Siyao Meng created HDFS-15539:
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Summary: When disallowing snapshot on a dir, throw exception if
its snapshot root is not empty
Key: HDFS-15539
URL: https://issues.apache.org/jira/browse/HDFS-15539
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: Siyao Meng
Assignee: Siyao Meng
When snapshot is disallowed on a dir, {{getTrashRoots()}} won't return the
trash root in that dir anymore (if any). The risk is the trash root will be
left there forever.
We need to throw an exception there and prompt the user to clean up or rename
the trash root if it is not empty.
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