Maxim Gekk created SPARK-24761:
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Summary: Check modifiability of config parameters
Key: SPARK-24761
URL: https://issues.apache.org/jira/browse/SPARK-24761
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.1
Reporter: Maxim Gekk
Our customers and support team continuously face to the situation when setting
a config parameter via *spark.conf.set()* does not may any effects. It is not
clear from parameter's name is it static parameter or one of the parameter that
can be set at runtime for current session state. It would be useful to have a
method of *RuntimeConfig* which could tell to an user - does the given
parameter may effect on the current behavior if he/she change it in the
spark-shell or running notebook. The method can have the following signature:
{code:scala}
def isModifiable(key: String): Boolean
{code}
Any config parameter can be checked by using the syntax like this:
{code:scala}
scala> spark.conf.isModifiable("spark.sql.sources.schemaStringLengthThreshold")
res0: Boolean = false
{code}
or for Spark Core parameter:
{code:scala}
scala> spark.conf.isModifiable("spark.task.cpus")
res1: Boolean = false
{code}
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