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https://issues.apache.org/jira/browse/HDFS-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers resolved HDFS-3958.
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Resolution: Duplicate
Resolving as a duplicate of HDFS-5138, which has a lot more discussion about
how best to do this.
> Integrate upgrade/finalize/rollback with external journals
> ----------------------------------------------------------
>
> Key: HDFS-3958
> URL: https://issues.apache.org/jira/browse/HDFS-3958
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Todd Lipcon
>
> Currently the NameNode upgrade/rollback/finalize framework only supports
> local storage. With edits being stored in pluggable Journals, this could
> create certain difficulties - in particular, rollback wouldn't actually
> rollback the external storage to the old state.
> We should look at how to expose the right hooks to the external journal
> storage to snapshot/rollback/finalize.
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