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https://issues.apache.org/jira/browse/SPARK-21752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131945#comment-16131945
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Jakub Nowacki commented on SPARK-21752:
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[~skonto] What you are doing is in fact starting manually pyspark
({{shell.py}}) inside jupyter, which creates SparkSession, so what I written
above doesn't have any effect as it is the same as running pyspark command.
More Pythonic way of installing it is either adding modules to PYTHONPATH from
the bundle {{python}} folder (e.g.
http://sigdelta.com/blog/how-to-install-pyspark-locally/), which is very
similar to what happens when you use {{pip}}/{{conda}} install. Also, I am
referring to a plain python kernel in Jupyter (or any other python interpreter)
started without executing {{shell.py}}. BTW you can create kernels in Jupyter
e.g. https://gist.github.com/cogfor/903c911c9b1963dcd530bbc0b9d9f0ce, which
will work as pyspark shell, similar to your setup
While I understand that not desired behavior to use {{master}} or
{{spark.jars.packages}} in the config, I'd like to work out a preferred way of
passing configuration options to SparkSession, especially for notebook users.
Also, my experience is that many of the options other than {{master}} and
{{spark.jars.packages}} work quite well with the SparkSession config, e.g.
{{spark.executor.memory}} etc, which are sometimes need to be tuned to run some
specific jobs; in a generic jobs I always rely on the defaults, which I often
tune for a specific cluster.
So my question is: in case we need to add some custom configuration to PySpark
submission, should interactive Python users:
# add *all* configurations to {{PYSPARK_SUBMIT_ARGS}}
# some configuration like {{master}} or {{packages}} to to
{{PYSPARK_SUBMIT_ARGS}} but others can be passed in the SparkSession config,
maybe also saying which ones they are
# we should fix something in SparkSession creation to make SparkSession config
equally effective to {{PYSPARK_SUBMIT_ARGS}}
Also, sometimes we know that e.g. job (not interactive, run by
{{spark-submit}}) requires more executor memory or different number of
partitions. Could we in this case use SparkSession config or each of these
tuned parameters should be passed via {{spark-submit}} arguments?
I'm happy to extend the documentation with such section for Python users as I
don't think it's clear currently and would be very useful for python users.
> Config spark.jars.packages is ignored in SparkSession config
> ------------------------------------------------------------
>
> Key: SPARK-21752
> URL: https://issues.apache.org/jira/browse/SPARK-21752
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Jakub Nowacki
>
> If I put a config key {{spark.jars.packages}} using {{SparkSession}} builder
> as follows:
> {code}
> spark = pyspark.sql.SparkSession.builder\
> .appName('test-mongo')\
> .master('local[*]')\
> .config("spark.jars.packages",
> "org.mongodb.spark:mongo-spark-connector_2.11:2.2.0")\
> .config("spark.mongodb.input.uri", "mongodb://mongo/test.coll") \
> .config("spark.mongodb.output.uri", "mongodb://mongo/test.coll") \
> .getOrCreate()
> {code}
> the SparkSession gets created but there are no package download logs printed,
> and if I use the loaded classes, Mongo connector in this case, but it's the
> same for other packages, I get {{java.lang.ClassNotFoundException}} for the
> missing classes.
> If I use the config file {{conf/spark-defaults.comf}}, command line option
> {{--packages}}, e.g.:
> {code}
> import os
> os.environ['PYSPARK_SUBMIT_ARGS'] = '--packages
> org.mongodb.spark:mongo-spark-connector_2.11:2.2.0 pyspark-shell'
> {code}
> it works fine. Interestingly, using {{SparkConf}} object works fine as well,
> e.g.:
> {code}
> conf = pyspark.SparkConf()
> conf.set("spark.jars.packages",
> "org.mongodb.spark:mongo-spark-connector_2.11:2.2.0")
> conf.set("spark.mongodb.input.uri", "mongodb://mongo/test.coll")
> conf.set("spark.mongodb.output.uri", "mongodb://mongo/test.coll")
> spark = pyspark.sql.SparkSession.builder\
> .appName('test-mongo')\
> .master('local[*]')\
> .config(conf=conf)\
> .getOrCreate()
> {code}
> The above is in Python but I've seen the behavior in other languages, though,
> I didn't check R.
> I also have seen it in older Spark versions.
> It seems that this is the only config key that doesn't work for me via the
> {{SparkSession}} builder config.
> Note that this is related to creating new {{SparkSession}} as getting new
> packages into existing {{SparkSession}} doesn't indeed make sense. Thus this
> will only work with bare Python, Scala or Java, and not on {{pyspark}} or
> {{spark-shell}} as they create the session automatically; it this case one
> would need to use {{--packages}} option.
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