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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-894) DatanodeID.ipcPort is not updated when existing node re-registers
Date Tue, 09 Feb 2010 22:57:28 GMT

    [ https://issues.apache.org/jira/browse/HDFS-894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831732#action_12831732

Todd Lipcon commented on HDFS-894:

bq. datanodes typically re-register with the same ipcPort

Unless you've configured the datanode IPC port to 0 - I do this on my test clusters on shared
hardware, for example.

bq. this is not a regression

true enough. I find it an obvious enough bug that causes big problems when binding to port
0, that we should put it in all branches. But if you disagree, trunk's fine.

> 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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