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https://issues.apache.org/jira/browse/HADOOP-3985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624502#action_12624502
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Hairong Kuang commented on HADOOP-3985:
---------------------------------------

The address binding error is caused by the datanode rpc server port which uses 
the default port number 50020 instead of the free port 0.

> TestHDFSServerPorts fails on trunk
> ----------------------------------
>
>                 Key: HADOOP-3985
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3985
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Amar Kamat
>
> {{TestHDFSServerPorts}} fails on trunk with
> {noformat}
> junit.framework.AssertionFailedError
>         at 
> org.apache.hadoop.hdfs.TestHDFSServerPorts.testDataNodePorts(TestHDFSServerPorts.java:186)
> {noformat}

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