Add a "no-block-delete" mode for use in recovery operations
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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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