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https://issues.apache.org/jira/browse/HDFS-15492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-15492 started by Siyao Meng.
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> Make trash root inside each snapshottable directory
> ---------------------------------------------------
>
> Key: HDFS-15492
> URL: https://issues.apache.org/jira/browse/HDFS-15492
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, hdfs-client
> Affects Versions: 3.2.1
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
>
> We have seen FSImage corruption cases (e.g. HDFS-13101) where files inside
> one snapshottable directories are moved outside of it. The most common case
> of this is when trash is enabled and user deletes some file via the command
> line without skipTrash.
> This jira aims to make a trash root for each snapshottable directory, same as
> how encryption zone behaves at the moment.
> This will make trash cleanup a little bit more expensive on the NameNode as
> it will be to iterate all trash roots. But should be fine as long as there
> aren't many snapshottable directories.
> I could make this improvement as an option and disable it by default if
> needed, such as {{dfs.namenode.snapshot.trashroot.enable}}
> One small caveat though, when disabling (disallowing) snapshot on the
> snapshottable directory when this improvement is in place. The client should
> merge the snapshottable directory's trash with that user's trash to ensure
> proper trash cleanup.
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