Dispatcher Phase 1#12801

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raghavsethi wants to merge 17 commits intoprestodb:masterfrom

raghavsethi:dispatcher-final-rebase

Commits on May 16, 2019

Add query id to NoSuchElementException

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Remove system startup minimum worker requirement

dain
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Add DISPATCHING query states

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Split out queued phase from QueryManager

dain
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Add LocalCoordinatorLocation

dain
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Improve query event stats for immediately failed queries

dain
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Remove Optional from QueryStateMachine resourceGroup

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Simplify DispatchInfo construction

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Rename SqlQueryManagerStats to QueryManagerStats

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Simplify query manager stats tracking

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Fix handling of failures during query creation

dain
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Cleanup dispatcher executor management

dain
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Change local dispatch to finish immediately after query submission

dain
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Catch errors from LocalDispatchQuery querySubmitter

dain
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Fix result caching in protocol Query

dain
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Simplify token management in protocol Query

dain
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raghavsethi
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Change QueryStateTimer to not produce negative timings
raghavsethi
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