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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-56) hadoop nameserver does not recognise ndfs nameserver image
Date Fri, 24 Feb 2006 03:35:38 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-56?page=comments#action_12367623 ] 

eric baldeschwieler commented on HADOOP-56:
-------------------------------------------

As I understand the failure, we brought up a new nameserver on an old cluster (so no file
information).  The nameserver saw all the blocks of the old FS and decided they must all belong
to deleted files.  It then proceeded to remove them!!

This is bad.  We should have enough interlocks in place that in this situation the name server
haults and asks for help.  This is not only a risk during upgrades!  Other operator failures
could cause huge data lose.

> hadoop nameserver does not recognise ndfs nameserver image
> ----------------------------------------------------------
>
>          Key: HADOOP-56
>          URL: http://issues.apache.org/jira/browse/HADOOP-56
>      Project: Hadoop
>         Type: Bug
>   Components: dfs
>     Versions: 0.1
>     Reporter: Yoram Arnon
>     Priority: Critical
>  Attachments: ndfs.tar.gz
>
> hadoop nameserver does not recognise ndfs image
> Thus, upgrading from ndfs to hadoop dfs results in total data loss.
> The upgrade should be seemless, with the new server recognising all previous version
that are not end-of-life'd.

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