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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3224) Bug in check for DN re-registration with different storage ID
Date Fri, 05 Oct 2012 21:36:03 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Lowe updated HDFS-3224:
-----------------------------

    Attachment: HDFS-3224.patch

Here's a quick-n-dirty patch that fixes the issue in my limited testing.  Host2NodeMap.getDatanodeByName
was recently removed, so I added it back in.  It seems appropriate here although the name
is unfortunate re: confusion about host vs. name.

Still needs a unit test, but posting now for feedback on whether we really should be using
ip (host) vs ip:port (name).
                
> 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
>            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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