Keith Turner created ACCUMULO-4799:
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             Summary: In tablet server start scan authenticates twice
                 Key: ACCUMULO-4799
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4799
             Project: Accumulo
          Issue Type: Improvement
    Affects Versions: 1.8.1, 1.7.3
            Reporter: Keith Turner
             Fix For: 1.9.0, 2.0.0


The code that handles a start scan RPC call checks authentication twice.  Each 
call to authenticate takes a bit of time.  It would be nice if it only did it 
once.

At [TabletServer line 
479|https://github.com/apache/accumulo/blob/rel/1.8.1/server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java#L479]
 a call to canScan is made which calls authenticate.  Then at [TabletServer 
line 
482|https://github.com/apache/accumulo/blob/rel/1.8.1/server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java#L482]
 a call to check authorizations is made which also authenticates.  



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