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Posted to issues@spark.apache.org by "Jose Torres (JIRA)" <ji...@apache.org> on 2019/03/22 20:56:00 UTC

[jira] [Created] (SPARK-27253) SparkSession clone discards SQLConf overrides in favor of SparkConf defaults

Jose Torres created SPARK-27253:
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             Summary: SparkSession clone discards SQLConf overrides in favor of SparkConf defaults
                 Key: SPARK-27253
                 URL: https://issues.apache.org/jira/browse/SPARK-27253
             Project: Spark
          Issue Type: Bug
          Components: Structured Streaming
    Affects Versions: 2.4.0
            Reporter: Jose Torres


SparkSession.cloneSession() is normally supposed to create a child session which inherits all the SQLConf values of its parent session. But when a SQL conf is given a global default through the SparkConf, this does not happen; the child session will receive the SparkConf default rather than its parent's SQLConf override.

 

This is particularly impactful in structured streaming, as the microbatches run in a cloned child session.



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