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Last update: Apr 1, 2000

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Building a large location table to find replicas of physics objects

Koen Holtman, Heinz Stockinger

Speaker: Koen Holtman

  The problem of building a large location table for physics objects occurs within a number of planned physics data management systems, like those that control reclustering and wide-area replication. To satisfy their efficiency goals, these systems have to make local or remote replicas of individual physics objects, which contain raw or reconstructed data for a single event, rather than replicas of large run or ntuple files. This replication implies the use of a table to resolve the logical, location independent object descriptor into a physical location where an object replica can be found. For modern physics experiments the table needs to scale to at least some 10**10 objects. We argue that such a table can be efficiently implemented by limiting the freedom of lookup operations, and by exploiting some specific properties of the physics data model. One specific viable implementation is discussed in detail, and the results of performance tests are shown.

Presentation:  PowerPoint Short Paper:  Adobe Acrobat pdf 

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