Tim Armstrong created IMPALA-9378:
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Summary: CPU usage for runtime profiles with multithreading
Key: IMPALA-9378
URL: https://issues.apache.org/jira/browse/IMPALA-9378
Project: IMPALA
Issue Type: Improvement
Reporter: Tim Armstrong
Assignee: Tim Armstrong
Attachments: coord_q5_dop0.svg, coord_q5_dop16.svg
[~drorke] reports that significant amounts of time can be spent on the runtime
profile with higher values of mt_dop. This can impact query performance from
the client's point of view since profile serialisation is on the critical path
for closing the query. Also serialising the profile for the webserver holds the
ClientRequestState's lock, so can block query progress.
We should figure out how to make this more efficient.
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