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From "Andrii Vozniuk (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-1212) Data-nodes should be formatted when the name-node is formatted.
Date Mon, 09 Feb 2009 08:30:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671758#action_12671758
] 

avozniuk edited comment on HADOOP-1212 at 2/9/09 12:30 AM:
-----------------------------------------------------------------

Have had the same problem with version 0.19.0. On initial stage solved it deleting dfs.data.dir
folders on the problematic datanodes and reformatting the namenode.

      was (Author: avozniuk):
    Have had the same problem with version 0.19.0. On initial stage solved it deleting dfs.data.dir
folders on the problematic datanodes and reformating the namenode.
  
> Data-nodes should be formatted when the name-node is formatted.
> ---------------------------------------------------------------
>
>                 Key: HADOOP-1212
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1212
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.12.2
>            Reporter: Konstantin Shvachko
>
> The upgrade feature HADOOP-702 requires data-nodes to store persistently the namespaceID

> in their version files and verify during startup that it matches the one stored on the
name-node.
> When the name-node reformats it generates a new namespaceID.
> Now if the cluster starts with the reformatted name-node, and not reformatted data-nodes
> the data-nodes will fail with
> java.io.IOException: Incompatible namespaceIDs ...
> Data-nodes should be reformatted whenever the name-node is. I see 2 approaches here:
> 1) In order to reformat the cluster we call "start-dfs -format" or make a special script
"format-dfs".
> This would format the cluster components all together. The question is whether it should
start
> the cluster after formatting?
> 2) Format the name-node only. When data-nodes connect to the name-node it will tell them
to
> format their storage directories if it sees that the namespace is empty and its cTime=0.
> The drawback of this approach is that we can loose blocks of a data-node from another
cluster
> if it connects by mistake to the empty name-node.

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