[C++ SDK] Enabled gRPC keep alive by default (#20731)

Author: Gazizonoki

.github/last_commit.txt

@@ -1 +1 @@
-9184024c04c9a6f9cc079ebaea346ac89bc37aac
+ca39c1dc5e3592adab111f61e4aaec2021bfa95b

include/ydb-cpp-sdk/client/driver/driver.h

@@ -89,13 +89,12 @@ class TDriverConfig {
     //! Params is a optionally field to set policy settings
     //! default: EBalancingPolicy::UsePreferableLocation
     TDriverConfig& SetBalancingPolicy(EBalancingPolicy policy, const std::string& params = std::string());
-    //! !!! EXPERIMENTAL !!!
     //! Set grpc level keep alive. If keepalive ping was delayed more than given timeout
     //! internal grpc routine fails request with TRANSIENT_FAILURE or TRANSPORT_UNAVAILABLE error
     //! Note: this timeout should not be too small to prevent fail due to
     //! network buffers delay. I.e. values less than 5 seconds may cause request failure
     //! even with fast network
-    //! default: disabled
+    //! default: enabled, 10 seconds
     TDriverConfig& SetGRpcKeepAliveTimeout(TDuration timeout);
     TDriverConfig& SetGRpcKeepAlivePermitWithoutCalls(bool permitWithoutCalls);
     //! Set inactive socket timeout.

src/client/driver/driver.cpp

@@ -70,8 +70,8 @@ class TDriverConfig::TImpl : public IConnectionsParams {
         };
     bool DrainOnDtors = true;
     TBalancingSettings BalancingSettings = TBalancingSettings{EBalancingPolicy::UsePreferableLocation, std::string()};
-    TDuration GRpcKeepAliveTimeout;
-    bool GRpcKeepAlivePermitWithoutCalls = false;
+    TDuration GRpcKeepAliveTimeout = TDuration::Seconds(10);
+    bool GRpcKeepAlivePermitWithoutCalls = true;
     TDuration SocketIdleTimeout = TDuration::Minutes(6);
     uint64_t MemoryQuota = 0;
     uint64_t MaxInboundMessageSize = 0;