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From "Brian Bockelman (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4995) Offline Namenode fsImage verification
Date Thu, 08 Jan 2009 18:52:59 GMT
Offline Namenode fsImage verification

                 Key: HADOOP-4995
                 URL: https://issues.apache.org/jira/browse/HADOOP-4995
             Project: Hadoop Core
          Issue Type: New Feature
            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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