#1234 do service check when Milvus startup (#1404)

* #1234 do service check when Milvus startup
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

* #1234 update error log
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

CHANGELOG.md

@@ -54,6 +54,7 @@ Please mark all change in change log and use the issue from GitHub
 - \#1078 - Move 'insert_buffer_size' to Cache Config section
 - \#1105 - Error message is not clear when creating IVFSQ8H index without gpu resources
 - \#740, #849, #878, #972, #1033, #1161, #1173, #1199, #1190, #1223, #1222, #1257, #1264, #1269, #1164, #1303, #1304, #1324, #1388 - Various fixes and improvements for Milvus documentation.
+- \#1234 - Do S3 server validation check when Milvus startup
 - \#1263 - Allow system conf modifiable and some take effect directly
 - \#1320 - Remove debug logging from faiss
 

core/src/server/Server.cpp

@@ -196,8 +196,7 @@ Server::Start() {
         server::Metrics::GetInstance().Init();
         server::SystemInfo::GetInstance().Init();
 
-        StartService();
-        return Status::OK();
+        return StartService();
     } catch (std::exception& ex) {
         std::string str = "Milvus server encounter exception: " + std::string(ex.what());
         return Status(SERVER_UNEXPECTED_ERROR, str);
@@ -253,14 +252,36 @@ Server::LoadConfig() {
     return milvus::Status::OK();
 }
 
-void
+Status
 Server::StartService() {
-    engine::KnowhereResource::Initialize();
+    Status stat;
+    stat = engine::KnowhereResource::Initialize();
+    if (!stat.ok()) {
+        SERVER_LOG_ERROR << "KnowhereResource initialize fail: " << stat.message();
+        goto FAIL;
+    }
+
     scheduler::StartSchedulerService();
-    DBWrapper::GetInstance().StartService();
+
+    stat = DBWrapper::GetInstance().StartService();
+    if (!stat.ok()) {
+        SERVER_LOG_ERROR << "DBWrapper start service fail: " << stat.message();
+        goto FAIL;
+    }
+
     grpc::GrpcServer::GetInstance().Start();
     web::WebServer::GetInstance().Start();
-    storage::S3ClientWrapper::GetInstance().StartService();
+
+    stat = storage::S3ClientWrapper::GetInstance().StartService();
+    if (!stat.ok()) {
+        SERVER_LOG_ERROR << "S3Client start service fail: " << stat.message();
+        goto FAIL;
+    }
+
+    return Status::OK();
+FAIL:
+    std::cerr << "Milvus initializes fail: " << stat.message() << std::endl;
+    return stat;
 }
 
 void

core/src/server/Server.h

@@ -41,7 +41,7 @@ class Server {
     Status
     LoadConfig();
 
-    void
+    Status
     StartService();
     void
     StopService();

core/src/storage/s3/S3ClientWrapper.cpp

@@ -64,7 +64,10 @@ S3ClientWrapper::StartService() {
         client_ptr_ = std::make_shared<S3ClientMock>();
     }
 
-    return CreateBucket();
+    std::cout << "S3 service connection check ...... " << std::flush;
+    Status stat = CreateBucket();
+    std::cout << (stat.ok() ? "OK" : "FAIL") << std::endl;
+    return stat;
 }
 
 void