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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1762) Namenode does not need to store storageID and datanodeID persistently
Date Thu, 13 Sep 2007 22:47:32 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Raghu Angadi updated HADOOP-1762:
---------------------------------

    Attachment: HADOOP-1762-Opt2.patch

Oops wrong patch attached earlier.

> Namenode does not need to store storageID and datanodeID persistently
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-1762
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1762
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.14.0
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>         Attachments: HADOOP-1762-Opt2.patch, HADOOP-1762-Opt2.patch, HADOOP-1762-Opt2.patch,
HADOOP-1762-Opt2.patch, HADOOP-1762-Opt2.patch, HADOOP-1762-Opt2.patch, HADOOP-1762.patch,
HADOOP-1762.patch
>
>
> Currently Namenode stores all the storage-ids it generates since the beginning (since
last format). It allocates a new storageID everytime a new datanode comes online. It also
stores all the known datanode ids since the beginning. 
> It would be better if Namenode did not have to keep track of these. I will describe a
proposal in the next comment. 
> This has implecations regd how Namenode helps administrators identify 'dead datanodes'
etc. These issues are addressed in HADOOP-1138.

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