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      The execution-related rpcs in ImpalaInternalService (ExecPlanFragment, CancelPlanFragment) are currently fragment-instance oriented. This is very inefficient because a) starting up a single query involves lots of rpcs, b) it makes it hard to share query-wide data structures such as the descriptor table.

      Instead, let's move to a per-query focus and replace the existing "execute" and "cancel" rpcs with per-query equivalents.

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            marcelk Marcel Kinard
            henryr Henry Robinson
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