huanghuai created SPARK-25523:
---------------------------------

             Summary: Multithreading executive sparkSession.read().jdbc(url, 
table, properties) problem
                 Key: SPARK-25523
                 URL: https://issues.apache.org/jira/browse/SPARK-25523
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.3.0
         Environment: h3. [IntelliJ 
_IDEA_|http://www.baidu.com/link?url=7ZLtsOfyqR1YxLqcTU0Q-hqXWV_PsY6IzIzZoKhiXZZ4AcLrpQ4DoTG30yIN-Gs8]
 

local mode

 
            Reporter: huanghuai


when i execute sparkSession.read().jdbc(url, table, properties) in 2 or 3 
thread , it will be in limitless waiting.

 

I found it by debug step by step, and finally waited here: 

JdbcRelationProvider.createRelation() method

at line 34:

val jdbcOptions = new JDBCOptions(parameters)

 

when I press F8, Spark did not run away.

 



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