MS-653 fix when config check fail, Milvus close without message

- MS-587 - Count get wrong result after adding vectors and index built immediately

- MS-599 - Search wrong result when table created with metric_type: IP

- MS-601 - Docker logs error caused by get CPUTemperature error

- MS-622 - Delete vectors should be failed if date range is invalid

- MS-620 - Get table row counts display wrong error code

- MS-622 - Delete vectors should be failed if date range is invalid

- MS-624 - Search vectors failed if time ranges long enough

- MS-637 - Out of memory when load too many tasks

- MS-639 - SQ8H index created failed and server hang

- MS-640 - Cache object size calculate incorrect

- MS-641 - Segment fault(signal 11) in PickToLoad

- MS-639 - SQ8H index created failed and server hang

- MS-647 - [monitor] grafana display average cpu-temp

- MS-644 - Search crashed with index-type: flat

- MS-624 - Search vectors failed if time ranges long enough

- MS-647 - [monitor] grafana display average cpu-temp

- MS-652 - IVFSQH quantization double free

- MS-653 - When config check fail, Milvus close without message

## Improvement

- MS-552 - Add and change the easylogging library

- MS-608 - Update TODO names

- MS-609 - Update task construct function

- MS-611 - Add resources validity check in ResourceMgr

- MS-619 - Add optimizer class in scheduler

- MS-614 - Preload table at startup

- MS-619 - Add optimizer class in scheduler

- MS-626 - Refactor DataObj to support cache any type data

- MS-648 - Improve unittest

- MS-600 - Reconstruct unittest code

- MS-602 - Remove zilliz namespace

- MS-610 - Change error code base value from hex to decimal

- MS-635 - Add compile option to support customized faiss

- MS-624 - Re-organize project directory for open-source

- MS-635 - Add compile option to support customized faiss

# Milvus 0.4.0 (2019-09-12)

// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#include "config/ConfigMgr.h"

#include "YamlConfigMgr.h"

namespace milvus {

namespace server {

ConfigMgr*

ConfigMgr::GetInstance() {

    static YamlConfigMgr mgr;

    return &mgr;

}

}  // namespace server

}  // namespace milvus

#pragma once

#include "ConfigNode.h"

#include "utils/Error.h"

#include <string>

#include "ConfigNode.h"

#include "utils/Status.h"

namespace milvus {

namespace server {

// this class can parse nested config file and return config item

// config file example(yaml style)

//       AAA: 1

//       BBB:

//         CCC: hello

//         DDD: 23.5

//

// usage

//   const ConfigMgr* mgr = ConfigMgr::GetInstance();

//   const ConfigNode& node = mgr->GetRootNode();

//   std::string val = node.GetValue("AAA"); // return '1'

//   const ConfigNode& child = node.GetChild("BBB");

//   val = child.GetValue("CCC"); //return 'hello'

class ConfigMgr {

 public:

    static ConfigMgr*

    GetInstance();

    virtual ErrorCode

    virtual Status

    LoadConfigFile(const std::string& filename) = 0;

    virtual void

    Print() const = 0;  // will be deleted

    virtual std::string

    DumpString() const = 0;

    virtual const ConfigNode&

    GetRootNode() const = 0;

    virtual ConfigNode&

    GetRootNode() = 0;

};

#include "config/YamlConfigMgr.h"

#include "utils/Log.h"

#include <sys/stat.h>

namespace milvus {

namespace server {

ErrorCode

Status

YamlConfigMgr::LoadConfigFile(const std::string& filename) {

    struct stat directoryStat;

    int statOK = stat(filename.c_str(), &directoryStat);

    if (statOK != 0) {

        SERVER_LOG_ERROR << "File not found: " << filename;

        return SERVER_UNEXPECTED_ERROR;

    }

    try {

        node_ = YAML::LoadFile(filename);

        LoadConfigNode(node_, config_);

    } catch (YAML::Exception& e) {

        SERVER_LOG_ERROR << "Failed to load config file: " << std::string(e.what());

        return SERVER_UNEXPECTED_ERROR;

        std::string str = "Exception: load config file fail: " + std::string(e.what());

        return Status(SERVER_UNEXPECTED_ERROR, str);

    }

    return SERVER_SUCCESS;

    return Status::OK();

}

void

#pragma once

#include "ConfigMgr.h"

#include "ConfigNode.h"

#include "utils/Error.h"

#include <yaml-cpp/yaml.h>

#include <string>

#include "ConfigMgr.h"

#include "utils/Status.h"

namespace milvus {

namespace server {

class YamlConfigMgr : public ConfigMgr {

 public:

    virtual ErrorCode

    static ConfigMgr*

    GetInstance() {

        static YamlConfigMgr mgr;

        return &mgr;

    }

    virtual Status

    LoadConfigFile(const std::string& filename);

    virtual void

    Print() const;

    virtual std::string

    DumpString() const;

    virtual const ConfigNode&

    GetRootNode() const;

    virtual ConfigNode&

    GetRootNode();