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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2871) Add a "no-block-delete" mode for use in recovery operations
Date Wed, 01 Feb 2012 19:37:00 GMT
Add a "no-block-delete" mode for use in recovery operations
-----------------------------------------------------------

                 Key: HDFS-2871
                 URL: https://issues.apache.org/jira/browse/HDFS-2871
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Todd Lipcon


Occasionally due to operator error or some other reason, the NN metadata is accidentally lost
or corrupted. When recovering the cluster, we usually recommend that the operator force the
NN into safe mode at startup. But often this isn't quite enough, since they need to exit safe
mode in order to start other dependent services like HBase. It would be nice to add a safety
config for cases like this, that allows the NN to exit safe mode, but does not issue any block
deletions. Thus, if there is some problem, the NN could safely be restarted again with different
metadata with no (or minimized) dataloss.

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