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https://issues.apache.org/jira/browse/SPARK-21752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16130274#comment-16130274
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Jakub Nowacki commented on SPARK-21752:
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OK I get the point. I think we should only consider this in an interactive,
notebook based environment. I don't use the master for sure in the
{{spark-submit}} executioner, but also using packages internally should be
discouraged.
I think it should be a bit more clear in documentation what can and what cannot
be used. Also, interactive environment like Jupyter or similar should be made
as an exception, or more clear description for setup should be provided.
Also, especially with using the above setting with packages, there is no
warning provided that this option is really ignored, thus, maybe one should be
added similar to the one with reusing existing SparkSession, i.e.
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala#L896
> 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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