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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-1370) Improve fragment staging
Date Wed, 03 Sep 2014 20:09:51 GMT
Jacques Nadeau created DRILL-1370:
-------------------------------------

             Summary: Improve fragment staging
                 Key: DRILL-1370
                 URL: https://issues.apache.org/jira/browse/DRILL-1370
             Project: Apache Drill
          Issue Type: Improvement
          Components: Execution - Flow
            Reporter: Jacques Nadeau
            Assignee: Steven Phillips
             Fix For: 0.6.0


Drill optimistically executes all major fragments of a query. In some situations, this greedy
behavior is too optimistic, which causes portions of the query to swamp the IO path too early,
starving earlier phases of the query.  Our RPC backpressure should help manage this.  However,
with a high level of parallelization, the back pressure is too lenient. 



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