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pyspark need Py2 to work, graceful and helping fail if system default is Py3 #392

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pyspark need Py2 to work, graceful and helping fail if system default is Py3 #392

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17 changes: 17 additions & 0 deletions bin/pyspark
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,23 @@ fi

# Figure out which Python executable to use
if [ -z "$PYSPARK_PYTHON" ] ; then
exit_if_not_python_version(){
_DefaultPythonVersion=`python --version | sed -s 's/[A-Za-z]*\ \([0-9]\)\..*/\1/'`
_RequirePythonVersion=$1

if [[ "$_RequirePythonVersion" != "$_DefaultPythonVersion" ]]; then
echo "Error: Default Python on this machine is Python${_DefaultPythonVersion}, PySpark requires Python2."
_RequirePython=`which python${_RequirePythonVersion} 2>/dev/null`
if [[ "$_RequirePython" == "" ]]; then
echo "You don't have Python2 installed; install it first. Then run 'PYSPARK_PYTHON=<path-to-python2> $0'"
else
echo "Run 'PYSPARK_PYTHON=${_RequirePython} $0'"
fi
exit 1
fi
}

exit_if_not_python_version 2
PYSPARK_PYTHON="python"
fi
export PYSPARK_PYTHON
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