Thomas Tauber-Marshall created IMPALA-10204:
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Summary: Evaluate AdmitQuery params for efficiency
Key: IMPALA-10204
URL: https://issues.apache.org/jira/browse/IMPALA-10204
Project: IMPALA
Issue Type: Sub-task
Components: Distributed Exec
Reporter: Thomas Tauber-Marshall
In the first version of the AdmissionControlService, we're sending the entire
TQueryExecRequest/TQueryOptions as a sidecar to the admission controller. There
are various things contained in the TQueryExecRequest/TQueryOptions that are
not actually needed by the admission controller, and sending them increases
network load and query running time unnecessarily.
We should evaluate how much of a perf impact there is due to this and how much
could actually be removed.
Some small things may be non-trivial to remove and ultimately not worth it, for
example the tree of TPlanNodes contains some info needed by the admission
controller (eg. memory estimates) and some things that are not (eg. runtime
filter descriptors). Making two parallel trees, one with only
admission-required data (which would require extensive refactoring in the
planner or wasted work in the coordinator copying out the required parts from
what the planner returns) may be too complicated/introduce too much other
overhead to be worth it.
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