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https://issues.apache.org/jira/browse/SPARK-23343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16353604#comment-16353604
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Apache Spark commented on SPARK-23343:
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User 'heary-cao' has created a pull request for this issue:
https://github.com/apache/spark/pull/20516

> Increase the exception test for the bind port
> ---------------------------------------------
>
>                 Key: SPARK-23343
>                 URL: https://issues.apache.org/jira/browse/SPARK-23343
>             Project: Spark
>          Issue Type: Test
>          Components: Spark Core
>    Affects Versions: 2.4.0
>            Reporter: caoxuewen
>            Priority: Minor
>
> this PR add new test case, 
> 1、add the boundary value test of port 65535
> 2、add the privileged port to test,
> 3、add rebinding port test when set `spark.port.maxRetries` is 1,
> 4、add `Utils.userPort` self circulation to generating port,
> in addition, in the existing test case, if you don't set the `spark.testing` 
> for true, the default value for `spark.port.maxRetries` is not 100, but 16, 
> (expectedPort + 100) is a little mistake.



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