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https://issues.apache.org/jira/browse/SPARK-24744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-24744:
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Assignee: Apache Spark
> 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
> Assignee: Apache Spark
> Priority: Minor
>
> h3. Background
> When I use structured streaming to construct my application, there is
> something 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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