Colin Patrick McCabe created HDFS-4173:
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Summary: If the NameNode has already been formatted, but a
QuroumJournal has not, auto-format it on startup
Key: HDFS-4173
URL: https://issues.apache.org/jira/browse/HDFS-4173
Project: Hadoop HDFS
Issue Type: Improvement
Components: journal-node, name-node
Affects Versions: 2.0.3-alpha
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
Priority: Minor
Attachments: HDFS-4173.001.patch
If we have multiple edit log directories, and some of them are formatted, but
others are not, we format the unformatted ones. However, when we implemented
QuorumJournalManager, we did not extend this behavior to it. It makes sense to
do this.
One use case is if you want to add a QuorumJournalManager URI ({{journal://}})
to an existing {{NameNode}}, without reformatting everything. There is
currently no easy way to do this, since {{namenode \-format}} will nuke
everything, and there's no other way to format the {{JournalNodes}}.
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