Steve Loughran created HADOOP-15209:
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Summary: PoC: DistCp to eliminate needless deletion of files under
deleted directories
Key: HADOOP-15209
URL: https://issues.apache.org/jira/browse/HADOOP-15209
Project: Hadoop Common
Issue Type: Improvement
Components: tools/distcp
Affects Versions: 2.9.0
Reporter: Steve Loughran
DistCP issues a delete(file) request even if is underneath an already deleted
directory. This generates needless load on filesystems/object stores, and, if
the store throttles delete, can dramatically slow down the delete operation.
If the distcp delete operation can build a history of deleted directories, then
it will know when it does not need to issue those deletes.
Care is needed here to make sure that whatever structure is created does not
overload the heap of the process.
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