Merge remote-tracking branch 'source/branch-0.5.0' into branch-0.5.0

Former-commit-id: 7bda294e1056269bbdef07c2d8c982d31f49434d

.clang-format

+# 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.
+---
+BasedOnStyle:  Google
+DerivePointerAlignment: false
+ColumnLimit: 90

cpp/CONTRIBUTING.md

@@ -4,7 +4,7 @@ First of all, thanks for taking the time to contribute to Milvus! It's people li
 
 The following are a set of guidelines for contributing to Milvus. Following these guidelines helps contributing to this project easy and transparent. These are mostly guideline, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
 
-As for everything else in the project, the contributions to Milvus are governed by our [Code of Conduct](http://hood.ie/code-of-conduct/).
+As for everything else in the project, the contributions to Milvus are governed by our [Code of Conduct](CODE OF CONDUCT.md).
 
 TOC
 
@@ -36,21 +36,30 @@ The Milvus team members will review your pull requests, and once it is accepted,
 
 Before sending your pull requests for review, make sure your changes are consistent with the guidelines and follow the Milvus coding style.
 
-- Include unit tests when you contribute new features, as they help to a) prove that your code works correctly, and b) guard against future breaking changes to lower the maintenance cost.
-- Bug fixes also generally require unit tests, because the presence of bugs usually indicates insufficient test coverage.
+- Include unit tests when you contribute new features, as they help to prove that your code works correctly, and also guard against future breaking changes to lower the maintenance cost.
+- Bug fixes also require unit tests, because the presence of bugs usually indicates insufficient test coverage.
 - Keep API compatibility in mind when you change code in Milvus. Reviewers of your pull request will comment on any API compatibility issues.
 - When you contribute a new feature to Milvus, the maintenance burden is (by default) transferred to the Milvus team. This means that the benefit of the contribution must be compared against the cost of maintaining the feature.
 
 
 ## Coding Style
+The coding style used in Milvus generally follow [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html).
+And we made the following changes based on the guide:
+
+- 4 spaces for indentation
+- Adopt .cpp file extension instead of .cc extension
+- 120-character line length
+- Camel-Cased file names
 
 
 ## Run unit test
 
+We use Google Test framework for test running.
+To run unit test for Milvus under C++, please use the following command:
+
 ```shell
+# Run unit test for Milvus
 $ ./build.sh -u
-or
-$ ./build.sh --unittest
 ```
 
 

cpp/README.md

+- [Slack Community](https://join.slack.com/t/milvusio/shared_invite/enQtNzY1OTQ0NDI3NjMzLWNmYmM1NmNjOTQ5MGI5NDhhYmRhMGU5M2NhNzhhMDMzY2MzNDdlYjM5ODQ5MmE3ODFlYzU3YjJkNmVlNDQ2ZTk)
+- [Blog](https://www.milvus.io/blog/)
+
 # Welcome to Milvus
 
 Firstly, welcome, and thanks for your interest in [Milvus](https://milvus.io)! No matter who you are, what you do, we greatly appreciate your contribution to help us reinvent data science with Milvus.
@@ -8,9 +11,9 @@ Milvus is an open source vector search engine that supports similarity search of
 
 Milvus was developed by ZILLIZ, a tech startup that intends to reinvent data science, with the purpose of providing enterprises with efficient and scalable similarity search and analysis of feature vectors and unstructured data. 
 
-Milvus provides stable Python and C++ APIs, as well as RESTful API.
+Milvus provides stable Python, C++ and Java APIs.
 
-Keep up-to-date with newest releases and latest updates by reading [Releases](https://www.milvus-io/docs/master/releases).
+Keep up-to-date with newest releases and latest updates by reading Milvus [release notes](https://milvus.io/docs/en/Releases/v0.4.0/).
 
 - GPU-accelerated search engine
 
@@ -33,7 +36,7 @@ Keep up-to-date with newest releases and latest updates by reading [Releases](ht
 
 #### Use Docker
 
-Use Docker to install Milvus is a breeze. See the [Milvus install guide](https://www.milvus-io/docs/master/userguide/install_milvus.md) for details.
+Use Docker to install Milvus is a breeze. See the [Milvus install guide](https://milvus.io/docs/en/userguide/install_milvus/) for details.
 
 #### Use source code
 
@@ -185,17 +188,17 @@ $ python3 example.py
 
 ## Contribution guidelines
 
-Contributions are welcomed and greatly appreciated. If you want to contribute to Milvus, please read the [contribution guidelines](CONTRIBUTING.md). This project adheres to the [code of conduct](CODE OF CONDUCT.md) of Milvus. By participating, you are expected to uphold this code.
+Contributions are welcomed and greatly appreciated. If you want to contribute to Milvus, please read our [contribution guidelines](CONTRIBUTING.md). This project adheres to the [code of conduct](CODE OF CONDUCT.md) of Milvus. By participating, you are expected to uphold this code.
 
-We use [GitHub issues](https://github.com/milvus-io/milvus/issues) to track issues and bugs. For general questions and discussions, please go to [Milvus Forum]. 
+We use [GitHub issues](https://github.com/milvus-io/milvus/issues) to track issues and bugs. For general questions and public discussions, please join our community.
 
 ## Join the Milvus community
 
-For public discussion of Milvus, please join our [discussion group](milvusio.slack.com). 
+To connect with other users and contributors, welcome to join our [slack channel](https://join.slack.com/t/milvusio/shared_invite/enQtNzY1OTQ0NDI3NjMzLWNmYmM1NmNjOTQ5MGI5NDhhYmRhMGU5M2NhNzhhMDMzY2MzNDdlYjM5ODQ5MmE3ODFlYzU3YjJkNmVlNDQ2ZTk). 
 
 ## Milvus Roadmap
 
-Please read our [roadmap](milvus-io/milvus/docs/master/roadmap.md) to learn about upcoming features.
+Please read our [roadmap](https://milvus.io/docs/en/roadmap/) to learn about upcoming features.
 
 ## Resources
 
@@ -207,7 +210,7 @@ Please read our [roadmap](milvus-io/milvus/docs/master/roadmap.md) to learn abou
 
 [Milvus CSDN](https://mp.csdn.net/mdeditor/100041006#)
 
-[Milvus roadmap](https://www.milvus-io/docs/master/roadmap.md)
+[Milvus roadmap](https://milvus.io/docs/en/roadmap/)
 
 
 ## License

cpp/src/core/cmake/ThirdPartyPackagesCore.cmake

@@ -123,6 +123,7 @@ if(NOT DEFINED USE_JFROG_CACHE)
     set(USE_JFROG_CACHE "OFF")
 endif()
 if(USE_JFROG_CACHE STREQUAL "ON")
+    set(JFROG_ARTFACTORY_CACHE_URL "${JFROG_ARTFACTORY_URL}/generic-local/milvus/thirdparty/cache/${CMAKE_OS_NAME}/${KNOWHERE_BUILD_ARCH}/${BUILD_TYPE}")
     set(THIRDPARTY_PACKAGE_CACHE "${THIRDPARTY_DIR}/cache")
 endif()