Cannot upgrade 0.20.203 to 0.21 with an editslog present
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Key: HDFS-1842
URL: https://issues.apache.org/jira/browse/HDFS-1842
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.20.203.0
Reporter: Allen Wittenauer
Priority: Blocker
If a user installs 0.20.203 and then upgrades to 0.21 with an editslog present,
0.21 will corrupt the file system due to opcode re-usage.
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