lightning: make pre-check output message clearer (#30439)

br/pkg/lightning/common/storage_unix.go

@@ -23,13 +23,18 @@ import (
 	"syscall"
 
 	"github.com/pingcap/errors"
+	"github.com/pingcap/failpoint"
 	"golang.org/x/sys/unix"
 )
 
 // GetStorageSize gets storage's capacity and available size
 func GetStorageSize(dir string) (size StorageSize, err error) {
-	var stat unix.Statfs_t
+	failpoint.Inject("GetStorageSize", func(val failpoint.Value) {
+		injectedSize := val.(int)
+		failpoint.Return(StorageSize{Capacity: uint64(injectedSize), Available: uint64(injectedSize)}, nil)
+	})
 
+	var stat unix.Statfs_t
 	err = unix.Statfs(dir, &stat)
 	if err != nil {
 		return size, errors.Annotatef(err, "cannot get disk capacity at %s", dir)

br/pkg/lightning/common/storage_windows.go

@@ -23,6 +23,7 @@ import (
 	"unsafe"
 
 	"github.com/pingcap/errors"
+	"github.com/pingcap/failpoint"
 )
 
 var (
@@ -32,6 +33,10 @@ var (
 
 // GetStorageSize gets storage's capacity and available size
 func GetStorageSize(dir string) (size StorageSize, err error) {
+	failpoint.Inject("GetStorageSize", func(val failpoint.Value) {
+		injectedSize := val.(int)
+		failpoint.Return(StorageSize{Capacity: uint64(injectedSize), Available: uint64(injectedSize)}, nil)
+	})
 	r, _, e := getDiskFreeSpaceExW.Call(
 		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(dir))),
 		uintptr(unsafe.Pointer(&size.Available)),

br/pkg/lightning/restore/check_info.go

@@ -454,33 +454,31 @@ func (rc *Controller) localResource(sourceSize int64) error {
 	if err != nil {
 		return errors.Trace(err)
 	}
-	localAvailable := storageSize.Available
+	localAvailable := int64(storageSize.Available)
 
 	var message string
 	var passed bool
 	switch {
-	case localAvailable > uint64(sourceSize):
+	case localAvailable > sourceSize:
 		message = fmt.Sprintf("local disk resources are rich, estimate sorted data size %s, local available is %s",
 			units.BytesSize(float64(sourceSize)), units.BytesSize(float64(localAvailable)))
 		passed = true
+	case int64(rc.cfg.TikvImporter.DiskQuota) > localAvailable:
+		message = fmt.Sprintf("local disk space may not enough to finish import, estimate sorted data size is %s,"+
+			" but local available is %s, please set `tikv-importer.disk-quota` to a smaller value than %s"+
+			" or change `mydumper.sorted-kv-dir` to another disk with enough space to finish imports",
+			units.BytesSize(float64(sourceSize)),
+			units.BytesSize(float64(localAvailable)), units.BytesSize(float64(localAvailable)))
+		passed = false
+		log.L().Error(message)
 	default:
-		if int64(rc.cfg.TikvImporter.DiskQuota) > int64(localAvailable) {
-			message = fmt.Sprintf("local disk space may not enough to finish import"+
-				"estimate sorted data size is %s, but local available is %s,"+
-				"you need a smaller number for tikv-importer.disk-quota (%s) to finish imports",
-				units.BytesSize(float64(sourceSize)),
-				units.BytesSize(float64(localAvailable)), units.BytesSize(float64(rc.cfg.TikvImporter.DiskQuota)))
-			passed = false
-			log.L().Error(message)
-		} else {
-			message = fmt.Sprintf("local disk space may not enough to finish import, "+
-				"estimate sorted data size is %s, but local available is %s,"+
-				"we will use disk-quota (size: %s) to finish imports, which may slow down import",
-				units.BytesSize(float64(sourceSize)),
-				units.BytesSize(float64(localAvailable)), units.BytesSize(float64(rc.cfg.TikvImporter.DiskQuota)))
-			passed = true
-			log.L().Warn(message)
-		}
+		message = fmt.Sprintf("local disk space may not enough to finish import, "+
+			"estimate sorted data size is %s, but local available is %s,"+
+			"we will use disk-quota (size: %s) to finish imports, which may slow down import",
+			units.BytesSize(float64(sourceSize)),
+			units.BytesSize(float64(localAvailable)), units.BytesSize(float64(rc.cfg.TikvImporter.DiskQuota)))
+		passed = true
+		log.L().Warn(message)
 	}
 	rc.checkTemplate.Collect(Critical, passed, message)
 	return nil

br/pkg/lightning/restore/check_info_test.go

@@ -0,0 +1,79 @@
+// Copyright 2021 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.
+
+package restore
+
+import (
+	"context"
+	. "github.com/pingcap/check"
+	"github.com/pingcap/failpoint"
+
+	"github.com/pingcap/tidb/br/pkg/lightning/config"
+	"github.com/pingcap/tidb/br/pkg/lightning/worker"
+	"github.com/pingcap/tidb/br/pkg/storage"
+)
+
+var _ = Suite(&checkInfoSuite{})
+
+type checkInfoSuite struct{}
+
+func (s *checkInfoSuite) TestLocalResource(c *C) {
+	dir := c.MkDir()
+	mockStore, err := storage.NewLocalStorage(dir)
+	c.Assert(err, IsNil)
+
+	err = failpoint.Enable("github.com/pingcap/tidb/br/pkg/lightning/common/GetStorageSize", "return(2048)")
+	c.Assert(err, IsNil)
+	defer func() {
+		_ = failpoint.Disable("github.com/pingcap/tidb/br/pkg/lightning/common/GetStorageSize")
+	}()
+
+	cfg := config.NewConfig()
+	cfg.Mydumper.SourceDir = dir
+	cfg.TikvImporter.SortedKVDir = dir
+	cfg.TikvImporter.Backend = "local"
+	rc := &Controller{
+		cfg:       cfg,
+		store:     mockStore,
+		ioWorkers: worker.NewPool(context.Background(), 1, "io"),
+	}
+
+	// 1. source-size is smaller than disk-size, won't trigger error information
+	rc.checkTemplate = NewSimpleTemplate()
+	err = rc.localResource(1000)
+	c.Assert(err, IsNil)
+	tmpl := rc.checkTemplate.(*SimpleTemplate)
+	c.Assert(tmpl.warnFailedCount, Equals, 1)
+	c.Assert(tmpl.criticalFailedCount, Equals, 0)
+	c.Assert(tmpl.normalMsgs[1], Matches, "local disk resources are rich, estimate sorted data size 1000B, local available is 2KiB")
+
+	// 2. source-size is bigger than disk-size, with default disk-quota will trigger a critical error
+	rc.checkTemplate = NewSimpleTemplate()
+	err = rc.localResource(4096)
+	c.Assert(err, IsNil)
+	tmpl = rc.checkTemplate.(*SimpleTemplate)
+	c.Assert(tmpl.warnFailedCount, Equals, 1)
+	c.Assert(tmpl.criticalFailedCount, Equals, 1)
+	c.Assert(tmpl.criticalMsgs[0], Matches, "local disk space may not enough to finish import, estimate sorted data size is 4KiB, but local available is 2KiB, please set `tikv-importer.disk-quota` to a smaller value than 2KiB or change `mydumper.sorted-kv-dir` to another disk with enough space to finish imports")
+
+	// 3. source-size is bigger than disk-size, with a vaild disk-quota will trigger a warning
+	rc.checkTemplate = NewSimpleTemplate()
+	rc.cfg.TikvImporter.DiskQuota = config.ByteSize(1024)
+	err = rc.localResource(4096)
+	c.Assert(err, IsNil)
+	tmpl = rc.checkTemplate.(*SimpleTemplate)
+	c.Assert(tmpl.warnFailedCount, Equals, 1)
+	c.Assert(tmpl.criticalFailedCount, Equals, 0)
+	c.Assert(tmpl.normalMsgs[1], Matches, "local disk space may not enough to finish import, estimate sorted data size is 4KiB, but local available is 2KiB,we will use disk-quota \\(size: 1KiB\\) to finish imports, which may slow down import")
+}

br/pkg/lightning/restore/check_template.go

@@ -51,7 +51,8 @@ type SimpleTemplate struct {
 	count               int
 	warnFailedCount     int
 	criticalFailedCount int
-	failedMsg           []string
+	normalMsgs          []string // only used in unit test now
+	criticalMsgs        []string
 	t                   table.Writer
 }
 
@@ -65,16 +66,12 @@ func NewSimpleTemplate() Template {
 		{Name: "Passed", WidthMax: 6},
 	})
 	return &SimpleTemplate{
-		0,
-		0,
-		0,
-		make([]string, 0),
-		t,
+		t: t,
 	}
 }
 
 func (c *SimpleTemplate) FailedMsg() string {
-	return strings.Join(c.failedMsg, ";\n")
+	return strings.Join(c.criticalMsgs, ";\n")
 }
 
 func (c *SimpleTemplate) Collect(t CheckType, passed bool, msg string) {
@@ -87,7 +84,11 @@ func (c *SimpleTemplate) Collect(t CheckType, passed bool, msg string) {
 			c.warnFailedCount++
 		}
 	}
-	c.failedMsg = append(c.failedMsg, msg)
+	if !passed && t == Critical {
+		c.criticalMsgs = append(c.criticalMsgs, msg)
+	} else {
+		c.normalMsgs = append(c.normalMsgs, msg)
+	}
 	c.t.AppendRow(table.Row{c.count, msg, t, passed})
 	c.t.AppendSeparator()
 }
@@ -108,7 +109,7 @@ func (c *SimpleTemplate) FailedCount(t CheckType) int {
 
 func (c *SimpleTemplate) Output() string {
 	c.t.SetAllowedRowLength(170)
-	c.t.SetRowPainter(table.RowPainter(func(row table.Row) text.Colors {
+	c.t.SetRowPainter(func(row table.Row) text.Colors {
 		if passed, ok := row[3].(bool); ok {
 			if !passed {
 				if typ, ok := row[2].(CheckType); ok {
@@ -122,7 +123,7 @@ func (c *SimpleTemplate) Output() string {
 			}
 		}
 		return nil
-	}))
+	})
 	res := c.t.Render()
 	summary := "\n"
 	if c.criticalFailedCount > 0 {

br/pkg/lightning/restore/restore.go

@@ -1926,8 +1926,7 @@ func (rc *Controller) preCheckRequirements(ctx context.Context) error {
 		if !taskExist && rc.taskMgr != nil {
 			rc.taskMgr.CleanupTask(ctx)
 		}
-		return errors.Errorf("tidb-lightning check failed."+
-			" Please fix the failed check(s):\n %s", rc.checkTemplate.FailedMsg())
+		return errors.Errorf("tidb-lightning pre-check failed: %s", rc.checkTemplate.FailedMsg())
 	}
 	return nil
 }