*: modify 'session transaction isolation level' to take effect once #6175
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'session transaction isolation level' is not the same with 'session session transaction isolation level', it should take effect only once to the next transaction.
session/session_fail_test.go
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| // set transaction isolation level read committed take effect just one time. | ||
| tk2.MustExec("update t set v = 43 where k = 1") | ||
| tk1.MustQuery("select v from t where k = 1").Check(testkit.Rows("43")) |
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This test does not verify that the desired isolation level is set.
tiancaiamao
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PTAL @coocood |
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@tiancaiamao |
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LGTM |
sessionctx/variable/session.go
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| @@ -448,6 +457,9 @@ func (s *SessionVars) deleteSystemVar(name string) error { | |||
| // SetSystemVar sets the value of a system variable. | |||
| func (s *SessionVars) SetSystemVar(name string, val string) error { | |||
| switch name { | |||
| case "tx_isolation_one_shot": | |||
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Could we define a constant as tx_isolation_one_shot ?
executor/set.go
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| @@ -150,6 +150,9 @@ func (e *SetExecutor) setSysVariable(name string, v *expression.VarAssignment) e | |||
| return errors.Trace(err) | |||
| } | |||
| oldSnapshotTS := sessionVars.SnapshotTS | |||
| if name == "tx_isolation_one_shot" && sessionVars.InTxn() { | |||
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Could we add a test for it?
| @@ -125,7 +125,13 @@ func (builder *RequestBuilder) SetKeepOrder(order bool) *RequestBuilder { | |||
| } | |||
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| func (builder *RequestBuilder) getIsolationLevel(sv *variable.SessionVars) kv.IsoLevel { | |||
| isoLevel, _ := sv.GetSystemVar(variable.TxnIsolation) | |||
| var isoLevel string | |||
| if sv.TxnIsolationLevelOneShot.State == 2 { | |||
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Why does it need special handling？
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set statement still run into doCommitWithRetry, if I don't maintain a state for tx_isolation_one_shot, it will be reset immediately, in the set statement itself.
@zimulala
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PTAL @zimulala |
zimulala
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/run-all-tests |
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/run-unit-test |
session transaction isolation levelis not the same withsession session transaction isolation level, it should take effectonly once to the next transaction.
@coocood @zz-jason