Commits on Feb 20, 2020

1. Fix versioned namespace clears …

   When using namespace versioning to achieve atomic cache clears, only
   delete cache keys matching the old/current version.
   
   This resolves tag inconsistency issues whereby the process running the
   clear would delete keys set against the new version by more recently
   spawned concurreny processes. Most seriously this could result in newly
   set data keys remaining, but with empty associated tag sets meaning the
   invalidation via tags was no longer possible.
   
   Clearing specific prefixes is not supported when using versioned
   namespaces as it is desirable to clear all old keys as they will no
   longer be used and would otherwise eventually fill cache memory.

   Trevor North committed Feb 20, 2020
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   971b177 View commit details

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