keith-turner opened a new pull request, #4458:
URL: https://github.com/apache/accumulo/pull/4458

   Scan servers differ from in tablet servers in that they can service scans 
for any tablet, but must read the tablets files and reserve those files to 
prevent the Accumulo GC from removing them.  This happens the first time a 
tablet is read on a scan server and involves reads and writes to the metadata 
table.  This PR is a start at adding metrics related to reservations so that is 
possible to have visibility into the impact of this process on scans.


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