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cd $GOPATH/src/github.com/pingcap git clone https://github.com/pingcap/tidb gmake #编译源码
https://pingcap.com/blog-cn/tidb-source-code-reading-2/#kv-api-layer
通过这一篇文章我们可以找到
tidb/kv/kv.go这个文件，它定义的Transaction接口描述了 TiDB 对于事务的基本操作// Transaction defines the interface for operations inside a Transaction. // This is not thread safe. type Transaction interface { ... // Commit commits the transaction operations to KV store. Commit(context.Context) error ... }
然后顺藤摸瓜，我们找到了其同文件夹下的
kv/txn.go，通过名字我们大致推测出他跟事务操作有关。// RunInNewTxn will run the f in a new transaction environment. func RunInNewTxn(store Storage, retryable bool, f func(txn Transaction) error) error { var ( err error originalTxnTS uint64 txn Transaction ) // hello transaction logutil.BgLogger().Info("[test] hello transaction") for i := uint(0); i < maxRetryCnt; i++ { txn, err = store.Begin() if err != nil { logutil.BgLogger().Error("RunInNewTxn", zap.Error(err)) return err }
然后找到了
RunInNewTxn这个函数 ，在函数开始执行的时候加入日志打印结果首先我们使用
make直接在代码目录下进行编译smilencer@smilencer-OptiPlex-7040 ~/Code/golang/src/github.com/pingcap/tidb (weak1) $ make CGO_ENABLED=1 GO111MODULE=on go build -tags codes -ldflags '-X "github.com/pingcap/parser/mysql.TiDBReleaseVersion=v4.0.0-beta.2-962-g738f677ee" -X "github.com/pingcap/tidb/util/versioninfo.TiDBBuildTS=2020-08-16 10:42:11" -X "github.com/pingcap/tidb/util/versioninfo.TiDBGitHash=738f677eee4c82e45aee3899b1be7b653bfaa759" -X "github.com/pingcap/tidb/util/versioninfo.TiDBGitBranch=weak1" -X "github.com/pingcap/tidb/util/versioninfo.TiDBEdition=Community" ' -o bin/tidb-server tidb-server/main.go Build TiDB Server successfully!
然后我们使用 TiUP 进行临时二进制包部署，根据课程要求设为
--db 1 --pd 1 --kv 3smilencer@smilencer-OptiPlex-7040 ~ $ tiup playground --db.binpath /home/smilencer/Code/golang/src/github.com/pingcap/tidb/bin/tidb-server --db 1 --pd 1 --kv 3 --monitor Starting component `playground`: /home/smilencer/.tiup/components/playground/v1.0.9/tiup-playground --db.binpath /home/smilencer/Code/golang/src/github.com/pingcap/tidb/bin/tidb-server --db 1 --pd 1 --kv 3 --monitor Use the latest stable version: v4.0.4 Specify version manually: tiup playground <version> The stable version: tiup playground v4.0.0 The nightly version: tiup playground nightly Playground Bootstrapping... Start pd instance... Start tikv instance... Start tikv instance... Start tikv instance... Start tidb instance... ............................................................To view the dashboard: http://127.0.0.1:37207/dashboard To view the Prometheus: http://127.0.0.1:39749 To view the Grafana: http://127.0.0.1:3000
新开启一个 session 以访问 TiDB 数据库
mysql --host 127.0.0.1 --port 4000 -u root
尝试使用开启事务的语句
... begin; insert into test values (1); insert into test values (2); insert into test values (3); commit;
在 http://127.0.0.1:37207/dashboard 中寻找日志
[2020/08/16 20:31:12.600 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:13.600 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:13.600 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:14.424 +08:00] [Info] [session.go:2257] ["CRUCIAL OPERATION"] [conn=15] [schemaVersion=23] [cur_db=mysql] [sql="CREATE TABLE test(\nid INT(11)\n)"] [user=root@127.0.0.1] [2020/08/16 20:31:14.425 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:14.492 +08:00] [Warn] [2pc.go:1006] ["schemaLeaseChecker is not set for this transaction, schema check skipped"] [connID=0] [startTS=418796293169086467] [commitTS=418796293182193665] [2020/08/16 20:31:14.556 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:14.600 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:14.600 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:14.701 +08:00] [Warn] [2pc.go:1006] ["schemaLeaseChecker is not set for this transaction, schema check skipped"] [connID=0] [startTS=418796293208408065] [commitTS=418796293234622466] [2020/08/16 20:31:14.852 +08:00] [Info] [ddl_worker.go:260] ["[ddl] add DDL jobs"] ["batch count"=1] [jobs="ID:48, Type:create table, State:none, SchemaState:none, SchemaID:3, TableID:47, RowCount:0, ArgLen:1, start time: 2020-08-16 20:31:14.556 +0800 CST, Err:<nil>, ErrCount:0, SnapshotVersion:0; "] [2020/08/16 20:31:14.852 +08:00] [Info] [ddl.go:475] ["[ddl] start DDL job"] [job="ID:48, Type:create table, State:none, SchemaState:none, SchemaID:3, TableID:47, RowCount:0, ArgLen:1, start time: 2020-08-16 20:31:14.556 +0800 CST, Err:<nil>, ErrCount:0, SnapshotVersion:0"] [query="CREATE TABLE test(\nid INT(11)\n)"] [2020/08/16 20:31:14.852 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:14.853 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:14.853 +08:00] [Info] [ddl_worker.go:589] ["[ddl] run DDL job"] [worker="worker 3, tp general"] [job="ID:48, Type:create table, State:none, SchemaState:none, SchemaID:3, TableID:47, RowCount:0, ArgLen:0, start time: 2020-08-16 20:31:14.556 +0800 CST, Err:<nil>, ErrCount:0, SnapshotVersion:0"] [2020/08/16 20:31:14.854 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:15.352 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:15.600 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:15.620 +08:00] [Warn] [2pc.go:1006] ["schemaLeaseChecker is not set for this transaction, schema check skipped"] [connID=0] [startTS=418796293273944066] [commitTS=418796293483659265] [2020/08/16 20:31:15.645 +08:00] [Info] [prewrite.go:166] ["prewrite encounters lock"] [conn=0] [lock="key: []byte{0x6d, 0x44, 0x42, 0x3a, 0x33, 0x0, 0x0, 0x0, 0x0, 0xfb, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x48}, primary: []byte{0x6d, 0x44, 0x42, 0x3a, 0x33, 0x0, 0x0, 0x0, 0x0, 0xfb, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x48}, txnStartTS: 418796293273944066, lockForUpdateTS:0, ttl: 3001, type: Put"] [2020/08/16 20:31:15.697 +08:00] [Warn] [txn.go:67] [RunInNewTxn] ["retry txn"=418796293273944068] ["original txn"=418796293273944068] [error="[kv:9007]Write conflict, txnStartTS=418796293273944068, conflictStartTS=418796293273944066, conflictCommitTS=418796293483659265, key=[]byte{0x6d, 0x44, 0x42, 0x3a, 0x33, 0x0, 0x0, 0x0, 0x0, 0xfb, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x48} primary=[]byte{0x6d, 0x44, 0x42, 0x3a, 0x33, 0x0, 0x0, 0x0, 0x0, 0xfb, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x48} [try again later]"] [2020/08/16 20:31:15.754 +08:00] [Info] [domain.go:127] ["diff load InfoSchema success"] [usedSchemaVersion=23] [neededSchemaVersion=24] ["start time"=56.598995ms] [phyTblIDs="[47]"] [actionTypes="[8]"] [2020/08/16 20:31:15.852 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:15.863 +08:00] [Info] [2pc.go:717] ["2PC clean up done"] [txnStartTS=418796293273944068] [2020/08/16 20:31:15.863 +08:00] [Info] [syncer.go:399] ["[ddl] syncer check all versions, someone is not synced, continue checking"] [ddl=/tidb/ddl/all_schema_versions/8a240190-cef1-4fc2-a5d0-a068e3081dbe] [currentVer=23] [latestVer=24] [2020/08/16 20:31:15.884 +08:00] [Info] [ddl_worker.go:783] ["[ddl] wait latest schema version changed"] [worker="worker 3, tp general"] [ver=24] ["take time"=188.518564ms] [job="ID:48, Type:create table, State:done, SchemaState:public, SchemaID:3, TableID:47, RowCount:0, ArgLen:1, start time: 2020-08-16 20:31:14.556 +0800 CST, Err:<nil>, ErrCount:0, SnapshotVersion:0"] [2020/08/16 20:31:15.884 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:15.887 +08:00] [Info] [ddl_worker.go:366] ["[ddl] finish DDL job"] [worker="worker 3, tp general"] [job="ID:48, Type:create table, State:synced, SchemaState:public, SchemaID:3, TableID:47, RowCount:0, ArgLen:0, start time: 2020-08-16 20:31:14.556 +0800 CST, Err:<nil>, ErrCount:0, SnapshotVersion:0"] [2020/08/16 20:31:16.014 +08:00] [Warn] [2pc.go:1006] ["schemaLeaseChecker is not set for this transaction, schema check skipped"] [connID=0] [startTS=418796293549195265] [commitTS=418796293588516865] [2020/08/16 20:31:16.014 +08:00] [Warn] [2pc.go:1006] ["schemaLeaseChecker is not set for this transaction, schema check skipped"] [connID=0] [startTS=418796293496766467] [commitTS=418796293588516866] [2020/08/16 20:31:16.186 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:16.187 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:16.187 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:16.188 +08:00] [Info] [ddl.go:507] ["[ddl] DDL job is finished"] [jobID=48] [2020/08/16 20:31:16.299 +08:00] [Info] [domain.go:643] ["performing DDL change, must reload"] [2020/08/16 20:31:16.300 +08:00] [Info] [split_region.go:59] ["split batch regions request"] ["split key count"=1] ["batch count"=1] ["first batch, region ID"=4] ["first split key"=74800000000000002f] [2020/08/16 20:31:16.599 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:16.599 +08:00] [Info] [txn.go:35] ["[test] hello transaction"] [2020/08/16 20:31:16.631 +08:00] [Info] [split_region.go:156] ["batch split regions complete"] ["batch region ID"=4] ["first at"=74800000000000002f] ["first new region left"="{Id:103 StartKey:7480000000000000ff2d00000000000000f8 EndKey:7480000000000000ff2f00000000000000f8 RegionEpoch:{ConfVer:5 Version:23} Peers:[id:104 store_id:1 id:105 store_id:2 id:106 store_id:3 ]}"] ["new region count"=1] [2020/08/16 20:31:16.631 +08:00] [Info] [split_region.go:205] ["split regions complete"] ["region count"=1] ["region IDs"="[103]"]发现出现了很多
hello transaction