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alien.py Debugging

There are a few steps to follow

Report the version

alien.py version

will provide an output like: 

alien.py version: 1.3.7
alien.py version date: 20211202_153804
alien.py location: /cvmfs/alice.cern.ch/el7-x86_64/Packages/xjalienfs/1.3.7-19/lib/python3.6/site-packages/alienpy/alien.py
script location: /cvmfs/alice.cern.ch/el7-x86_64/Packages/xjalienfs/1.3.7-19/bin/alien.py
Interpreter: /cvmfs/alice.cern.ch/el7-x86_64/Packages/Python/v3.6.10-149/bin/python3.6
Python version: 3.6.10 (default, Mar 17 2022, 14:52:02) 
[GCC 10.2.0]
XRootD version: 5.4.2-alice1
XRootD path: /cvmfs/alice.cern.ch/el7-x86_64/Packages/XRootD/v5.4.2-alice1-3/lib/python/site-packages/XRootD/client/__init__.py

this is not network dependent so it can be executed at any time

alien.py debug report

Enabling debug output
ALIENPY_DEBUG=1 ALIENPY_DEBUG_FILE=log.txt

  • ALIENPY_DEBUG - will enable the debug messages
  • ALIENPY_DEBUG_FILE - allow specification of output logfile. in the example above log.txt will be placed in CWD

XRootD debug report

Enabling XRootD system log output XRD_LOGLEVEL='Dump' XRD_LOGFILE=xrdlog.txt

  • XRD_LOGLEVEL='Dump' - will enable/change the log level; Dump is the highest
  • XRD_LOGFILE=xrdlog.txt - will specify the location of the log file.

Additionally for checking the downloading with xrdcp one can enable
the persistence of metafile(s) used for downloading:
ALIENPY_KEEP_META=1

this will copy in the CWD the metafiles used for downloading, which can be used with xrdcp:
xrdcp -p -P -f -v meta_file_name.meta4 destination_file

XRootD python import

For problems related to python loading of XRootD binding one can check with:
python3 -c 'from XRootD import client;print(client.__version__);'

and if this is valid, the actual location of library can be checked with:
python3 -c 'from XRootD import client;print(client.__file__);'

if the loading fails, one can ask on alice-project-analysis-task-force@cern.ch
or
fill an issue on alidist repository https://github.com/alisw/alidist/issues

Developer contact

Adrian Sevcenco adrian.sevcenco@cern.ch or on mattermost JAliEn channel: alice/channels/jalien
or mattermost direct message: @asevcenc

There is also a possibility for discussions on ALICE Talk
but i have to be made aware of discussion so please mention me