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https://issues.apache.org/jira/browse/SPARK-19163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15816318#comment-15816318
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Apache Spark commented on SPARK-19163:
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User 'zero323' has created a pull request for this issue:
https://github.com/apache/spark/pull/16536
> Lazy creation of the _judf
> --------------------------
>
> Key: SPARK-19163
> URL: https://issues.apache.org/jira/browse/SPARK-19163
> Project: Spark
> Issue Type: Sub-task
> Components: PySpark, SQL
> Affects Versions: 1.6.0, 2.0.0, 2.1.1
> Reporter: Maciej Szymkiewicz
>
> Current state
> Right {{UserDefinedFunction}} eagerly creates {{_judf}} and initializes
> {{SparkSession}}
> (https://github.com/apache/spark/blob/master/python/pyspark/sql/functions.py#L1832)
> as a side effect. This behavior may have undesired results when {{udf}} is
> imported from a module:
> {{myudfs.py}}
> {code}
> from pyspark.sql.functions import udf
> from pyspark.sql.types import IntegerType
>
> def _add_one(x):
> """Adds one"""
> if x is not None:
> return x + 1
>
> add_one = udf(_add_one, IntegerType())
> {code}
>
>
> Example session:
> {code}
> In [1]: from pyspark.sql import SparkSession
> In [2]: from myudfs import add_one
> Setting default log level to "WARN".
> To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use
> setLogLevel(newLevel).
> 17/01/07 19:55:44 WARN Utils: Your hostname, xxx resolves to a loopback
> address: 127.0.1.1; using xxx instead (on interface eth0)
> 17/01/07 19:55:44 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to
> another address
> In [3]: spark = SparkSession.builder.appName("foo").getOrCreate()
> In [4]: spark.sparkContext.appName
> Out[4]: 'pyspark-shell'
> {code}
> Proposed
> Delay {{_judf}} initialization until the first call.
> {code}
> In [1]: from pyspark.sql import SparkSession
> In [2]: from myudfs import add_one
> In [3]: spark = SparkSession.builder.appName("foo").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). For SparkR, use
> setLogLevel(newLevel).
> 17/01/07 19:58:38 WARN Utils: Your hostname, xxx resolves to a loopback
> address: 127.0.1.1; using xxx instead (on interface eth0)
> 17/01/07 19:58:38 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to
> another address
> In [4]: spark.sparkContext.appName
> Out[4]: 'foo'
> {code}
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