I wish to read ROOT ntuples from EOS as distributed RDataFrames using the CERN Spark cluster on SWAN. I found an example from the last ROOT workshop: https://github.com/etejedor/distrdf-dimuon-analysis/blob/main/Dimuon_Python_Combined.ipynb. However, when running it on SWAN, the h.Draw() job fails. Attached is the error I get.
I have been working for months with the SWAN + Spark cluster framework with parquet files, filtering data and plotting histograms.
Now that I have ROOT files, I’d like to set analogous notebooks for the analysis. Any expert who could help me set the the environment correctly? I have not found detailed documentation; it would be great if you could point me to more examples and explanations of the integration between RDataFrame and Spark within SWAN.
Thank you for your time.