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https://issues.apache.org/jira/browse/HDFS-10723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412331#comment-15412331
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Kihwal Lee commented on HDFS-10723:
-----------------------------------
When a {{MiniDFSCluster}} is brought up without setting the rpc port, it will
binds to a random available port. There is no need to find and specify one. So
making it bind to a random port is easy. Take a look at other test cases.
The test might be trying to use the same port for a specific reason. If this is
the case, fixing it will be a bit more complicated.
> TestRenameWhileOpen tries to restart NN with the same rpc port
> --------------------------------------------------------------
>
> Key: HDFS-10723
> URL: https://issues.apache.org/jira/browse/HDFS-10723
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Reporter: Kihwal Lee
> Attachments: testWhileOpenRenameParentToNonexistentDir.txt
>
>
> In {{testWhileOpenRenameParentToNonexistentDir}},
> {code}
> // restart cluster with the same namenode port as before.
> // This ensures that leases are persisted in fsimage.
> cluster.shutdown();
> {code}
> And we are getting test failures in precommit builds.
> {noformat}
> java.net.BindException: Problem binding to [localhost:47395]
> java.net.BindException: Address already in use;
> {noformat}
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