[TEST ONLY/DON'T MERGE] Tensorflow-IO DAOS Plugin

WORKSPACE

@@ -290,6 +290,17 @@ http_archive(
     ],
 )
 
+http_archive(
+    name = "daos",
+    build_file = "//third_party:daos.BUILD",
+    sha256 = "9789a5a0065cfa4249105f1676b9eba89f68b54bc03083140549b7a8a8f615d3",
+    strip_prefix = "daos-2.0.2",
+    urls = [
+        "https://storage.googleapis.com/mirror.tensorflow.org/github.com/daos-stack/daos/archive/refs/tags/v2.0.2.tar.gz",
+        "https://github.com/daos-stack/daos/archive/refs/tags/v2.0.2.tar.gz",
+    ],
+)
+
 http_archive(
     name = "dav1d",
     build_file = "//third_party:dav1d.BUILD",

docs/daos_tf_docs.md

@@ -0,0 +1,107 @@
+# DAOS-TensorFlow IO GUIDE
+
+## Table Of Contents
+
+- [Features](#features)
+- [Prerequisites](#prerequisites)
+- [Environment Setup](#environment-setup)
+- [Building](#building)
+- [Testing](#testing)
+- [Example](#example)
+
+## Features
+
+* Providing a plugin utilizing the DAOS DFS layer to provide efficient utilization for Intel's filesystem. The Read-Only Memory Region remains unsupported.
+
+## Prerequisites
+
+* A valid DAOS installation, currently based on [version v2.0.2](https://github.com/daos-stack/daos/releases/tag/v2.0.2)
+  * An installation guide and steps can be accessed from [here](https://docs.daos.io/admin/installation/)
+
+## Environment Setup
+
+Assuming you are in a terminal in the repository root directory:
+
+* Install latest versions of the following dependencies by running
+  * Centos 8
+    ```
+    $ yum install -y python3 python3-devel gcc gcc-c++ git unzip which make
+    ```
+  *  Ubuntu 20.04
+     ```
+     $ sudo apt-get -y -qq update 
+     $ sudo apt-get -y -qq install gcc g++ git unzip curl python3-pip
+     ```
+* Download the Bazel installer
+  ```
+    $ curl -sSOL https://github.com/bazelbuild/bazel/releases/download/\$(cat .bazelversion)/bazel-\$(cat .bazelversion)-installer-linux-x86_64.sh
+  ```
+* Install Bazel
+  ```
+  $ bash -x -e bazel-$(cat .bazelversion)-installer-linux-x86_64.sh
+  ```
+* Update Pip and install pytest
+  ```
+  $ python3 -m pip install -U pip
+  $ python3 -m pip install pytest
+  ```
+
+## Building
+
+Assuming you are in a terminal in the repository root directory:
+
+* Configure and install tensorflow (the current version should be tensorflow2.6.2)
+  ```
+  $ ./configure.sh
+  ## Set python3 as default.
+  $ ln -s /usr/bin/python3 /usr/bin/python
+  ```
+
+* At this point, all libraries and dependencies should be installed.
+  * Make sure the environment variable **LIBRARY_PATH** includes the paths to all daos libraries  
+  * Make sure the environment variable **LD_LIBRARY_PATH** includes the paths to:
+    * All daos libraries
+    * The tensorflow framework (libtensorflow and libtensorflow_framework)
+  * If not, find the required libraries and add their paths to the environment variable
+    ```
+    export LD_LIBRARY_PATH="<path-to-library>:$LD_LIBARY_PATH"
+    ```
+  * Make sure the environment variable **CPLUS_INCLUDE_PATH** and **C_INCLUDE_PATH** includes the paths to:
+    * The tensorflow headers (usually in /usr/local/lib64/python3.6/site-packages/tensorflow/include)
+  * If not, find the required headers and add their paths to the environment variable
+    ```
+    export CPLUS_INCLUDE_PATH="<path-to-headers>:$CPLUS_INCLUDE_PATH"
+    export C_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:$C_INCLUDE_PATH
+    ```
+
+* Build the project using bazel
+  ```
+  bazel build --action_env=LIBRARY_PATH=$LIBRARY_PATH -s --verbose_failures --spawn_strategy=standalone //tensorflow_io/... //tensorflow_io_gcs_filesystem/...
+  ```
+  This should take a few minutes. Note that sandboxing may result in build failures when using Docker Containers for DAOS due to mounting issues, if that’s the case, add **--spawn_strategy=standalone** to the above build command to bypass sandboxing. (When disabling sandbox, an error may be thrown for an undefined type z_crc_t due to a conflict in header files. Please find the crypt.h file in the bazel cache in subdirectory /external/zlib/contrib/minizip/crypt.h and add the following line to the file **typedef unsigned long z_crc_t;** then re-build)
+
+
+
+## Testing
+Assuming you are in a terminal in the repository root directory:
+
+* Run the following command for the simple serial test to validate building. Note that any tests need to be run with the TFIO_DATAPATH flag to specify the location of the binaries.
+  ```
+  $ TFIO_DATAPATH=bazel-bin python3 -m pytest -s -v tests/test_serialization.py
+
+  ```
+
+* Run the following commands to run the dfs plugin test:
+  ```
+  # To create the required pool and container and export required env variables for the dfs tests.
+  $ source tests/test_dfs/dfs_init.sh
+  # To run dfs tests
+  $ TFIO_DATAPATH=bazel-bin python3 -m pytest -s -v tests/test_dfs.py
+  # For Cleanup, deletes pools and containers created for test.
+  $ bash ./tests/test_dfs/dfs_cleanup.sh
+  ```
+
+## Example
+
+Please refer to [the DAOS notebook example in the tutorials folder in docs folder.](tutorials/daos.ipynb)
+