Difference: FileSummaryRecord (6 vs. 7)

Revision 72014-04-01 - RobLambert

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META TOPICPARENT name="LHCbComputing"

LHCb File Summary Record

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  • A new "event" store: since Root files have no concept of metadata, and Gaudi did not have a concept of metadata either, we implemented FSRs as a secondary event store, a new tree kept in the same root file, starting with "FileRecords"
  • New DataObjects: since Gaudi can only write DataObjects to Root files using the existing framework, we needed to add every metadata concept we can think of into the event class model, creating dedicated DataObjects
  • New services/algorithms: this datastore needs algorithms which fill it, and services which provide accessors to the data.
Changed:
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  • Automatic Propagation: FSRs are expected to be transparently passed from file to file hand-over-hand by the dedicated services. File metadata only increases and
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  • Automatic Propagation: FSRs are expected to be transparently passed from file to file hand-over-hand by the dedicated services. File metadata only increases, and is preserved in a tree structure using the GUID of the input files as directories.
 

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