Aaron T. Myers created HDFS-5223:
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Summary: Allow edit log/fsimage format changes without changing
layout version
Key: HDFS-5223
URL: https://issues.apache.org/jira/browse/HDFS-5223
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 2.1.1-beta
Reporter: Aaron T. Myers
Currently all HDFS on-disk formats are version by the single layout version.
This means that even for changes which might be backward compatible, like the
addition of a new edit log op code, we must go through the full `namenode
-upgrade' process which requires coordination with DNs, etc. HDFS should
support a lighter weight alternative.
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