查看了tidb.log，发现了这个
[2022/12/05 14:47:17.787 +08:00] [INFO] [conn.go:1149] [“command dispatched failed”] [conn=367744858060751563] [connInfo=“id:367744858060751563, addr:172.28.3.8:61211 status:11, collation:utf8_general_ci, user:tx_data”] [command=Execute] [status=“inTxn:1, autocommit:1”] [sql=“DELETE FROM stat_day_longteng WHERE event_date = ? [arguments: "20210212"]”] [txn_mode=PESSIMISTIC] [timestamp=437838892945375274] [err=“context canceled\ngithub.com/tikv/client-go/v2/internal/locate.(*RegionRequestSender).sendReqToRegion\n\t/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.1-0.20220531092439-efebaeb9fe53/internal/locate/region_request.go:1220\ngithub.com/tikv/client-go/v2/internal/locate.(*RegionRequestSender).SendReqCtx\n\t/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.1-0.20220531092439-efebaeb9fe53/internal/locate/region_request.go:990\ngithub.com/tikv/client-go/v2/internal/locate.(*RegionRequestSender).SendReq\n\t/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.1-0.20220531092439-efebaeb9fe53/internal/locate/region_request.go:231\ngithub.com/tikv/client-go/v2/tikv.(*KVStore).SendReq\n\t/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.1-0.20220531092439-efebaeb9fe53/tikv/kv.go:394\ngithub.com/tikv/client-go/v2/txnkv/transaction.actionPessimisticLock.handleSingleBatch\n\t/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.1-0.20220531092439-efebaeb9fe53/txnkv/transaction/pessimistic.go:143\ngithub.com/tikv/client-go/v2/txnkv/transaction.(*batchExecutor).startWorker.func1\n\t/go/pkg/mod/github.com/tikv/client-go/v2@v2.0.1-0.20220531092439-efebaeb9fe53/txnkv/transaction/2pc.go:1993\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1571\ngithub.com/pingcap/errors.AddStack\n\t/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20211224045212-9687c2b0f87c/errors.go:174\ngithub.com/pingcap/errors.Trace\n\t/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20211224045212-9687c2b0f87c/juju_adaptor.go:15\ngithub.com/pingcap/tidb/store/driver/error.ToTiDBErr\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/store/driver/error/error.go:169\ngithub.com/pingcap/tidb/store/driver/txn.extractKeyErr\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/store/driver/txn/error.go:154\ngithub.com/pingcap/tidb/store/driver/txn.(*tikvTxn).extractKeyErr\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/store/driver/txn/txn_driver.go:275\ngithub.com/pingcap/tidb/store/driver/txn.(*tikvTxn).LockKeys\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/store/driver/txn/txn_driver.go:75\ngithub.com/pingcap/tidb/session.(*LazyTxn).LockKeys\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/session/txn.go:392\ngithub.com/pingcap/tidb/executor.(*ExecStmt).handlePessimisticDML\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/executor/adapter.go:714\ngithub.com/pingcap/tidb/executor.(*ExecStmt).handleNoDelay\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/executor/adapter.go:514\ngithub.com/pingcap/tidb/executor.(*ExecStmt).Exec\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/executor/adapter.go:465\ngithub.com/pingcap/tidb/session.runStmt\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/session/session.go:2069\ngithub.com/pingcap/tidb/session.(*session).preparedStmtExec\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/session/session.go:2223\ngithub.com/pingcap/tidb/session.(*session).ExecutePreparedStmt\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/session/session.go:2419\ngithub.com/pingcap/tidb/server.(*TiDBStatement).Execute\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/server/driver_tidb.go:75\ngithub.com/pingcap/tidb/server.(*clientConn).executePreparedStmtAndWriteResult\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/server/conn_stmt.go:234\ngithub.com/pingcap/tidb/server.(*clientConn).handleStmtExecute\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/server/conn_stmt.go:201\ngithub.com/pingcap/tidb/server.(*clientConn).dispatch\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/server/conn.go:1393\ngithub.com/pingcap/tidb/server.(*clientConn).Run\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/server/conn.go:1121\ngithub.com/pingcap/tidb/server.(*Server).onConn\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/server/server.go:559\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1571\nDELETE FROM stat_day_longteng WHERE event_date = ? [arguments: "20210212"]”]