[jira] [Assigned] (SPARK-24744) Structured Streaming set SparkSession configuration with the value in the metadata if there is not a option set by user.

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-24744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-24744:
------------------------------------

    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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