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staleread, session: internal write request should be accepted with external ts (#39967) #40005

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staleread, session: internal write request should be accepted with external ts (#39967) #40005

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2 changes: 1 addition & 1 deletion session/session.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2242,7 +2242,7 @@ func (s *session) onTxnManagerStmtStartOrRetry(ctx context.Context, node ast.Stm

func (s *session) validateStatementReadOnlyInStaleness(stmtNode ast.StmtNode) error {
vars := s.GetSessionVars()
if !vars.TxnCtx.IsStaleness && vars.TxnReadTS.PeakTxnReadTS() == 0 && !vars.EnableExternalTSRead {
if !vars.TxnCtx.IsStaleness && vars.TxnReadTS.PeakTxnReadTS() == 0 && !vars.EnableExternalTSRead || vars.InRestrictedSQL {
return nil
}
errMsg := "only support read-only statement during read-only staleness transactions"
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10 changes: 10 additions & 0 deletions sessiontxn/staleread/externalts_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,10 @@
package staleread_test

import (
"context"
"testing"

"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/parser/auth"
"github.com/pingcap/tidb/testkit"
"github.com/stretchr/testify/require"
Expand Down Expand Up @@ -67,12 +69,20 @@ func TestExternalTimestampReadonly(t *testing.T) {
tk.MustQuery("select @@tidb_external_ts").Check(testkit.Rows("0"))
tk.MustExec("start transaction;set global tidb_external_ts=@@tidb_current_ts;commit;")

// with tidb_enable_external_ts_read enabled, this session will be readonly
tk.MustExec("set tidb_enable_external_ts_read=ON")
_, err := tk.Exec("insert into t values (0)")
require.Error(t, err)

tk.MustExec("set tidb_enable_external_ts_read=OFF")
tk.MustExec("insert into t values (0)")

// even when tidb_enable_external_ts_read is enabled, internal SQL will not be affected
tk.MustExec("set tidb_enable_external_ts_read=ON")
tk.Session().GetSessionVars().InRestrictedSQL = true
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnOthers)
tk.MustExecWithContext(ctx, "insert into t values (1)")
tk.Session().GetSessionVars().InRestrictedSQL = false
}

func TestExternalTimestampReadWithTransaction(t *testing.T) {
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