bjkonglu created SPARK-24744:
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Summary: Structured Streaming set SparkSession configuration with
the value in the metadata if there is not a option set by user.
Key: SPARK-24744
URL: https://issues.apache.org/jira/browse/SPARK-24744
Project: Spark
Issue Type: Improvement
Components: Structured Streaming
Affects Versions: 2.3.1
Reporter: bjkonglu
h3. Background
When I use structured streaming to construct my application, there is some odd!
The application always set option [spark.sql.shuffle.partitions] to default
value [200]. Even though, I set [spark.sql.shuffle.partitions] to other value
by SparkConf or --conf spark.sql.shuffle.partitions=100, but it doesn't work.
The option value is default value as before.
h3. Analyse
I review the relevant code. The relevant code is in
[org.apache.spark.sql.execution.streaming.OffsetSeqMetadata].
{code:scala}
/** Set the SparkSession configuration with the values in the metadata */
def setSessionConf(metadata: OffsetSeqMetadata, sessionConf: RuntimeConfig):
Unit = {
OffsetSeqMetadata.relevantSQLConfs.map(_.key).foreach { confKey =>
metadata.conf.get(confKey) match {
case Some(valueInMetadata) =>
// Config value exists in the metadata, update the session config
with this value
val optionalValueInSession = sessionConf.getOption(confKey)
if (optionalValueInSession.isDefined && optionalValueInSession.get !=
valueInMetadata) {
logWarning(s"Updating the value of conf '$confKey' in current
session from " +
s"'${optionalValueInSession.get}' to '$valueInMetadata'.")
}
sessionConf.set(confKey, valueInMetadata)
case None =>
// For backward compatibility, if a config was not recorded in the
offset log,
// then log it, and let the existing conf value in SparkSession
prevail.
logWarning (s"Conf '$confKey' was not found in the offset log, using
existing value")
}
}
}
{code}
In this code, we can find it always set some option in metadata value. But as
user, we want to those option can set by user.
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