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executor: trace and control memory usage in DistSQL layer (pingcap#10003
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,235 @@ | ||
| // Copyright 2019 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 executor_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| . "github.com/pingcap/check" | ||
| "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/store/tikv" | ||
| "github.com/pingcap/tidb/store/tikv/tikvrpc" | ||
| "github.com/pingcap/tidb/tablecodec" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/codec" | ||
| "github.com/pingcap/tidb/util/testkit" | ||
| ) | ||
|
|
||
| var ( | ||
| _ = Suite(&testChunkSizeControlSuite{}) | ||
| ) | ||
|
|
||
| type testSlowClient struct { | ||
| sync.RWMutex | ||
| tikv.Client | ||
| regionDelay map[uint64]time.Duration | ||
| } | ||
|
|
||
| func (c *testSlowClient) SendRequest(ctx context.Context, addr string, req *tikvrpc.Request, timeout time.Duration) (*tikvrpc.Response, error) { | ||
| regionID := req.RegionId | ||
| delay := c.GetDelay(regionID) | ||
| if req.Type == tikvrpc.CmdCop && delay > 0 { | ||
| time.Sleep(delay) | ||
| } | ||
| return c.Client.SendRequest(ctx, addr, req, timeout) | ||
| } | ||
|
|
||
| func (c *testSlowClient) SetDelay(regionID uint64, dur time.Duration) { | ||
| c.Lock() | ||
| defer c.Unlock() | ||
| c.regionDelay[regionID] = dur | ||
| } | ||
|
|
||
| func (c *testSlowClient) GetDelay(regionID uint64) time.Duration { | ||
| c.RLock() | ||
| defer c.RUnlock() | ||
| return c.regionDelay[regionID] | ||
| } | ||
|
|
||
| // manipulateCluster splits this cluster's region by splitKeys and returns regionIDs after split | ||
| func manipulateCluster(cluster *mocktikv.Cluster, splitKeys [][]byte) []uint64 { | ||
| regions := cluster.GetAllRegions() | ||
| if len(regions) != 1 { | ||
| panic("this cluster has already split") | ||
| } | ||
|
|
||
| allRegionIDs := []uint64{regions[0].Meta.Id} | ||
| for i, key := range splitKeys { | ||
| newRegionID, newPeerID := cluster.AllocID(), cluster.AllocID() | ||
| cluster.Split(allRegionIDs[i], newRegionID, key, []uint64{newPeerID}, newPeerID) | ||
| allRegionIDs = append(allRegionIDs, newRegionID) | ||
| } | ||
| return allRegionIDs | ||
| } | ||
|
|
||
| func generateTableSplitKeyForInt(tid int64, splitNum []int) [][]byte { | ||
| results := make([][]byte, 0, len(splitNum)) | ||
| for _, num := range splitNum { | ||
| results = append(results, tablecodec.EncodeRowKey(tid, codec.EncodeInt(nil, int64(num)))) | ||
| } | ||
| return results | ||
| } | ||
|
|
||
| func generateIndexSplitKeyForInt(tid, idx int64, splitNum []int) [][]byte { | ||
| results := make([][]byte, 0, len(splitNum)) | ||
| for _, num := range splitNum { | ||
| d := new(types.Datum) | ||
| d.SetInt64(int64(num)) | ||
| b, err := codec.EncodeKey(nil, nil, *d) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| results = append(results, tablecodec.EncodeIndexSeekKey(tid, idx, b)) | ||
| } | ||
| return results | ||
| } | ||
|
|
||
| type testChunkSizeControlKit struct { | ||
| store kv.Storage | ||
| dom *domain.Domain | ||
| tk *testkit.TestKit | ||
| client *testSlowClient | ||
| cluster *mocktikv.Cluster | ||
| } | ||
|
|
||
| type testChunkSizeControlSuite struct { | ||
| m map[string]*testChunkSizeControlKit | ||
| } | ||
|
|
||
| func (s *testChunkSizeControlSuite) SetUpSuite(c *C) { | ||
| tableSQLs := map[string]string{} | ||
| tableSQLs["Limit&TableScan"] = "create table t (a int, primary key (a))" | ||
| tableSQLs["Limit&IndexScan"] = "create table t (a int, index idx_a(a))" | ||
|
|
||
| s.m = make(map[string]*testChunkSizeControlKit) | ||
| for name, sql := range tableSQLs { | ||
| // BootstrapSession is not thread-safe, so we have to prepare all resources in SetUp. | ||
| kit := new(testChunkSizeControlKit) | ||
| s.m[name] = kit | ||
| kit.client = &testSlowClient{regionDelay: make(map[uint64]time.Duration)} | ||
| kit.cluster = mocktikv.NewCluster() | ||
| mocktikv.BootstrapWithSingleStore(kit.cluster) | ||
|
|
||
| var err error | ||
| kit.store, err = mockstore.NewMockTikvStore( | ||
| mockstore.WithCluster(kit.cluster), | ||
| mockstore.WithHijackClient(func(c tikv.Client) tikv.Client { | ||
| kit.client.Client = c | ||
| return kit.client | ||
| }), | ||
| ) | ||
| c.Assert(err, IsNil) | ||
|
|
||
| // init domain | ||
| kit.dom, err = session.BootstrapSession(kit.store) | ||
| c.Assert(err, IsNil) | ||
|
|
||
| // create the test table | ||
| kit.tk = testkit.NewTestKitWithInit(c, kit.store) | ||
| kit.tk.MustExec(sql) | ||
| } | ||
| } | ||
|
|
||
| func (s *testChunkSizeControlSuite) getKit(name string) ( | ||
| kv.Storage, *domain.Domain, *testkit.TestKit, *testSlowClient, *mocktikv.Cluster) { | ||
| x := s.m[name] | ||
| return x.store, x.dom, x.tk, x.client, x.cluster | ||
| } | ||
|
|
||
| func (s *testChunkSizeControlSuite) TestLimitAndTableScan(c *C) { | ||
| c.Skip("not stable because coprocessor may result in goroutine leak") | ||
| _, dom, tk, client, cluster := s.getKit("Limit&TableScan") | ||
| defer client.Close() | ||
| tbl, err := dom.InfoSchema().TableByName(model.NewCIStr("test"), model.NewCIStr("t")) | ||
| c.Assert(err, IsNil) | ||
| tid := tbl.Meta().ID | ||
|
|
||
| // construct two regions split by 100 | ||
| splitKeys := generateTableSplitKeyForInt(tid, []int{100}) | ||
| regionIDs := manipulateCluster(cluster, splitKeys) | ||
|
|
||
| noDelayThreshold := time.Millisecond * 100 | ||
| delayDuration := time.Second | ||
| delayThreshold := delayDuration * 9 / 10 | ||
| tk.MustExec("insert into t values (1)") // insert one record into region1, and set a delay duration | ||
| client.SetDelay(regionIDs[0], delayDuration) | ||
|
|
||
| results := tk.MustQuery("explain analyze select * from t where t.a > 0 and t.a < 200 limit 1") | ||
| cost := s.parseTimeCost(c, results.Rows()[0]) | ||
| c.Assert(cost, Not(Less), delayThreshold) // have to wait for region1 | ||
|
|
||
| tk.MustExec("insert into t values (101)") // insert one record into region2 | ||
| results = tk.MustQuery("explain analyze select * from t where t.a > 0 and t.a < 200 limit 1") | ||
| cost = s.parseTimeCost(c, results.Rows()[0]) | ||
| c.Assert(cost, Less, noDelayThreshold) // region2 return quickly | ||
|
|
||
| results = tk.MustQuery("explain analyze select * from t where t.a > 0 and t.a < 200 limit 2") | ||
| cost = s.parseTimeCost(c, results.Rows()[0]) | ||
| c.Assert(cost, Not(Less), delayThreshold) // have to wait | ||
| } | ||
|
|
||
| func (s *testChunkSizeControlSuite) TestLimitAndIndexScan(c *C) { | ||
| c.Skip("not stable because coprocessor may result in goroutine leak") | ||
| _, dom, tk, client, cluster := s.getKit("Limit&IndexScan") | ||
| defer client.Close() | ||
| tbl, err := dom.InfoSchema().TableByName(model.NewCIStr("test"), model.NewCIStr("t")) | ||
| c.Assert(err, IsNil) | ||
| tid := tbl.Meta().ID | ||
| idx := tbl.Meta().Indices[0].ID | ||
|
|
||
| // construct two regions split by 100 | ||
| splitKeys := generateIndexSplitKeyForInt(tid, idx, []int{100}) | ||
| regionIDs := manipulateCluster(cluster, splitKeys) | ||
|
|
||
| noDelayThreshold := time.Millisecond * 100 | ||
| delayDuration := time.Second | ||
| delayThreshold := delayDuration * 9 / 10 | ||
| tk.MustExec("insert into t values (1)") // insert one record into region1, and set a delay duration | ||
| client.SetDelay(regionIDs[0], delayDuration) | ||
|
|
||
| results := tk.MustQuery("explain analyze select * from t where t.a > 0 and t.a < 200 limit 1") | ||
| cost := s.parseTimeCost(c, results.Rows()[0]) | ||
| c.Assert(cost, Not(Less), delayThreshold) // have to wait for region1 | ||
|
|
||
| tk.MustExec("insert into t values (101)") // insert one record into region2 | ||
| results = tk.MustQuery("explain analyze select * from t where t.a > 0 and t.a < 200 limit 1") | ||
| cost = s.parseTimeCost(c, results.Rows()[0]) | ||
| c.Assert(cost, Less, noDelayThreshold) // region2 return quickly | ||
|
|
||
| results = tk.MustQuery("explain analyze select * from t where t.a > 0 and t.a < 200 limit 2") | ||
| cost = s.parseTimeCost(c, results.Rows()[0]) | ||
| c.Assert(cost, Not(Less), delayThreshold) // have to wait | ||
| } | ||
|
|
||
| func (s *testChunkSizeControlSuite) parseTimeCost(c *C, line []interface{}) time.Duration { | ||
| lineStr := fmt.Sprintf("%v", line) | ||
| idx := strings.Index(lineStr, "time:") | ||
| c.Assert(idx, Not(Equals), -1) | ||
| lineStr = lineStr[idx+len("time:"):] | ||
| idx = strings.Index(lineStr, ",") | ||
| c.Assert(idx, Not(Equals), -1) | ||
| timeStr := lineStr[:idx] | ||
| d, err := time.ParseDuration(timeStr) | ||
| c.Assert(err, IsNil) | ||
| return d | ||
| } |
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