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Consistency Checking and RUCIO

Consistency Checking and RUCIO. Sarah Williams Indiana University ADC Developers Meeting, 2015-03-09. Topics. Continuing the discussion from ADC Weekly meeting https://indico.cern.ch/event/366305/other-view?view=atlas integration with Rucio support for more SE ( dcache , dpm etc )

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Consistency Checking and RUCIO

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  1. Consistency Checking and RUCIO Sarah Williams Indiana University ADC Developers Meeting, 2015-03-09

  2. Topics • Continuing the discussion from ADC Weekly meeting • https://indico.cern.ch/event/366305/other-view?view=atlas • integration with Rucio • support for more SE (dcache, dpmetc) • extended checks of the files (size, timestamp consistency, checksum etc ..) • reporting and automation of file recovery • reporting of bad files from the job staging

  3. Integration with RUCIO • The plan so far: • Develop agent called rucio-rse-audit, to be distributed with RUCIO tools in CVMFS • Site managers can run the rucio-rse-audit tool at the site to produce a consistency audit report and lists of problem files (missing & dark)

  4. Support for more SE • The tool as written takes as an argument either: • A text file containing a list of files at the site, newline-delimited • A command to run that produces this output • Scripts are available for dCache and DPM to produce these dumps, see: • https://twiki.cern.ch/twiki/bin/viewauth/AtlasComputing/DDMDarkDataCleaning • The tool has extended support for dCache, to check the dCache database against disk. • Requires passwordlessssh access from host running the tool to all dCache servers • Should this be a feature we distribute & support? It’s useful but there is rarely an issue. Requires expertise with dCache. • Could provide internal checks for other storage systems - no

  5. Checking extended attributes • We can check more than whether the file is present or not • size, timestamp, checksum etc … • This requires the site admin to provide us more information in the site dump file. The site dump file will take longer to produce, and more effort to make tools to produce it. • Size is particularly useful. If size is included, we can produce reports like:

  6. Automated Responses to Consistency Check • The process should be thoroughly vetted before any automated action is taken on the results of a consistency check. • For example, the sitemanagerprovides a site dump file that is truncated. Half the site is flagged as missing incorrectly. What happens? • Dark data is easy to delete if the site storage is mounted as a filesystem on the same host as the consistency client • Missing data (and Corrupted data) • Can use the declareRucioFiles.py script to declare the files as bad, or the rucio client command declare_bad_file_replicas. • If dataset dumps are available,can check if the dataset is available at another site, and if so re-subscribe it

  7. Reporting of Bad Files from Input Staging • Is it possible to integrate this with the consistency check? • Download a list of suspect files and flag them for ‘deeper’ checks?

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