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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, 06 Oct 2016 08:52:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15551366#comment-15551366
] 

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

A port number of 0 means that the port number is automatically allocated, typically from an
ephemeral port range. 

Yes, there can be a race condition - a different process / thread may bind to the same port
immediately after we close the ServerSocket instance.

> 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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