Siyao Meng created HDFS-15492:
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Summary: 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
Reporter: Siyao Meng
Assignee: Siyao Meng
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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