compact restore: use closure to initial snapshot restore checkpoint

br/pkg/restore/snap_client/client.go

@@ -76,6 +76,8 @@ const minBatchDdlSize = 1
 
 type SnapClient struct {
 	restorer restore.SstRestorer
+	// Use a closure to lazy load checkpoint runner
+	getRestorerFn func(*checkpoint.CheckpointRunner[checkpoint.RestoreKeyType, checkpoint.RestoreValueType]) restore.SstRestorer
 	// Tool clients used by SnapClient
 	pdClient     pd.Client
 	pdHTTPClient pdhttp.Client
@@ -148,7 +150,8 @@ type SnapClient struct {
 	rewriteMode RewriteMode
 
 	// checkpoint information for snapshot restore
-	checkpointRunner   *checkpoint.CheckpointRunner[checkpoint.RestoreKeyType, checkpoint.RestoreValueType]
+	checkpointRunner *checkpoint.CheckpointRunner[checkpoint.RestoreKeyType, checkpoint.RestoreValueType]
+
 	checkpointChecksum map[int64]*checkpoint.ChecksumItem
 }
 
@@ -168,7 +171,10 @@ func NewRestoreClient(
 	}
 }
 
-func (rc *SnapClient) GetRestorer() restore.SstRestorer {
+func (rc *SnapClient) GetRestorer(checkpointRunner *checkpoint.CheckpointRunner[checkpoint.RestoreKeyType, checkpoint.RestoreValueType]) restore.SstRestorer {
+	if rc.restorer == nil {
+		rc.restorer = rc.getRestorerFn(checkpointRunner)
+	}
 	return rc.restorer
 }
 
@@ -389,7 +395,10 @@ func (rc *SnapClient) InitCheckpoint(
 		return checkpointSetWithTableID, nil, errors.Trace(err)
 	}
 	rc.checkpointRunner, err = checkpoint.StartCheckpointRunnerForRestore(ctx, se, checkpoint.SnapshotRestoreCheckpointDatabaseName)
-	return checkpointSetWithTableID, checkpointClusterConfig, errors.Trace(err)
+	if err != nil {
+		return checkpointSetWithTableID, nil, errors.Trace(err)
+	}
+	return checkpointSetWithTableID, checkpointClusterConfig, nil
 }
 
 func (rc *SnapClient) WaitForFinishCheckpoint(ctx context.Context, flush bool) {
@@ -539,15 +548,19 @@ func (rc *SnapClient) initClients(ctx context.Context, backend *backuppb.Storage
 			return errors.Trace(err)
 		}
 		// Raw/Txn restore are not support checkpoint for now
-		rc.restorer = restore.NewSimpleSstRestorer(ctx, fileImporter, rc.workerPool, nil)
+		rc.getRestorerFn = func(checkpointRunner *checkpoint.CheckpointRunner[checkpoint.RestoreKeyType, checkpoint.RestoreValueType]) restore.SstRestorer {
+			return restore.NewSimpleSstRestorer(ctx, fileImporter, rc.workerPool, nil)
+		}
 	} else {
 		// or create a fileImporter with the cluster API version
 		fileImporter, err = NewSnapFileImporter(
 			ctx, rc.dom.Store().GetCodec().GetAPIVersion(), TiDBFull, opt)
 		if err != nil {
 			return errors.Trace(err)
 		}
-		rc.restorer = restore.NewMultiTablesRestorer(ctx, fileImporter, rc.workerPool, rc.checkpointRunner)
+		rc.getRestorerFn = func(checkpointRunner *checkpoint.CheckpointRunner[checkpoint.RestoreKeyType, checkpoint.RestoreValueType]) restore.SstRestorer {
+			return restore.NewMultiTablesRestorer(ctx, fileImporter, rc.workerPool, checkpointRunner)
+		}
 	}
 	return nil
 }

br/pkg/restore/snap_client/tikv_sender.go

@@ -385,9 +385,10 @@ func (rc *SnapClient) RestoreSSTFiles(
 		}
 	})
 
-	retErr = rc.restorer.GoRestore(onProgress, tableIDWithFilesGroup...)
+	r := rc.GetRestorer(rc.checkpointRunner)
+	retErr = r.GoRestore(onProgress, tableIDWithFilesGroup...)
 	if retErr != nil {
 		return retErr
 	}
-	return rc.restorer.WaitUntilFinish()
+	return r.WaitUntilFinish()
 }

br/pkg/task/restore_raw.go

@@ -163,11 +163,11 @@ func RunRestoreRaw(c context.Context, g glue.Glue, cmdName string, cfg *RestoreR
 	defer restore.RestorePostWork(ctx, importModeSwitcher, restoreSchedulers, cfg.Online)
 
 	start := time.Now()
-	err = client.GetRestorer().GoRestore(onProgress, restore.CreateUniqueFileSets(files))
+	err = client.GetRestorer(nil).GoRestore(onProgress, restore.CreateUniqueFileSets(files))
 	if err != nil {
 		return errors.Trace(err)
 	}
-	err = client.GetRestorer().WaitUntilFinish()
+	err = client.GetRestorer(nil).WaitUntilFinish()
 	if err != nil {
 		return errors.Trace(err)
 	}

br/pkg/task/restore_txn.go

@@ -102,11 +102,11 @@ func RunRestoreTxn(c context.Context, g glue.Glue, cmdName string, cfg *Config)
 	}
 	defer restore.RestorePostWork(ctx, importModeSwitcher, restoreSchedulers, false)
 
-	err = client.GetRestorer().GoRestore(onProgress, restore.CreateUniqueFileSets(files))
+	err = client.GetRestorer(nil).GoRestore(onProgress, restore.CreateUniqueFileSets(files))
 	if err != nil {
 		return errors.Trace(err)
 	}
-	err = client.GetRestorer().WaitUntilFinish()
+	err = client.GetRestorer(nil).WaitUntilFinish()
 	if err != nil {
 		return errors.Trace(err)
 	}

br/tests/br_restore_checkpoint/run.sh

@@ -69,16 +69,20 @@ if [ $restore_fail -ne 1 ]; then
 fi
 
 # PITR with checkpoint but failed in the log restore metakv stage
-export GO_FAILPOINTS="github.com/pingcap/tidb/br/pkg/restore/snap_client/corrupt-files=return(\"only-last-table-files\");\
-github.com/pingcap/tidb/br/pkg/restore/log_client/failed-after-id-maps-saved=return(true)"
+export GO_FAILPOINTS="github.com/pingcap/tidb/br/pkg/restore/snap_client/corrupt-files=return(\"only-last-table-files\")"
+export GO_FAILPOINTS=$GO_FAILPOINTS";github.com/pingcap/tidb/br/pkg/restore/log_client/failed-after-id-maps-saved=return(true)"
 restore_fail=0
 run_br --pd $PD_ADDR restore point --full-backup-storage "local://$TEST_DIR/$PREFIX/full" -s "local://$TEST_DIR/$PREFIX/log" || restore_fail=1
 export GO_FAILPOINTS=""
 if [ $restore_fail -ne 1 ]; then
-    echo 'PITR success'
+    echo 'PITR success, but should fail'
     exit 1
 fi
 
+# check the snapshot restore has checkpoint data
+run_sql 'select count(*) from '"__TiDB_BR_Temporary_Snapshot_Restore_Checkpoint"'.`cpt_data`;'
+check_contains "count(*): 1"
+
 # PITR with checkpoint but failed in the log restore datakv stage
 # skip the snapshot restore stage
 export GO_FAILPOINTS="github.com/pingcap/tidb/br/pkg/task/corrupt-files=return(\"corrupt-last-table-files\")"