executor: kill tableReader for each connection correctly (#18277) #18505
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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@fzhedu please accept the invitation then you can push to the cherry-pick pull requests. |
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SunRunAway
approved these changes
Jul 15, 2020
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cherry-pick #18277 to release-4.0
What problem does this PR solve?
Issue Number: close a part of #18057
Problem Summary:
The tableReader in the coprocessor may retry many times to read regions, druing which, it cannot be aware of the cancelation from client. It may take much of memory for a long time.
What is changed and how it works?
Proposal: detect
Killedto stop the goroutine.What's Changed: should not use
CompareAndSwapto change theKilledbefore Close(), because many runninig goroutines should detect theKilled.How it Works: the TableReader the detect the
killedin every loop.The query may not exit quickly, because the query do some close work.
Check List
Tests
test on mocktikv:
similarly test on TiFlash is ok.
Release note