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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13234) Get random port by new ServerSocket(0).getLocalPort() in ServerSocketUtil#getPort
Date Wed, 05 Oct 2016 18:19:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15549549#comment-15549549
] 

Xiaoyu Yao commented on HADOOP-13234:
-------------------------------------

[~brahmareddy], does {{new ServerSocket(0).getLocalPort()}} guarantee a successful bind later
across JVM instances? I.e., an OS level reservation of the port returned? If not, we may still
hit race between the time of check and the time of port binding on the server. 

> 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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