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

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

bjkonglu created SPARK-24744:
--------------------------------

             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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