[jira] [Commented] (SPARK-21752) Config spark.jars.packages is ignored in SparkSession config

["Sean Owen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-21752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129296#comment-16129296 ] 

Sean Owen commented on SPARK-21752:
-----------------------------------

At that point, your app has already launched. You can't change the driver classpath.

> 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.



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