Hokuto Tateyama created BEAM-9007:
-------------------------------------
Summary: beam.ParDo setup() will call several times when using
python subprocess
Key: BEAM-9007
URL: https://issues.apache.org/jira/browse/BEAM-9007
Project: Beam
Issue Type: Bug
Components: beam-community, examples-python
Affects Versions: 2.16.0, 2.15.0
Environment: python 3.5
apache-beam[gcp] == 2.16.*
google-cloud-storage == 1.23.*
google-resumable-media == 0.5.*
googleapis-common-protos == 1.6.*
grpc-google-logging-v2 == 0.11.*
Reporter: Hokuto Tateyama
Assignee: Aizhamal Nurmamat kyzy
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.
h1. 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.
h1. 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.
{code:python}
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{code}
・Command list to pass run_cmd() function.
{code:python}
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”]
]
{code}
h1. 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/]
R_egards, Collonville_
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