Running rollback on new-version namenode destroys namespace
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Key: HDFS-1969
URL: https://issues.apache.org/jira/browse/HDFS-1969
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.22.0
Reporter: Todd Lipcon
Priority: Blocker
Fix For: 0.22.0
The following sequence leaves the namespace in an inconsistent/broken state:
- format NN using 0.20 (or any prior release, probably)
- run hdfs namenode -upgrade on 0.22. ^C the NN once it comes up.
- run hdfs namenode -rollback on 0.22 (this should fail but doesn't!)
This leaves the name directory in a state such that the version file claims
it's an 0.20 namespace, but the fsimage is in 0.22 format. It then crashes when
trying to start up.
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