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Posted to notifications@accumulo.apache.org by "Eric Newton (JIRA)" <ji...@apache.org> on 2015/03/18 22:08:40 UTC

[jira] [Created] (ACCUMULO-3683) Scanner retry time does not back off or include jitter

Eric Newton created ACCUMULO-3683:
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             Summary: Scanner retry time does not back off or include jitter
                 Key: ACCUMULO-3683
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3683
             Project: Accumulo
          Issue Type: Improvement
          Components: client
            Reporter: Eric Newton
            Assignee: Eric Newton
             Fix For: 1.7.0


When a tablet server goes down, scans will begin failing. The {{ThriftScanner}} has a hardcoded 100ms pause between retries.

There are two things that would improve this: an exponential back-off, and some jitter, so the tservers aren't hammering the metadata table with requests for the new location at the same time the master is trying to re-assign the tablets.




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