271 lines
9.7 KiB
Go
271 lines
9.7 KiB
Go
// Copyright 2018 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package session_test
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import (
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"time"
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. "github.com/pingcap/check"
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"github.com/pingcap/tidb/domain"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/session"
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"github.com/pingcap/tidb/store/mockstore"
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"github.com/pingcap/tidb/store/mockstore/mocktikv"
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"github.com/pingcap/tidb/util/testkit"
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"github.com/pingcap/tidb/util/testleak"
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)
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var _ = Suite(&testIsolationSuite{})
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type testIsolationSuite struct {
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cluster *mocktikv.Cluster
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mvccStore mocktikv.MVCCStore
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store kv.Storage
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dom *domain.Domain
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}
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func (s *testIsolationSuite) SetUpSuite(c *C) {
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testleak.BeforeTest()
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s.cluster = mocktikv.NewCluster()
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mocktikv.BootstrapWithSingleStore(s.cluster)
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s.mvccStore = mocktikv.MustNewMVCCStore()
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store, err := mockstore.NewMockTikvStore(
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mockstore.WithCluster(s.cluster),
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mockstore.WithMVCCStore(s.mvccStore),
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)
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c.Assert(err, IsNil)
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s.store = store
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session.SetSchemaLease(0)
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session.DisableStats4Test()
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s.dom, err = session.BootstrapSession(s.store)
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c.Assert(err, IsNil)
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tk := testkit.NewTestKitWithInit(c, s.store)
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tk.MustExec("set @@global.tidb_retry_limit = 0")
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time.Sleep(3 * time.Second)
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}
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func (s *testIsolationSuite) TearDownSuite(c *C) {
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tk := testkit.NewTestKitWithInit(c, s.store)
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tk.MustExec("set @@global.tidb_retry_limit = 10")
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s.dom.Close()
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s.store.Close()
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testleak.AfterTest(c)()
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}
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/*
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These test cases come from the paper <A Critique of ANSI SQL Isolation Levels>.
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The sign 'P0', 'P1'.... can be found in the paper. These cases will run under snapshot isolation.
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*/
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func (s *testIsolationSuite) TestP0DirtyWrite(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("begin;")
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session1.MustExec("update x set c = c+1 where id = 1;")
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session2.MustExec("begin;")
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session2.MustExec("update x set c = c+1 where id = 1;")
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session1.MustExec("commit;")
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_, err := session2.Exec("commit;")
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c.Assert(err, NotNil)
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}
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func (s *testIsolationSuite) TestP1DirtyRead(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("begin;")
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session1.MustExec("update x set c = c+1 where id = 1;")
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session2.MustExec("begin;")
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session2.MustQuery("select c from x where id = 1;").Check(testkit.Rows("1"))
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session1.MustExec("commit;")
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session2.MustExec("commit;")
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}
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func (s *testIsolationSuite) TestP2NonRepeatableRead(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("drop table if exists y;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("create table y (id int primary key, c int);")
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session1.MustExec("insert into y values(1, 1);")
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session1.MustExec("begin;")
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session2.MustExec("begin;")
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session1.MustQuery("select c from x where id = 1;").Check(testkit.Rows("1"))
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session2.MustQuery("select c from x where id = 1;").Check(testkit.Rows("1"))
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session2.MustExec("update x set c = c+1 where id = 1;")
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session2.MustQuery("select c from y where id = 1;").Check(testkit.Rows("1"))
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session2.MustExec("update y set c = c+1 where id = 1;")
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session2.MustExec("commit;")
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session1.MustQuery("select c from y where id = 1;").Check(testkit.Rows("1"))
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session1.MustExec("commit;")
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}
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func (s *testIsolationSuite) TestP3Phantom(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("drop table if exists z;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("create table z (id int primary key, c int);")
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session1.MustExec("insert into z values(1, 1);")
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session1.MustExec("begin;")
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session2.MustExec("begin;")
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session1.MustQuery("select c from x where id < 5;").Check(testkit.Rows("1"))
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session2.MustExec("insert into x values(2, 1);")
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session2.MustQuery("select c from z where id = 1;").Check(testkit.Rows("1"))
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session2.MustExec("update z set c = c+1 where id = 1;")
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session2.MustExec("commit;")
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session1.MustQuery("select c from z where id = 1;").Check(testkit.Rows("1"))
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session1.MustExec("commit;")
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}
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func (s *testIsolationSuite) TestP4LostUpdate(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("begin;")
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session1.MustQuery("select c from x where id = 1;").Check(testkit.Rows("1"))
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session2.MustExec("begin;")
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session2.MustQuery("select c from x where id = 1;").Check(testkit.Rows("1"))
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session2.MustExec("update x set c = c+1 where id = 1;")
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session2.MustExec("commit;")
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session1.MustExec("update x set c = c+1 where id = 1;")
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_, err := session1.Exec("commit;")
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c.Assert(err, NotNil)
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}
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// cursor is not supported
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func (s *testIsolationSuite) TestP4CLostUpdate(c *C) {}
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func (s *testIsolationSuite) TestA3Phantom(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("begin;")
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session2.MustExec("begin;")
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session2.MustQuery("select c from x where id < 5;").Check(testkit.Rows("1"))
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session1.MustExec("insert into x values(2, 1);")
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session1.MustExec("commit;")
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session2.MustQuery("select c from x where id < 5;").Check(testkit.Rows("1"))
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session2.MustExec("commit;")
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}
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func (s *testIsolationSuite) TestA5AReadSkew(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("drop table if exists y;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("create table y (id int primary key, c int);")
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session1.MustExec("insert into y values(1, 1);")
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session1.MustExec("begin;")
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session2.MustExec("begin;")
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session1.MustQuery("select c from x where id = 1;").Check(testkit.Rows("1"))
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session2.MustExec("update x set c = c+1 where id = 1;")
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session2.MustExec("update y set c = c+1 where id = 1;")
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session2.MustExec("commit;")
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session1.MustQuery("select c from y where id = 1;").Check(testkit.Rows("1"))
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session1.MustExec("commit;")
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}
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func (s *testIsolationSuite) TestA5BWriteSkew(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("drop table if exists y;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("create table y (id int primary key, c int);")
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session1.MustExec("insert into y values(1, 1);")
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session1.MustExec("begin;")
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session2.MustExec("begin;")
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session1.MustQuery("select c from x where id = 1;").Check(testkit.Rows("1"))
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session2.MustQuery("select c from y where id = 1;").Check(testkit.Rows("1"))
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session1.MustExec("update y set c = c+1 where id = 1;")
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session2.MustExec("update x set c = c+1 where id = 1;")
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session2.MustExec("commit;")
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session1.MustExec("commit;")
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}
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/*
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These test cases come from the paper <Highly Available Transactions: Virtues and Limitations>
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for tidb, we support read-after-write on cluster level.
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*/
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func (s *testIsolationSuite) TestReadAfterWrite(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("begin;")
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session1.MustExec("update x set c = c+1 where id = 1;")
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session1.MustExec("commit;")
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session1.MustExec("begin;")
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session2.MustQuery("select c from x where id = 1;").Check(testkit.Rows("2"))
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session2.MustExec("commit;")
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}
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/*
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This case will do harm in Innodb, even if in snapshot isolation, but harmless in tidb.
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*/
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func (s *testIsolationSuite) TestPhantomReadInInnodb(c *C) {
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session1 := testkit.NewTestKitWithInit(c, s.store)
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session2 := testkit.NewTestKitWithInit(c, s.store)
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session1.MustExec("drop table if exists x;")
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session1.MustExec("create table x (id int primary key, c int);")
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session1.MustExec("insert into x values(1, 1);")
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session1.MustExec("begin;")
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session1.MustQuery("select c from x where id < 5;").Check(testkit.Rows("1"))
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session2.MustExec("begin;")
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session2.MustExec("insert into x values(2, 1);")
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session2.MustExec("commit;")
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session1.MustExec("update x set c = c+1 where id < 5;")
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session1.MustQuery("select c from x where id < 5;").Check(testkit.Rows("2"))
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session1.MustExec("commit;")
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}
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