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https://issues.apache.org/jira/browse/HDFS-11101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15682634#comment-15682634
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Akira Ajisaka commented on HDFS-11101:
--------------------------------------

+1. In this test, the following setting is necessary.
{code}
          .nameNodePort(ServerSocketUtil.waitForPort(
              HdfsClientConfigKeys.DFS_NAMENODE_RPC_PORT_DEFAULT, 10))
{code}
because hdfs://localhost/testfile2 is implicitly treated as 
hdfs://localhost:9820/testfile2 in FsShell regardless of the configuration used 
by FsShell. Therefore I'm +1 for increasing the retry count.

> TestDFSShell#testMoveWithTargetPortEmpty fails intermittently
> -------------------------------------------------------------
>
>                 Key: HDFS-11101
>                 URL: https://issues.apache.org/jira/browse/HDFS-11101
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>         Attachments: HDFS-11101.patch
>
>
> {noformat}
> java.io.IOException: Port is already in use; giving up after 10 times.
>       at 
> org.apache.hadoop.net.ServerSocketUtil.waitForPort(ServerSocketUtil.java:98)
>       at 
> org.apache.hadoop.hdfs.TestDFSShell.testMoveWithTargetPortEmpty(TestDFSShell.java:778)
> {noformat}



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