 in ares_set_servers_ports () from
>> /usr/lib64/libcares.so.2
>> #7 0x00002b41a297d0cf in grpc_dns_lookup_ares () from
>> /usr/lib64/libgrpc.so.4
>> #8 0x00002b41a297bd66 in ?? () from /usr/lib64/libgrpc.so.4
>> #9 0x00002b41a296ca4c in ?? () from /usr/lib64/libgrpc.so.4
>> #10 0x00002b41a296cd3d in ?? () from /usr/lib64/libgrpc.so.4
>> #11 0x00002b41a296d091 in ?? () from /usr/lib64/libgrpc.so.4
>> #12 0x00002b41a29123ec in grpc_combiner_continue_exec_ctx () from
>> /usr/lib64/libgrpc.so.4
>> #13 0x00002b41a2920f48 in grpc_exec_ctx_flush () from
>> /usr/lib64/libgrpc.so.4
>> #14 0x00002b41a29358cf in grpc_call_start_batch () from
>> /usr/lib64/libgrpc.so.4
>> #15 0x00002b41a26b17ec in
>> grpc::Channel::PerformOpsOnCall(grpc::CallOpSetInterface*, grpc::Call*) ()
>> from /usr/lib64/libgrpc++.so.1
>> #16 0x00000000004551eb in grpc::Call::PerformOps (this=0x2b41a405fda8,
>> ops=0x2b41a405fdc8) at /usr/local/include/grpc++/impl/codegen/call.h:655
>> #17 0x00000000004f1414 in
>> grpc::ClientAsyncResponseReader<helloworld::HelloReply>::ClientAsyncResponseReader<helloworld::HelloRequest>
>>
>> (this=0x2b41a405fd98,
>> call=..., context=0x2b41a40481e0, request=...) at
>> /usr/local/include/grpc++/impl/codegen/async_unary_call.h:152
>> #18 0x00000000004f01f3 in
>> grpc::ClientAsyncResponseReader<helloworld::HelloReply>::Create<helloworld::HelloRequest>
>>
>> (channel=0x2b41a4010d00, cq=0x2b41a3dffa88,
>> method=..., context=0x2b41a40481e0, request=...) at
>> /usr/local/include/grpc++/impl/codegen/async_unary_call.h:102
>> #19 0x00000000004ec390 in helloworld::Greeter::Stub::AsyncSayHelloRaw
>> (this=0x2b41a400f100, context=0x2b41a40481e0, request=...,
>> cq=0x2b41a3dffa88)
>> at build64_debug/ads/serving/grpc_lb_demo/helloworld.grpc.pb.cc:36
>> #20 0x0000000000455684 in helloworld::Greeter::Stub::AsyncSayHello
>> (this=0x2b41a400f100, context=0x2b41a40481e0, request=...,
>> cq=0x2b41a3dffa88)
>> at build64_debug/ads/serving/grpc_lb_demo/helloworld.grpc.pb.h:51
>> #21 0x000000000045332f in (anonymous namespace)::GreeterClient::SayHello
>> (this=0x2b41a3dffa80, user=...) at
>> ads/serving/grpc_lb_demo/greeter_async_client2.cc:58
>> #22 0x000000000045373f in (anonymous namespace)::SendRequest
>> (loop=0x2b41a38c3000) at
>> ads/serving/grpc_lb_demo/greeter_async_client2.cc:163
>> #23 0x000000000045798e in std::_Bind_simple<void
>> (*(ev_loop*))(ev_loop*)>::_M_invoke<0ul>(std::_Index_tuple<0ul>)
>> (this=0x2b41a38c1eb0)
>> at /usr/local/gcc4.8.2/include/c++/4.8.2/functional:1732
>> #24 0x000000000045788f in std::_Bind_simple<void
>> (*(ev_loop*))(ev_loop*)>::operator()() (this=0x2b41a38c1eb0) at
>> /usr/local/gcc4.8.2/include/c++/4.8.2/functional:1720
>> #25 0x0000000000457828 in std::thread::_Impl<std::_Bind_simple<void
>> (*(ev_loop*))(ev_loop*)> >::_M_run() (this=0x2b41a38c1e98)
>> at /usr/local/gcc4.8.2/include/c++/4.8.2/thread:115
>> #26 0x0000000000515010 in std::(anonymous
>> namespace)::execute_native_thread_routine (__p=<optimized out>) at
>> ../../../.././libstdc++-v3/src/c++11/thread.cc:84
>> #27 0x0000003254007aa1 in start_thread () from /lib64/libpthread.so.0
>> ---Type <return> to continue, or q <return> to quit---
>> #28 0x0000003253ce893d in clone () from /lib64/libc.so.6
>>
>> It works good when not use authority, so have you tested this function?
>> My enviroment is grpc 1.4.1 and c-ares 1.13.0
>>
>> 在 2017年8月8日星期二 UTC+8下午10:39:42，Mark D. Roth写道：
>>>
>>> The feature you're asking about actually has nothing to do with
>>> supporting grpclb in DNS; it's actually about how to use an alternative DNS
>>> server for testing.
>>>
>>> I originally added support for specifying an alternative DNS server by
>>> IP address (not hostname) to the c-ares DNS resolver implementation in
>>> https://github.com/grpc/grpc/pull/10706, although there was a bug that
>>> prevented it from working, which I fixed in
>>> https://github.com/grpc/grpc/pull/11954. If your build includes those
>>> PRs, then you should be able to use the c-ares resolver with an alternative
>>> DNS server specified as an IP address.
>>>
>>> Note that the c-ares resolver is not currently the default DNS resolver;
>>> to enable it, you need to run with the environment variable
>>> GRPC_DNS_RESOLVER=ares. There are still a few features missing from the
>>> c-ares DNS resolver (such as CNAME resolution and address sorting), which
>>> is why it's not yet the default, but we're working to fix that.
>>>
>>> On Tue, Aug 8, 2017 at 2:02 AM, 谭锦彪 <miren...@gmail.com> wrote:
>>>
>>>> Hi,Roth.
>>>>
>>>> I got "dns_resolver.c:252] authority based dns uri's not
>>>> supported", when use dns like below:
>>>> ChannelArguments args;
>>>> args.SetLoadBalancingPolicyName("round_robin");
>>>> GreeterClient greeter(grpc::CreateCustomChannel(
>>>> "dns://localhost:8600/sag_test_grpc.service.consul-dev.",
>>>>
>>>>
>>>>
>>>> grpc::InsecureChannelCredentials(), args));
>>>>
>>>> So What's your plan to supports this?
>>>>
>>>> 在 2017年2月1日星期三 UTC+8上午2:30:04，Mark D. Roth写道：
>>>>>
>>>>> I've put together the following gRFC for encoding grpclb data in DNS:
>>>>>
>>>>> https://github.com/grpc/proposal/pull/10
>>>>>
>>>>> As per the gRFC process, please keep discussion in this thread. All
>>>>> comments welcome.
>>>>>
>>>>> Thanks!
>>>>>
>>>>> --
>>>>> Mark D. Roth <ro...@google.com>
>>>>> Software Engineer
>>>>> Google, Inc.
>>>>>
>>>> --
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>>>>
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>>>>
>>>
>>>
>>>
>>> --
>>> Mark D. Roth <ro...@google.com>
>>> Software Engineer
>>> Google, Inc.
>>>
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>
>
>
> --
> Mark D. Roth <ro...@google.com <javascript:>>
> Software Engineer
> Google, Inc.
>
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