Keith Turner created ACCUMULO-628:
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             Summary: tablet last location deleted and set
                 Key: ACCUMULO-628
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-628
             Project: Accumulo
          Issue Type: Bug
          Components: tserver
    Affects Versions: 1.4.0, 1.3.5
            Reporter: Keith Turner
            Assignee: Keith Turner


While doing some experiments related to ACCUMULO-549 I was looking at 
mutations.  I noticed the following mutation and thought it was odd that it was 
deleting and setting the last location.  The delete will win because it sorts 
first.  Looking at the code this happens on the first compaction after tablet 
load when the last and current location are the same.  Need a check to make the 
delete conditional and only do it when last and current differ.

{noformat}
1 mutations:
  2<
      file:/default_tablet/F0000000.rf [system]:45 [] <deleted>
      file:/t-0000002/F0000005.rf [system]:45 [] <deleted>
      file:/t-0000003/F0000006.rf [system]:45 [] <deleted>
      file:/default_tablet/A0000007.rf [system]:45 [] 227,3
      srv:compact [system]:45 [] 0
      last:137c84429e10002 [system]:45 [] <deleted>
      last:137c84429e10002 [system]:45 [] 127.0.0.1:40200
      srv:lock [system]:45 [] 
tservers/127.0.0.1:40200/zlock-0000000000$137c84429e10002
{noformat}

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