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store: implement non-block read when coprocessor meets the lock of a …
…large transaction (#11986)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| // Copyright 2019-present, PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package mocktikv_test | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
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| . "github.com/pingcap/check" | ||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/kvproto/pkg/kvrpcpb" | ||
| "github.com/pingcap/parser/model" | ||
| "github.com/pingcap/tidb/domain" | ||
| "github.com/pingcap/tidb/kv" | ||
| "github.com/pingcap/tidb/session" | ||
| "github.com/pingcap/tidb/store/mockstore" | ||
| "github.com/pingcap/tidb/store/mockstore/mocktikv" | ||
| "github.com/pingcap/tidb/tablecodec" | ||
| "github.com/pingcap/tidb/util/testkit" | ||
| ) | ||
|
|
||
| var _ = Suite(&testExecutorSuite{}) | ||
|
|
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| type testExecutorSuite struct { | ||
| cluster *mocktikv.Cluster | ||
| store kv.Storage | ||
| mvccStore mocktikv.MVCCStore | ||
| dom *domain.Domain | ||
| } | ||
|
|
||
| func (s *testExecutorSuite) SetUpSuite(c *C) { | ||
| s.cluster = mocktikv.NewCluster() | ||
| mocktikv.BootstrapWithSingleStore(s.cluster) | ||
| s.mvccStore = mocktikv.MustNewMVCCStore() | ||
| store, err := mockstore.NewMockTikvStore( | ||
| mockstore.WithCluster(s.cluster), | ||
| mockstore.WithMVCCStore(s.mvccStore), | ||
| ) | ||
| c.Assert(err, IsNil) | ||
| s.store = store | ||
| session.SetSchemaLease(0) | ||
| session.DisableStats4Test() | ||
| s.dom, err = session.BootstrapSession(s.store) | ||
| c.Assert(err, IsNil) | ||
| } | ||
|
|
||
| func (s *testExecutorSuite) TearDownSuite(c *C) { | ||
| s.dom.Close() | ||
| s.store.Close() | ||
| } | ||
|
|
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| func (s *testExecutorSuite) TestResolvedLargeTxnLocks(c *C) { | ||
| // This test checks the resolve lock functionality. | ||
| // When a txn meets the lock of a large transaction, it should not block by the | ||
| // lock. | ||
| tk := testkit.NewTestKit(c, s.store) | ||
| tk.MustExec("use test") | ||
| tk.MustExec("create table t (id int primary key, val int)") | ||
| dom := domain.GetDomain(tk.Se) | ||
| schema := dom.InfoSchema() | ||
| tbl, err := schema.TableByName(model.NewCIStr("test"), model.NewCIStr("t")) | ||
| c.Assert(err, IsNil) | ||
|
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| tk.MustExec("insert into t values (1, 1)") | ||
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| oracle := s.store.GetOracle() | ||
| tso, err := oracle.GetTimestamp(context.Background()) | ||
| c.Assert(err, IsNil) | ||
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| key := tablecodec.EncodeRowKeyWithHandle(tbl.Meta().ID, 1) | ||
| pairs := s.mvccStore.Scan(key, nil, 1, tso, kvrpcpb.IsolationLevel_SI, nil) | ||
| c.Assert(pairs, HasLen, 1) | ||
| c.Assert(pairs[0].Err, IsNil) | ||
|
|
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| // Simulate a large txn (holding a pk lock with large TTL). | ||
| // Secondary lock 200ms, primary lock 100s | ||
| mocktikv.MustPrewriteOK(c, s.mvccStore, mocktikv.PutMutations("primary", "value"), "primary", tso, 100000) | ||
| mocktikv.MustPrewriteOK(c, s.mvccStore, mocktikv.PutMutations(string(key), "value"), "primary", tso, 200) | ||
|
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| // Simulate the action of reading meet the lock of a large txn. | ||
| // The lock of the large transaction should not block read. | ||
| // The first time, this query should meet a lock on the secondary key, then resolve lock. | ||
| // After that, the query should read the previous version data. | ||
| tk.MustQuery("select * from t").Check(testkit.Rows("1 1")) | ||
|
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| // And check the large txn is still alive. | ||
| pairs = s.mvccStore.Scan([]byte("primary"), nil, 1, tso, kvrpcpb.IsolationLevel_SI, nil) | ||
| c.Assert(pairs, HasLen, 1) | ||
| _, ok := errors.Cause(pairs[0].Err).(*mocktikv.ErrLocked) | ||
| c.Assert(ok, IsTrue) | ||
| } |
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