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https://issues.apache.org/jira/browse/SPARK-16263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon updated SPARK-16263:
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Labels: bulk-closed (was: )
> SparkSession caches configuration in an unituitive global way
> -------------------------------------------------------------
>
> Key: SPARK-16263
> URL: https://issues.apache.org/jira/browse/SPARK-16263
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Reporter: Vladimir Feinberg
> Priority: Minor
> Labels: bulk-closed
>
> The following use case demonstrates the issue. Note that as a workaround to
> SPARK-16262 I use {{reset_spark()}} to stop the current {{SparkSession}}.
> {code}
> >>> from pyspark.sql import SparkSession
> >>> def reset_spark(): global spark; spark.stop();
> >>> SparkSession._instantiatedContext = None
> ...
> >>> spark = SparkSession.builder.getOrCreate()
> Using Spark's default log4j profile:
> org/apache/spark/log4j-defaults.properties
> Setting default log level to "WARN".
> To adjust logging level use sc.setLogLevel(newLevel).
> 16/06/28 11:41:36 WARN NativeCodeLoader: Unable to load native-hadoop library
> for your platform... using builtin-java classes where applicable
> 16/06/28 11:41:36 WARN Utils: Your hostname, vlad-databricks resolves to a
> loopback address: 127.0.1.1; using 192.168.3.166 instead (on interface
> enp0s31f6)
> 16/06/28 11:41:36 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to
> another address
> >>> spark.conf.get("spark.sql.retainGroupColumns")
> u'true'
> >>> reset_spark()
> >>> spark = SparkSession.builder.config("spark.sql.retainGroupColumns",
> >>> "false").getOrCreate()
> >>> spark.conf.get("spark.sql.retainGroupColumns")
> u'false'
> >>> reset_spark()
> >>> spark = SparkSession.builder.getOrCreate()
> >>> spark.conf.get("spark.sql.retainGroupColumns")
> u'false'
> >>>
> {code}
> The last line should output {{u'true'}} instead - there is absolutely no
> expectation for global config state to persist across sessions, which should
> use default configuration unless deviated from in each session's specific
> builder.
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