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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-993) Namenode does not need to store any data node info persistently.
Date Fri, 16 Mar 2007 00:36:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12481391
] 

Raghu Angadi commented on HADOOP-993:
-------------------------------------


Mainly simplicity. I think this is one of the many features in Namenode that are useful but
not strictly namenode functionality. Namenode is a major hotspot. May be we could have helper
application that provides such features.

Currently namenode will list dead nodes. But is is not persistent across restarts.



> Namenode does not need to store any data node info persistently.
> ----------------------------------------------------------------
>
>                 Key: HADOOP-993
>                 URL: https://issues.apache.org/jira/browse/HADOOP-993
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Raghu Angadi
>         Assigned To: Sameer Paranjpye
>         Attachments: noDatanodesInFsimage.patch
>
>
> Namenode does not need to serialize datanode info. It will map datanode to storageID
when datanode register.

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