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Using LXPLUS

For optimal NXCALS operation on LXPLUS, you can follow below instructions for prepare and later activate your virtual environment with other needed configuration steps:

Creating virtual environment (before first usage)

You should run it once, to create virtual env. Feel free to adjust VENV_PATH - but keep in mind, to use the same later to activate venv.

VENV_PATH=~/nxcals-env
python -m venv $VENV_PATH
source $VENV_PATH/bin/activate
python -m pip install -U --index-url https://acc-py-repo.cern.ch/repository/vr-py-releases/simple --trusted-host acc-py-repo.cern.ch nxcals

source /cvmfs/sft.cern.ch/lcg/views/LCG_102b/x86_64-centos7-gcc11-opt/setup.sh
VENV_PATH=~/nxcals-env
unset PYTHONPATH
python -m venv $VENV_PATH
source $VENV_PATH/bin/activate
python -m pip install -U --index-url https://acc-py-repo.cern.ch/repository/vr-py-releases/simple --trusted-host acc-py-repo.cern.ch nxcals

If you are using LXPLUS8 and LXPLUS9, then you will have to login to kerberos every time, when you will start new terminal session (and you want to use NXCALS). To simplify logging, you can generate keytab file, which allows you to login without passing password every time. To do so, please follow instruction in authentication chapter.

Running

source ~/nxcals-env/bin/activate
export KRB5CCNAME=$(mktemp)
chmod 600 $KRB5CCNAME
kinit -f -k -t $HOME/.keytab $USER
python3

source ~/nxcals-env/bin/activate
export KRB5CCNAME=$(mktemp)
chmod 600 $KRB5CCNAME
kinit -f
python3

source /cvmfs/sft.cern.ch/lcg/views/LCG_102b/x86_64-centos7-gcc11-opt/setup.sh
source ~/nxcals-env/bin/activate
unset SPARK_HOME
export JAVA_HOME=/usr/lib/jvm/jre-11
export KRB5CCNAME=$(mktemp)
chmod 600 $KRB5CCNAME
kinit -f -k -t $HOME/.keytab $USER
python3

source /cvmfs/sft.cern.ch/lcg/views/LCG_102b/x86_64-centos7-gcc11-opt/setup.sh
source ~/nxcals-env/bin/activate
unset SPARK_HOME
export JAVA_HOME=/usr/lib/jvm/jre-11
export KRB5CCNAME=$(mktemp)
chmod 600 $KRB5CCNAME
kinit -f
python3

source /cvmfs/sft.cern.ch/lcg/views/LCG_102b/x86_64-centos7-gcc11-opt/setup.sh
source ~/nxcals-env/bin/activate
unset SPARK_HOME
python3

Example

You can run simple example to check if everything works.

from nxcals.spark_session_builder import get_or_create
from nxcals.api.extraction.data.builders import DataQuery

spark = get_or_create()
query = DataQuery(spark).entities().system('CMW').keyValuesEq({"property": "Acquisition", "device": "EA.XSEC"}).timeWindow("2023-08-08 00:00:00.000", "2023-08-08 00:01:00.000").build()