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executor: lock duplicated keys on insert-ignore & replace-nothing #42210

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merged 4 commits into from
Mar 15, 2023
Merged

executor: lock duplicated keys on insert-ignore & replace-nothing #42210

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cb49291
executor: lock duplicated keys on insert-ingore & replace-nothing
zyguan Mar 14, 2023
74dda1a
fix unit test
zyguan Mar 14, 2023
d487490
Update executor/insert_common.go
zyguan Mar 14, 2023
b4cda16
Update executor/insert_common.go
zyguan Mar 14, 2023
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12 changes: 12 additions & 0 deletions executor/insert_common.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1207,6 +1207,10 @@ func (e *InsertValues) batchCheckAndInsert(ctx context.Context, rows [][]types.D
}
} else {
e.ctx.GetSessionVars().StmtCtx.AppendWarning(r.handleKey.dupErr)
if txnCtx := e.ctx.GetSessionVars().TxnCtx; txnCtx.IsPessimistic {
// lock duplicated row key on insert-ingore
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txnCtx.AddUnchangedRowKey(r.handleKey.newKey)
}
continue
}
} else if !kv.IsErrNotFound(err) {
Expand Down Expand Up @@ -1239,6 +1243,10 @@ func (e *InsertValues) batchCheckAndInsert(ctx context.Context, rows [][]types.D
} else {
// If duplicate keys were found in BatchGet, mark row = nil.
e.ctx.GetSessionVars().StmtCtx.AppendWarning(uk.dupErr)
if txnCtx := e.ctx.GetSessionVars().TxnCtx; txnCtx.IsPessimistic {
// lock duplicated unique key on insert-ingore
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txnCtx.AddUnchangedRowKey(uk.newKey)
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It seems mysql only locks unique keys as well.

/* init */ select version();
-- init >> +-----------+
-- init    | version() |
-- init    +-----------+
-- init    | 8.0.28    |
-- init    +-----------+
/* init */ drop table if exists t;
-- init >> 0 rows affected
/* init */ create table t (a int primary key, b int unique key, c int);
-- init >> 0 rows affected
/* init */ insert into t values (1, 1, 1);
-- init >> 1 rows affected
/* t1 */ begin;
-- t1 >> 0 rows affected
/* t2 */ begin;
-- t2 >> 0 rows affected
/* t1 */ insert ignore into t values (2, 1, 1);
-- t1 >> 0 rows affected
/* t2 */ select b from t where a = 1 for update;
-- t2 >> +---+
-- t2    | b |
-- t2    +---+
-- t2    | 1 |
-- t2    +---+
/* t2 */ select a from t where b = 1 for update;
-- t2 >> blocked
/* t1 */ commit;
-- t1 >> 0 rows affected
-- t2 >> resumed
-- t2 >> +---+
-- t2    | a |
-- t2    +---+
-- t2    | 1 |
-- t2    +---+
/* t2 */ commit;
-- t2 >> 0 rows affected

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The behaviors of this part are not described in the documents yet, we could add them there.

}
skip = true
break
}
Expand Down Expand Up @@ -1294,6 +1302,10 @@ func (e *InsertValues) removeRow(
if inReplace {
e.ctx.GetSessionVars().StmtCtx.AddAffectedRows(1)
}
_, err := appendUnchangedRowForLock(e.ctx, r.t, handle, oldRow)
if err != nil {
return false, err
}
return true, nil
}

Expand Down
66 changes: 66 additions & 0 deletions executor/insert_test.go
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Expand Up @@ -1509,3 +1509,69 @@ func TestIssue32213(t *testing.T) {
tk.MustQuery("select cast(test.t1.c1 as decimal(5, 3)) from test.t1").Check(testkit.Rows("99.999"))
tk.MustQuery("select cast(test.t1.c1 as decimal(6, 3)) from test.t1").Check(testkit.Rows("100.000"))
}

func TestInsertLock(t *testing.T) {
store := testkit.CreateMockStore(t)
tk1 := testkit.NewTestKit(t, store)
tk2 := testkit.NewTestKit(t, store)
tk1.MustExec("use test")
tk2.MustExec("use test")

for _, tt := range []struct {
name string
ddl string
dml string
}{
{
"replace-pk",
"create table t (c int primary key clustered)",
"replace into t values (1)",
},
{
"replace-uk",
"create table t (c int unique key)",
"replace into t values (1)",
},
{
"insert-ingore-pk",
"create table t (c int primary key clustered)",
"insert ignore into t values (1)",
},
{
"insert-ingore-uk",
"create table t (c int unique key)",
"insert ignore into t values (1)",
},
{
"insert-update-pk",
"create table t (c int primary key clustered)",
"insert into t values (1) on duplicate key update c = values(c)",
},
{
"insert-update-uk",
"create table t (c int unique key)",
"insert into t values (1) on duplicate key update c = values(c)",
},
} {
t.Run(tt.name, func(t *testing.T) {
tk1.MustExec("drop table if exists t")
tk1.MustExec(tt.ddl)
tk1.MustExec("insert into t values (1)")
tk1.MustExec("begin")
tk1.MustExec(tt.dml)
done := make(chan struct{})
go func() {
tk2.MustExec("delete from t")
done <- struct{}{}
}()
select {
case <-done:
require.Failf(t, "txn2 is not blocked by %q", tt.dml)
case <-time.After(100 * time.Millisecond):
}
tk1.MustExec("commit")
<-done
tk1.MustQuery("select * from t").Check([][]interface{}{})
})
}
}
36 changes: 20 additions & 16 deletions executor/write.go
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Original file line number Diff line number Diff line change
Expand Up @@ -137,22 +137,8 @@ func updateRecord(ctx context.Context, sctx sessionctx.Context, h kv.Handle, old
if sctx.GetSessionVars().ClientCapability&mysql.ClientFoundRows > 0 {
sc.AddAffectedRows(1)
}

physicalID := t.Meta().ID
if pt, ok := t.(table.PartitionedTable); ok {
p, err := pt.GetPartitionByRow(sctx, oldData)
if err != nil {
return false, err
}
physicalID = p.GetPhysicalID()
}

unchangedRowKey := tablecodec.EncodeRowKeyWithHandle(physicalID, h)
txnCtx := sctx.GetSessionVars().TxnCtx
if txnCtx.IsPessimistic {
txnCtx.AddUnchangedRowKey(unchangedRowKey)
}
return false, nil
_, err := appendUnchangedRowForLock(sctx, t, h, oldData)
return false, err
}

// Fill values into on-update-now fields, only if they are really changed.
Expand Down Expand Up @@ -229,6 +215,24 @@ func updateRecord(ctx context.Context, sctx sessionctx.Context, h kv.Handle, old
return true, nil
}

func appendUnchangedRowForLock(sctx sessionctx.Context, t table.Table, h kv.Handle, row []types.Datum) (bool, error) {
txnCtx := sctx.GetSessionVars().TxnCtx
if !txnCtx.IsPessimistic {
return false, nil
}
physicalID := t.Meta().ID
if pt, ok := t.(table.PartitionedTable); ok {
p, err := pt.GetPartitionByRow(sctx, row)
if err != nil {
return false, err
}
physicalID = p.GetPhysicalID()
}
unchangedRowKey := tablecodec.EncodeRowKeyWithHandle(physicalID, h)
txnCtx.AddUnchangedRowKey(unchangedRowKey)
return true, nil
}

func rebaseAutoRandomValue(ctx context.Context, sctx sessionctx.Context, t table.Table, newData *types.Datum, col *table.Column) error {
tableInfo := t.Meta()
if !tableInfo.ContainsAutoRandomBits() {
Expand Down