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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3224) Bug in check for DN re-registration with different storage ID
Date Mon, 08 Oct 2012 19:10:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471774#comment-13471774
] 

Jason Lowe commented on HDFS-3224:
----------------------------------

The TestHDFSFileSystemContract failure appears to be unrelated.  The test passes for me locally,
and I see no evidence in the logs that it decided to replace one datanode registration with
another, which is the essence of this change.
                
> 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, 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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