Hi, everyone!
I'm writing test (with gtest) with grpc similar to the following (in C++
pseudocode):
class Fixture {
void SetUp() { m_server = BuildAndStart(); }
void TearDown() { m_server->Shutdown(); }
};
TEST_F(Fixture, *Test1*) { ASSERT_EQ(clientStub->rpcCall(ctx),
grpc::Status::OK); }
TEST_F(Fixture, Test2) { ASSERT_EQ(clientStub->rpcCall(ctx),
grpc::Status::OK); }
When compiling (clang++11) with a thread sanitizer (grpc library compiling
with tsan too) sometimes I get an error UNAVALABLE (code 14) with logs:
"Failed to pick subchannel", "Failed to connect to all addresses" and
observe the state of the channel is TRANSIENT_FAILURE.
But only the first test always fails (*Test1*). Searching the internet I
found the following suitable solution
https://chromium.googlesource.com/external/github.com/grpc/grpc/+/HEAD/examples/python/wait_for_ready/
In other words, with tsan I guess grpc library does not have enough time to
fully initialize (Test2 is always OK). After use
grpc::ClientContext::set_wait_for_ready(bool) method problem solved
TEST_F(Fixture, Test1) { ASSERT_EQ(clientStub->rpcCall(ctx*WithWait*),
grpc::Status::OK); }
TEST_F(Fixture, Test2) { ASSERT_EQ(clientStub->rpcCall(ctx*WithWait*),
grpc::Status::OK); }
My questions are:
1. grpc::ClientContext::set_wait_for_ready(bool) marked as EXPERIMENTAL
(C++ api) and may be removed in the future, but
grpc::ClientContext::set_fail_fast(bool) method is DEPRECATED. It's
recommended to use wait_for_ready(). Is it true that in the future
set_wait_for_ready should become a replacement set_fail_fast?
2. Are there any other ways to solve this problem? I was also looking at
ChannelState API
https://chromium.googlesource.com/external/github.com/grpc/grpc/+/refs/heads/chromium-deps/2016-09-09/doc/connectivity-semantics-and-api.md
Which
way is more correct and reliable?
I will also need to implement similar logic in C# code. In C# this is a
CallOptions.WithWaitForReady(bool) method, but it's EXPERIMENTAL too
Wished to clear up a misunderstanding and choose the right solution.
Thank you for your time.
Highly appreciated.
Sergey
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