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Applications can create a BulkDelete instance from a BulkDeleteSource; the BulkDelete interface provides the pageSize(): the maximum number of entries which can be deleted, and a bulkDelete(Collection paths) method which can take a collection up to pageSize() long. This is optimized for object stores with bulk delete APIs; the S3A connector will offer the page size of fs.s3a.bulk.delete.page.size unless bulk delete has been disabled. Even with a page size of 1, the S3A implementation is more efficient than delete(path) as there are no safety checks for the path being a directory or probes for the need to recreate directories. The interface BulkDeleteSource is implemented by all FileSystem implementations, with a page size of 1 and mapped to delete(pathToDelete, false). This means that callers do not need to have special case handling for object stores versus classic filesystems. To aid use through reflection APIs, the class org.apache.hadoop.io.wrappedio.WrappedIO has been created with "reflection friendly" methods. Contributed by Mukund Thakur and Steve Loughran |
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