Github user dongjoon-hyun commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20359#discussion_r163678423
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/DriverRegistry.scala
 ---
    @@ -32,6 +32,9 @@ import org.apache.spark.util.Utils
      */
     object DriverRegistry extends Logging {
     
    +  // Initialize DriverManager first to prevent potential deadlocks between 
DriverManager and Driver
    +  DriverManager.getDrivers
    --- End diff --
    
    I'm wondering if you can merge this PR if I can test this patch in 
somewhere of our customer cluster. :)


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