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https://issues.apache.org/jira/browse/SPARK-3706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158200#comment-14158200
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Josh Rosen commented on SPARK-3706:
-----------------------------------
This introduced a problem, since after this patch we now use IPython on the
workers; see SPARK-3772 for more details.
> Cannot run IPython REPL with IPYTHON set to "1" and PYSPARK_PYTHON unset
> ------------------------------------------------------------------------
>
> Key: SPARK-3706
> URL: https://issues.apache.org/jira/browse/SPARK-3706
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 1.2.0
> Environment: Mac OS X 10.9.5, Python 2.7.8, IPython 2.2.0
> Reporter: cocoatomo
> Labels: pyspark
> Fix For: 1.2.0
>
>
> h3. Problem
> The section "Using the shell" in Spark Programming Guide
> (https://spark.apache.org/docs/latest/programming-guide.html#using-the-shell)
> says that we can run pyspark REPL through IPython.
> But a folloing command does not run IPython but a default Python executable.
> {quote}
> $ IPYTHON=1 ./bin/pyspark
> Python 2.7.8 (default, Jul 2 2014, 10:14:46)
> ...
> {quote}
> the spark/bin/pyspark script on the commit
> b235e013638685758885842dc3268e9800af3678 decides which executable and options
> it use folloing way.
> # if PYSPARK_PYTHON unset
> #* → defaulting to "python"
> # if IPYTHON_OPTS set
> #* → set IPYTHON "1"
> # some python scripts passed to ./bin/pyspak → run it with ./bin/spark-submit
> #* out of this issues scope
> # if IPYTHON set as "1"
> #* → execute $PYSPARK_PYTHON (default: ipython) with arguments $IPYTHON_OPTS
> #* otherwise execute $PYSPARK_PYTHON
> Therefore, when PYSPARK_PYTHON is unset, python is executed though IPYTHON is
> "1".
> In other word, when PYSPARK_PYTHON is unset, IPYTHON_OPS and IPYTHON has no
> effect on decide which command to use.
> ||PYSPARK_PYTHON||IPYTHON_OPTS||IPYTHON||resulting command||expected command||
> |(unset → defaults to python)|(unset)|(unset)|python|(same)|
> |(unset → defaults to python)|(unset)|1|python|ipython|
> |(unset → defaults to python)|an_option|(unset → set to 1)|python
> an_option|ipython an_option|
> |(unset → defaults to python)|an_option|1|python an_option|ipython an_option|
> |ipython|(unset)|(unset)|ipython|(same)|
> |ipython|(unset)|1|ipython|(same)|
> |ipython|an_option|(unset → set to 1)|ipython an_option|(same)|
> |ipython|an_option|1|ipython an_option|(same)|
> h3. Suggestion
> The pyspark script should determine firstly whether a user wants to run
> IPython or other executables.
> # if IPYTHON_OPTS set
> #* set IPYTHON "1"
> # if IPYTHON has a value "1"
> #* PYSPARK_PYTHON defaults to "ipython" if not set
> # PYSPARK_PYTHON defaults to "python" if not set
> See the pull request for more detailed modification.
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