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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4995) Offline Namenode fsImage verification
Date Fri, 09 Jan 2009 05:36:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4995?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-4995:
-------------------------------------

    Component/s: dfs

> Offline Namenode fsImage verification
> -------------------------------------
>
>                 Key: HADOOP-4995
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4995
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Brian Bockelman
>
> Currently, there is no way to verify that a copy of the fsImage is not corrupt.  I propose
that we should have an offline tool that loads the fsImage into memory to see if it is usable.
 This will allow us to automate backup testing to some extent.
> One can start a namenode process on the fsImage to see if it can be loaded, but this
is not easy to automate.
> To use HDFS in production, it is greatly desired to have both checkpoints - and have
some idea that the checkpoints are valid!  No one wants to see the day where they reload from
backup only to find that the fsImage in the backup wasn't usable.

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