cshannon opened a new pull request, #5153:
URL: https://github.com/apache/accumulo/pull/5153

   Previously the conditional mutation to commit a compaction would require all 
files in the tablet be the same as read earlier and on a busy tablet this could 
fail and retry often. The check has now been narrowed to only verify that the 
files involved with the compaction still exist. A new method was added to Ample 
called requireFiles(Set<StoredTabletFile> files) which creates a condition for 
each file column to verify each one exists.
   
   This closes #5117


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