[GitHub] [beam] damccorm opened a new issue, #20098: beam.DoFn setup() will call several times when using python subprocess

[GitBox <gi...@apache.org>]

damccorm opened a new issue, #20098:
URL: https://github.com/apache/beam/issues/20098

   Hello. 
    I`m trying to use a make command on dataflow to use OpenCV source written in C********.
   
   I was thinking, *setup()* function on *beam.DoFn* will run only once a time before the process runs.
    So I tried to run build commands on the setup() function, and it will run successfully.
   - Problem
   
   After the running process, the setup() function will run again and try to build commands several times. I`ve checked these logs from my stack driver.
   - Codes
   
   These are my codes using dataflow. I defined the command_list in the class that inheritance from beam.DoFn and call run_cmd() from setup().
   
   ・Run command lines.
   ```
   
   def run_cmd(command_list: List[List[str]], shell: bool = False) -> List[Dict[str, Any]]:
   	outputs
   = []
   	try:
   		for cmd in command_list:
   			logging.info(cmd)
   			proc = subprocess.check_output(
   			cmd,
   shell=shell, stderr=subprocess.STDOUT, universal_newlines=True)
   			outputs.append({“Input: “: cmd,
   “Output: “: proc})
   	except subprocess.CalledProcessError as e:
   		logging.warning(“Return code:{},
   Output:{}”.format(e.returncode, e.output))
   
   	return outputs
   ```
   
   ・Command list to pass run_cmd() function.
   ```
   
   command_list = [
       [“cat /etc/issue”],
       [“apt-get —assume-yes update”],
       [
           “apt-get
   —assume-yes install —no-install-recommends ffmpeg git software-properties-common”
       ],
       [“apt-get
   install -y software-properties-common”],
       [
           ‘add-apt-repository -s “deb http://security.ubuntu.com/ubuntu
   bionic-security main”’
       ],
       [
           “apt-get install -y build-essential checkinstall cmake
   unzip pkg-config yasm unzip”
       ],
       [“apt-get -y install git gfortran python3-dev”],
       [
   
          “apt-get -y install libjpeg62-turbo-dev libpng-dev libpng16-16 libavcodec-dev libavformat-dev
   libswscale-dev libdc1394-22-dev libxine2-dev libv4l-dev”
       ],
       [“apt-get -y install libjpeg-dev
   libpng-dev libtiff-dev libtbb-dev”],
       [
           “apt-get -y install libavcodec-dev libavformat-dev
   libswscale-dev libv4l-dev libatlas-base-dev libxvidcore-dev libx264-dev libgtk-3-dev”
       ],
       [“apt-get
   clean”],
       [“rm -rf /var/lib/apt/lists/*”],
       [“git clone https://github.com/opencv/opencv.git”],
   
      [“git clone https://github.com/opencv/opencv_contrib.git”],
       [“cd opencv_contrib”],
       [“git
   checkout -b 3.4.3 refs/tags/3.4.3”],
       [“cd ../opencv/“],
       [“git checkout -b 3.4.3 refs/tags/3.4.3”],
   
      [“mkdir build”],
       [“cd build”],
       [
           “cmake -D CMAKE_BUILD_TYPE=Release \
         
            -D CMAKE_INSTALL_PREFIX=/usr/local \
                   -D WITH_TBB=ON \
                   -D
   OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules ..”
       ],
       [“make -j8”],
       [“make install”],
   
      [“echo /usr/local/lib > /etc/ld.so.conf.d/opencv.conf”],
       [“ldconfig -v”]
   ]
   
   ```
   
   - Question
   
   For my summary, I`m wondering if these are bugs for apache beam.
    - What is the reason for calling setup() several times?
    - Is there any solution to set up these commands only once in the total running? This is a method what I tried.
    ## Using os.system() instead of subprocess. I think subprocess will create another process on setup() so, it can not extract process finished successfully.
    ## Writing commands on setup.py and use it for CustomCommand
    [https://beam.apache.org/documentation/sdks/python-pipeline-dependencies/](https://beam.apache.org/documentation/sdks/python-pipeline-dependencies/)
   
    
   
   Regards, Collonville
   
   Imported from Jira [BEAM-9007](https://issues.apache.org/jira/browse/BEAM-9007). Original Jira may contain additional context.
   Reported by: Collonville.


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