lightning: check hasDupe and tableID when resolve duplicate rows

br/pkg/lightning/backend/local/local.go

@@ -69,6 +69,7 @@ import (
 	"go.uber.org/atomic"
 	"go.uber.org/multierr"
 	"go.uber.org/zap"
+	"golang.org/x/exp/slices"
 	"golang.org/x/sync/errgroup"
 	"golang.org/x/time/rate"
 	"google.golang.org/grpc"
@@ -1722,13 +1723,18 @@ func (local *local) ResolveDuplicateRows(ctx context.Context, tbl table.Table, t
 		return err
 	}
 
+	tableIDs := physicalTableIDs(tbl.Meta())
+	keyInTable := func(key []byte) bool {
+		return slices.Contains(tableIDs, tablecodec.DecodeTableID(key))
+	}
+
 	errLimiter := rate.NewLimiter(1, 1)
 	pool := utils.NewWorkerPool(uint(local.dupeConcurrency), "resolve duplicate rows")
 	err = local.errorMgr.ResolveAllConflictKeys(
 		ctx, tableName, pool,
 		func(ctx context.Context, handleRows [][2][]byte) error {
 			for {
-				err := local.deleteDuplicateRows(ctx, logger, handleRows, decoder)
+				err := local.deleteDuplicateRows(ctx, logger, handleRows, decoder, keyInTable)
 				if err == nil {
 					return nil
 				}
@@ -1751,7 +1757,13 @@ func (local *local) ResolveDuplicateRows(ctx context.Context, tbl table.Table, t
 	return errors.Trace(err)
 }
 
-func (local *local) deleteDuplicateRows(ctx context.Context, logger *log.Task, handleRows [][2][]byte, decoder *kv.TableKVDecoder) (err error) {
+func (local *local) deleteDuplicateRows(
+	ctx context.Context,
+	logger *log.Task,
+	handleRows [][2][]byte,
+	decoder *kv.TableKVDecoder,
+	keyInTable func(key []byte) bool,
+) (err error) {
 	// Starts a Delete transaction.
 	txn, err := local.tikvCli.Begin()
 	if err != nil {
@@ -1776,6 +1788,12 @@ func (local *local) deleteDuplicateRows(ctx context.Context, logger *log.Task, h
 	// (if the number of duplicates is small this should fit entirely in memory)
 	// (Txn's MemBuf's bufferSizeLimit is currently infinity)
 	for _, handleRow := range handleRows {
+		// Skip the row key if it's not in the table.
+		// This can happen if the table has been recreated or truncated,
+		// and the duplicate key is from the old table.
+		if !keyInTable(handleRow[0]) {
+			continue
+		}
 		logger.Debug("[resolve-dupe] found row to resolve",
 			logutil.Key("handle", handleRow[0]),
 			logutil.Key("row", handleRow[1]))

br/pkg/lightning/restore/table_restore.go

@@ -812,9 +812,11 @@ func (tr *TableRestore) postProcess(
 			}
 			hasDupe = hasDupe || hasRemoteDupe
 
-			if err = rc.backend.ResolveDuplicateRows(ctx, tr.encTable, tr.tableName, rc.cfg.TikvImporter.DuplicateResolution); err != nil {
-				tr.logger.Error("resolve remote duplicate keys failed", log.ShortError(err))
-				return false, err
+			if hasDupe {
+				if err = rc.backend.ResolveDuplicateRows(ctx, tr.encTable, tr.tableName, rc.cfg.TikvImporter.DuplicateResolution); err != nil {
+					tr.logger.Error("resolve remote duplicate keys failed", log.ShortError(err))
+					return false, err
+				}
 			}
 		}
 

br/tests/lightning_issue_40657/config.toml

@@ -0,0 +1,6 @@
+[tikv-importer]
+backend = "local"
+duplicate-resolution = "remove"
+
+[mydumper.csv]
+header = true

br/tests/lightning_issue_40657/data1/test.t-schema.sql

@@ -0,0 +1,6 @@
+CREATE TABLE `t` (
+     `id` int(11) NOT NULL,
+     `name` varchar(255) DEFAULT NULL,
+     PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
+     UNIQUE KEY `uni_name` (`name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

br/tests/lightning_issue_40657/data1/test.t.0.csv

@@ -0,0 +1,6 @@
+id,name
+1,"aaa01"
+2,"aaa02"
+3,"aaa03"
+4,"aaa04"
+5,"aaa04"

br/tests/lightning_issue_40657/data2/test.t-schema.sql

@@ -0,0 +1,6 @@
+CREATE TABLE `t` (
+     `id` int(11) NOT NULL,
+     `name` varchar(255) DEFAULT NULL,
+     PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
+     UNIQUE KEY `uni_name` (`name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

br/tests/lightning_issue_40657/data2/test.t.0.csv

@@ -0,0 +1,6 @@
+id,name
+1,"aaa01"
+2,"aaa02"
+3,"aaa03"
+4,"aaa04"
+5,"aaa05"

br/tests/lightning_issue_40657/run.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+#
+# Copyright 2020 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,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eux
+
+check_cluster_version 5 2 0 'duplicate detection' || exit 0
+
+run_lightning -d "tests/$TEST_NAME/data1"
+run_sql 'admin check table test.t'
+run_sql 'select count(*) from test.t'
+check_contains 'count(*): 3'
+run_sql 'select count(*) from lightning_task_info.conflict_error_v1'
+check_contains 'count(*): 2'
+
+run_sql 'truncate table test.t'
+run_lightning -d "tests/$TEST_NAME/data2"
+run_sql 'admin check table test.t'
+run_sql 'select count(*) from test.t'
+check_contains 'count(*): 5'