Tsz Wo (Nicholas), SZE created HDFS-5526:
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Summary: Datanode cannot roll back to previous layout version
Key: HDFS-5526
URL: https://issues.apache.org/jira/browse/HDFS-5526
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Reporter: Tsz Wo (Nicholas), SZE
Priority: Blocker
Current trunk layout version is -48.
Hadoop v2.2.0 layout version is -47.
If a cluster is upgraded from v2.2.0 (-47) to trunk (-48), the datanodes cannot
start with -rollback. It will fail with IncorrectVersionException.
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