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Date: Tue, 16 Feb 2010 23:15:29 +0000 (UTC)
From: "Tom White (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-894) DatanodeID.ipcPort is not updated when
 existing node re-registers
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     [ https://issues.apache.org/jira/browse/HDFS-894?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tom White updated HDFS-894:
---------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

I've just committed this. Thanks Todd!

> DatanodeID.ipcPort is not updated when existing node re-registers
> -----------------------------------------------------------------
>
>                 Key: HDFS-894
>                 URL: https://issues.apache.org/jira/browse/HDFS-894
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.20.1, 0.21.0, 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>         Attachments: hdfs-894.txt
>
>
> In FSNamesystem.registerDatanode, it checks if a registering node is a reregistration of an old one based on storage ID. If so, it simply updates the old one with the new registration info. However, the new ipcPort is lost when this happens.
> I produced manually this by setting up a DN with IPC port set to 0 (so it picks an ephemeral port) and then restarting the DN. At this point, the NN's view of the ipcPort is stale, and clients will not be able to achieve pipeline recovery.
> This should be easy to fix and unit test, but not sure when I'll get to it, so anyone else should feel free to grab it if they get to it first.

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