[jira] [Commented] (HADOOP-12656) MiniKdc throws "address in use" BindException

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-12656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15063260#comment-15063260 ] 

Wei-Chiu Chuang commented on HADOOP-12656:
------------------------------------------

Assigning this JIRA to myself. I think it should be possible to use an ephemeral port by specifying port number 0. 

> MiniKdc throws "address in use" BindException
> ---------------------------------------------
>
>                 Key: HADOOP-12656
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12656
>             Project: Hadoop Common
>          Issue Type: Bug
>         Environment: Jenkins
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>
> Another address in use error.
> I saw the test TestKerberosAuthenticationHandler.testNameRules failed due to porting binding error.
> https://builds.apache.org/job/Hadoop-common-trunk-Java8/827/testReport/org.apache.hadoop.security.authentication.server/TestKerberosAuthenticationHandler/testNameRules/
> Looking at MiniKdc implementation, if port is 0, the constructor use ServerSocket to find an unused port, assign the port number to the member variable {{port}} and close the ServerSocket object; later, in {{initKDCServer()}}, instantiate a TcpTransport object and bind at that port. 
> It appears that the port may be used in between, and then throw the exception.



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