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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3224) Bug in check for DN re-registration with different storage ID
Date Sun, 07 Oct 2012 21:00:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471321#comment-13471321
] 

Eli Collins commented on HDFS-3224:
-----------------------------------

Thanks for looking at this Jason.  Why not just fix the lookup to use IP rather than IP:port?
                
> Bug in check for DN re-registration with different storage ID
> -------------------------------------------------------------
>
>                 Key: HDFS-3224
>                 URL: https://issues.apache.org/jira/browse/HDFS-3224
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Eli Collins
>            Assignee: Jason Lowe
>            Priority: Minor
>         Attachments: HDFS-3224.patch
>
>
> DatanodeManager#registerDatanode checks the host to node map using an IP:port key, however
the map is keyed on IP, so this check will always fail. It's performing the check to determine
if a DN with the same IP and storage ID has already registered, and if so to remove this DN
from the map and indicate that eg it's no longer hosting these blocks. This bug has been here
forever.

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