fix: Configure gRPC keep alive as 120 sec (#2445)

* fix: Configure gRPC keep alive as 120 sec

* test cases

Author: surbhigarg92

src/index.ts

@@ -417,8 +417,7 @@ class Spanner extends GrpcService {
         libVersion: require('../../package.json').version,
         scopes,
         // Add grpc keep alive setting
-        'grpc.keepalive_time_ms': 30000,
-        'grpc.keepalive_timeout_ms': 10000,
+        'grpc.keepalive_time_ms': 120000,
         // Enable grpc-gcp support
         'grpc.callInvocationTransformer': grpcGcp.gcpCallInvocationTransformer,
         'grpc.channelFactoryOverride': grpcGcp.gcpChannelFactoryOverride,

test/index.ts

@@ -228,8 +228,7 @@ describe('Spanner', () => {
       libVersion: require('../../package.json').version,
       scopes: [],
       grpc,
-      'grpc.keepalive_time_ms': 30000,
-      'grpc.keepalive_timeout_ms': 10000,
+      'grpc.keepalive_time_ms': 120000,
       'grpc.callInvocationTransformer':
         fakeGrpcGcp().gcpCallInvocationTransformer,
       'grpc.channelFactoryOverride': fakeGrpcGcp().gcpChannelFactoryOverride,