Spark is much slower than direct access MySQL

[Louis Hust]

Hi, all,

I am using spark DataFrame to fetch small table from MySQL,
and i found it cost so much than directly access MySQL Using JDBC.

Time cost for Spark is about 2033ms, and direct access at about 16ms.

Code can be found at:

https://github.com/louishust/sparkDemo/blob/master/src/main/java/DirectQueryTest.java

So If my configuration for spark is wrong? How to optimise Spark to achieve
the similar performance like direct access?

Any idea will be appreciated!