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  1. Ambari
  2. AMBARI-12912

Python Wrapper Can Choose Two Different Python Versions

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.1.2
    • Component/s: None
    • Labels:
      None

      Description

      Environments that have 2 different versions of Python cause problems when
      running agent code in memory. This was encountered on an Ambari 1.6 upgrade to
      2.1 where Python 2.6 had all of the site-packages, but python2.7 was being
      chosen by the agent.

      The `ambari-python-wrap` script is the problem. Consider the code:

      export PYTHONPATH=/usr/lib/python2.6/site-packages:/usr/lib/python2.6/site-packages/ambari_commons:$PYTHONPATH

      1. reset settings
        unset PYTHON
      1. checking for preferable python versions
        if [ -a /usr/bin/python2.7 ] && [ -z "$PYTHON" ]; then
        PYTHON=/usr/bin/python2.7
        fi

      if [ -a /usr/bin/python2.6 ] && [ -z "$PYTHON" ]; then
      PYTHON=/usr/bin/python2.6
      fi

      This is hardcoding the `PYTHONPATH` to use `site-packages` from `python2.6`.
      But then, it choose the Python 2.7 executor as the wrapper. This means that
      the agents will be running as Python 2.7 and executing scripts with a Python
      2.6 site-package.

      The observed problem was that the "rpm" and "yum" packages could not be loaded
      by agent code on an INSTALL command since these packages were part of the 2.6
      site-packages and not 2.7 site-packages.

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              • Assignee:
                aonishuk Andrew Onischuk
                Reporter:
                aonishuk Andrew Onischuk
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                • Created:
                  Updated:
                  Resolved: