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IBM Rational ClearCase 7.0: Master the Tools That Monitor, Analyze, and Manage Software Configurations by Tatiana Shpichko, Marc Girod

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Misguided critiques

The subversion Red Book presents some surprising rhetoric in favor of the model it supports. It designates as Lock-Modify-Unlock, the alternative model, which would thus be, for naive readers, this of ClearCase (among other SCM products). The subversion model is elected to similar abstraction under the label: Copy-Modify-Merge. The problems attached, according to subversion authors, to the former model, are fortunately trivially and routinely avoided by ClearCase users: these are problems of the /main/LATEST syndrome, that is, serialization problems bound to the use of one single branch (per element).

A ClearCase model naturally aims at avoiding the negative aspect of locking (in fact reserving in ClearCase terms—locking being ...

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