[GitHub] [accumulo] keith-turner opened a new pull request #1440: Give scans control over cache via scan dispatchers #1383

[GitBox <gi...@apache.org>]

keith-turner opened a new pull request #1440: Give scans control over cache via scan dispatchers #1383
URL: https://github.com/apache/accumulo/pull/1440
 
 
   This commit enables per scan control over cache usages.  This was done
   via extending the scope of ScanDispatchers to include cache control.
   
   The built in SimpleScanDispatcher was improved to support mapping
   scanner execution hints of the form scan_type=X to
   cache usage directives for a scan.
   
   Accumulo caches open files.  Before this change the cache was bound to
   the file when it was opened.  Now a cache can be bound to an already
   open file. The internal interface CacheProvider was created to
   facilitate this.

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