[jira] [Commented] (HAMA-789) BspPeer launched fail because port is bound by others

["Edward J. Yoon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HAMA-789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13724850#comment-13724850 ] 

Edward J. Yoon commented on HAMA-789:
-------------------------------------

The reason of starting BSPPeer based on assigned port number by GroomServer, was to avoid race condition among the launched child processors. 

{quote}during the GroomServer release the port and peer listens the port, if other process in the operation system binds to the same port occasionally, the bsppeer will fail to start up because of "Address already in use" exception.{quote}

I think, we can use the retry mechanism in BSPPeer. 
                
> BspPeer launched fail because port is bound by others
> -----------------------------------------------------
>
>                 Key: HAMA-789
>                 URL: https://issues.apache.org/jira/browse/HAMA-789
>             Project: Hama
>          Issue Type: Bug
>          Components: bsp core
>    Affects Versions: 0.6.2
>            Reporter: MaoYuan Xian
>            Assignee: Suraj Menon
>             Fix For: 0.6.3
>
>         Attachments: HAMA-789.patch
>
>
> In GroomServer, we call BSPNetUtils.getNextAvailable to assigning the bsppeer listening port. After figures out an available port, the GroomServer release the port and launches the BspPeer(Child), then the child listens to this port.
> However, during the GroomServer release the port and peer listens the port, if other process in the operation system binds to the same port occasionally, the bsppeer will fail to start up because of "Address already in use" exception.

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