Steve Loughran created HADOOP-16429:
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Summary: DynamoDBMetaStore deleteSubtree to delete leaf nodes first
Key: HADOOP-16429
URL: https://issues.apache.org/jira/browse/HADOOP-16429
Project: Hadoop Common
Issue Type: Sub-task
Components: fs/s3
Affects Versions: 3.3.0
Reporter: Steve Loughran
in {{deleteSubtree(path)}}, the DynamoDB metastore walks down the tree,
returning elements to delete. But it will delete parent entries before
children, so if an operation fails partway through, there will be orphans
Better: DescendantsIterator to return all the leaf nodes before their parents
so the deletion is done bottom up
Also: push the deletions off into their own async queue/pool so that they don't
become the bottleneck on the process
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