gaborgsomogyi commented on issue #26590: [SPARK-29953][SS] Don't clean up source files for FileStreamSource if the files belong to the output of FileStreamSink URL: https://github.com/apache/spark/pull/26590#issuecomment-556027500 > To simplify the condition, this patch assumes that if the source files belong to the FileStreamSink, the matched source path is the root of output directory for FileStreamSink. For example, suppose we provide a glob path /a/b/c/*/* and FileStreamSource processes the file /a/b/c/d/e/f/g/file. Then we only check /a/b/c/d/e to see whether there's FileStreamSink metadata log available. As a user I may have a directory structured where `/a/b/_spark_metadata` exists (or even `/a/_spark_metadata`). Such case I would be grateful to Spark to protect me from accidental file delete/move.
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