0c82eb0324
This changes directory tree deletion so that only files are incrementally deleted from S3Guard after the objects are deleted; the directories are left alone until metadataStore.deleteSubtree(path) is invoke. This avoids directory tombstones being added above files/child directories, which stop the treewalk and delete phase from working. Also: * Callback to delete objects splits files and dirs so that any problems deleting the dirs doesn't trigger s3guard updates * New statistic to measure #of objects deleted, alongside request count. * Callback listFilesAndEmptyDirectories renamed listFilesAndDirectoryMarkers to clarify behavior. * Test enhancements to replicate the failure and verify the fix Contributed by Steve Loughran Change-Id: I0e6ea2c35e487267033b1664228c8837279a35c7
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