ddl: fix panic tidb-server doesn't release table lock (#19586) #20021
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Signed-off-by: crazycs520 <crazycs520@gmail.com>
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…ot/tidb into release-3.0-8ae5b1cfd12f
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bb7133
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Sep 17, 2020
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bb7133
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cherry-pick #19586 to release-3.0
What problem does this PR solve?
Close #19240
When
tidb-serverbeenkilled -9(such as oom that killed by the system), the tidb-server won't release the held table locks, and thisdeadtable lock will never be released unless user useadmin cleanup table lockstatement.What is changed and how it works?
Add a background goroutine to periodic inspection the
deadlock.If the lock is held by the server that doesn't exist meta key (such as
DDLAllSchemaVersionsmeta key) in ETCD, we think the server is dead, so we can clean the locks that hold by the dead tidb-server.Why use
DDLAllSchemaVersionsmeta key instead ofServerInformationPathmeta key?Table lockimplementation with DDL, andDDLAllSchemaVersionsmeta key is a related DDL meta key.DDLAllSchemaVersionsTTL is 90s, butServerInformationPathTTL is 10 min. The TTL90sis much better for usage.Related changes
Check List
Tests
Side effects
Release note