NOvA Operations » NOvA Data Quality

On Sep 9, 2014, at 10:51 AM, Michael Baird wrote:

---- FileOpenError BEGIN
Unable to open file /data2/NearDet/neardet_r00010408_s02_t00.raw due to system error, "Success"
cet::exception caught in EventProcessor and rethrown
---- FileOpenError END

I've seen this before. I think it is caused by an empty or very small raw file (256 bytes or less.) This can happen if there are no triggers of a given type (in this case the numi triggers) but data logger is still trying to write that trigger stream to disk. Data logger will drop a very small file to disk that contains no events and trying to process it (I think) will produce the above error. This might cause a problem as the OnMon jobs (which are trying to process both triggers) will crash when it hits this file. Data logger probably shouldn't be writing those empty trigger files to disk but that is a question for the DAQ group. You should verify that this is the problem.

---- CatalogServiceError BEGIN
Input file not found: /data2/NearDet/neardet_r00010408_s14_t02.raw_t00.raw.
cet::exception caught in EventProcessor and rethrown
---- CatalogServiceError END

This one is caused by a logic error in the ProcessSingleOnMonFile script. Hayes is looking into it.

---- FileOpenError BEGIN
Unable to open file /data2/NearDet/neardet_r00010408_s02_t00.raw due to system error, "Success"
cet::exception caught in EventProcessor and rethrown
---- FileOpenError END

Is a common Error when files are empty

---- CatalogServiceError BEGIN
Input file not found: /data2/NearDet/neardet_r00010408_s14_t02.raw_t00.raw.
cet::exception caught in EventProcessor and rethrown
---- CatalogServiceError END

Fixed by changing ProcessNew and ProcessSingle scripts to look for t02 files, then change t02 for {t00,t02} in the filenames before processing

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