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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13234) Get random port by new ServerSocket(0).getLocalPort() in ServerSocketUtil#getPort
Date Thu, 27 Oct 2016 07:14:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15610986#comment-15610986
] 

Brahma Reddy Battula commented on HADOOP-13234:
-----------------------------------------------

Ok..Only difference might {{ServerSocket(0).getLocalPort()}} will give free port (32768-61000
on Linux and 49152-65535 on Windows) and {{getPort{p, retries)}} will retries the range between
p and 65535( diff might be retry).

So we can close this issue..? and to adress the following which is mentioned by [~xyao], need
to increase the retry..?
{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:809)
{noformat}

> Get random port by new ServerSocket(0).getLocalPort() in ServerSocketUtil#getPort
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-13234
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13234
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>         Attachments: HADOOP-13234-002.patch, HADOOP-13234.patch
>
>
> As per [~iwasakims] comment from [here|https://issues.apache.org/jira/browse/HDFS-10367?focusedCommentId=15275604&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15275604]
> we can get available random port by {{new ServerSocket(0).getLocalPort()}} and it's more
portable. 



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