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br: use one shot session to close domain ASAP (#36558) #36592
base: release-5.4
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cherry-pick #36558 to release-5.4
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# In tidb repo: git pr https://github.com/pingcap/tidb/pull/36592
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What problem does this PR solve?
Issue Number: ref #36546
Problem Summary:
when we use
createSession
, the side effect is it will create a domain internally bykv.store
. even if we drop the session the domain still exists during the whole backup. and when the domain exists, it will put an empty ip address node to etcd. this will cause the in-memory cop request slow down.What is changed and how it works?
I add a function to close domain when finished
getGlobalVariable
/getDDLJobs
during backup to reduce the time of hold domain/session during backup.Check List
Tests
before this PR, when BR getting in stuck. we can see two server info keys.
with this PR, when BR getting in stuck. we can see only one server info key and in log we can check the log "one shot domain closed"
Side effects
Documentation
Release note
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