When using the parallelization options in hadd, it appears that the sub-processes do not respect the compression flags. I set -ff to ensure the target and source files have the same compression. Without parallelization, this appears to work just fine: $ hadd -ff test.root ... hadd Target file: te…

Hi, Thanks for the interesting post. What ROOT version are you using? Is it possible for you to share (a few of )your input files as well as the exact commands used for the merging? Cheers, Danilo

Sorry, here is a full reproducer: demo.py: import os import ROOT as r print("ROOT version:", r.gROOT.GetVersion()) print( "default compression level: ", r.RCompressionSetting.EDefaults.kUseCompiledDefault ) explicit_compression_level = 509 assert ( r.RCompressionSetting.EDefaults.kUseCo…

FYI, this has been fixed by [hadd] Fix missing argument in parallel merger by ferdymercury · Pull Request #19489 · root-project/root · GitHub

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Hadd parallelization does not respect compression settings

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