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HBASE-23285 LogCleaner should not delete empty oldWALs/rs directories…

11

HBASE-14247 Add a new config hbase.separate.oldlogdir.by.regionserver, the old wal dir will be separated by regionservers. But,if there are no files, the regionserver directory will be cleared. CommonFSUtils.renameAndSetModifyTime(this.fs, p, newPath) will...