FSImage layout version should be only once file is complete
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Key: HDFS-957
URL: https://issues.apache.org/jira/browse/HDFS-957
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.22.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Right now, the FSImage save code writes the LAYOUT_VERSION at the head of the
file, along with some other headers, and then dumps the directory into the
file. Instead, it should write a special IMAGE_IN_PROGRESS entry for the layout
version, dump all of the data, then seek back to the head of the file to write
the proper LAYOUT_VERSION. This would make it very easy to detect the case
where the FSImage save got interrupted.
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