Enable head-based sampling and add some scripts for large scale deployment

This PR is related to the following issues:

• Head based sampling: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/17
• Data type of duration: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/20
• Docker images and scripts for deployment: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/15

Side note, gen_address.py and config/alibaba_parse.py are not used, will be discarded later.

src/tracing/opentelemetry.h

@@ -25,13 +25,9 @@ namespace trace_sdk = opentelemetry::sdk::trace;
 using opentelemetry::sdk::resource::Resource;
 using opentelemetry::trace::TracerProvider;
 
-inline void initStdoutOpenTelemetry() {
-  auto exporter = std::unique_ptr<trace_sdk::SpanExporter>(
-      new opentelemetry::exporter::trace::OStreamSpanExporter);
-  auto processor = std::unique_ptr<trace_sdk::SpanProcessor>(
-      new trace_sdk::SimpleSpanProcessor(std::move(exporter)));
+inline void initNoopOpenTelemetry() {
   auto provider = nostd::shared_ptr<TracerProvider>(
-      new trace_sdk::TracerProvider(std::move(processor)));
+      new opentelemetry::trace::NoopTracerProvider());
 
   // Set the global trace provider
   trace_api::Provider::SetTracerProvider(provider);
@@ -40,30 +36,33 @@ inline void initStdoutOpenTelemetry() {
   initGrpcPropagation();
 }
 
-inline void initNoopOpenTelemetry() {
-  auto provider = nostd::shared_ptr<TracerProvider>(
-      new opentelemetry::trace::NoopTracerProvider());
+inline void initTracer(std::unique_ptr<trace_sdk::SpanExporter>& exporter) {
+  auto processor = std::unique_ptr<trace_sdk::SpanProcessor>(
+      new trace_sdk::SimpleSpanProcessor(std::move(exporter)));
+  std::vector<std::unique_ptr<trace_sdk::SpanProcessor>> processors;
+  processors.push_back(std::move(processor));
+  auto context = std::make_shared<trace_sdk::TracerContext>(
+      std::move(processors), Resource::Create({}),
+      std::unique_ptr<trace_sdk::Sampler>(new trace_sdk::ParentBasedSampler(
+          std::make_shared<trace_sdk::AlwaysOnSampler>())));
+  auto provider = opentelemetry::nostd::shared_ptr<TracerProvider>(
+      new trace_sdk::TracerProvider(context));
 
-  // Set the global trace provider
   trace_api::Provider::SetTracerProvider(provider);
-
   // Set the global propagator
   initGrpcPropagation();
 }
 
+inline void initStdoutOpenTelemetry() {
+  auto exporter = std::unique_ptr<trace_sdk::SpanExporter>(
+      new opentelemetry::exporter::trace::OStreamSpanExporter);
+  initTracer(exporter);
+}
+
 inline void initLocalMemoryOpenTelemetry() {
   auto exporter = std::unique_ptr<trace_sdk::SpanExporter>(
       new opentelemetry::exporter::memory::InMemorySpanExporter);
-  auto processor = std::unique_ptr<trace_sdk::SpanProcessor>(
-      new trace_sdk::SimpleSpanProcessor(std::move(exporter)));
-  auto provider = nostd::shared_ptr<TracerProvider>(
-      new trace_sdk::TracerProvider(std::move(processor)));
-
-  // Set the global trace provider
-  trace_api::Provider::SetTracerProvider(provider);
-
-  // Set the global propagator
-  initGrpcPropagation();
+  initTracer(exporter);
 }
 
 inline void initJaegerOpenTelemetry(std::string exporter_ip,
@@ -75,24 +74,7 @@ inline void initJaegerOpenTelemetry(std::string exporter_ip,
       opentelemetry::exporter::jaeger::TransportFormat::kThriftUdpCompact;
   auto exporter = std::unique_ptr<trace_sdk::SpanExporter>(
       new opentelemetry::exporter::jaeger::JaegerExporter(opts));
-
-  auto processor = std::unique_ptr<trace_sdk::SpanProcessor>(
-      new trace_sdk::SimpleSpanProcessor(std::move(exporter)));
-  std::vector<std::unique_ptr<trace_sdk::SpanProcessor>> processors;
-  processors.push_back(std::move(processor));
-
-  // Default is an always-on sampler.
-  auto context = std::make_shared<trace_sdk::TracerContext>(
-      std::move(processors), Resource::Create({}),
-      std::unique_ptr<trace_sdk::Sampler>(new trace_sdk::ParentBasedSampler(
-          std::make_shared<trace_sdk::AlwaysOnSampler>())));
-  auto provider = opentelemetry::nostd::shared_ptr<TracerProvider>(
-      new trace_sdk::TracerProvider(context));
-  // Set the global trace provider
-  trace_api::Provider::SetTracerProvider(provider);
-
-  // Set the global propagator
-  initGrpcPropagation();
+  initTracer(exporter);
 }
 
 }  // namespace hindsightgrpc