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Why is the number of files selected smaller then the number of files returned by the file catalog?

April 26, 2017catalog file files RETURNED Selected smaller

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Why is the number of files selected smaller then the number of files returned by the file catalog?

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This is because some files may not be able to be accessed, such as files on HPSS when not using xrootd. Duplicate files are also dropped so two or more of the same file returned at more then one location are not counted twice.