Merge branch 'github:master' into add-rocksdb-as-transactional-engine

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ on: [pull_request]
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/replica-tests.yml

@@ -5,7 +5,7 @@ on: [pull_request]
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         version: [mysql-5.7.25,mysql-8.0.16]

.golangci.yml

@@ -4,14 +4,19 @@ linters:
   disable:
     - errcheck
   enable:
+    - bodyclose
+    - containedctx
     - contextcheck
+    - dogsled
     - durationcheck
     - errname
+    - errorlint
     - execinquery
     - gofmt
     - ifshort
     - misspell
     - nilerr
+    - nilnil
     - noctx
     - nolintlint
     - nosprintfhostport
@@ -19,6 +24,7 @@ linters:
     - rowserrcheck
     - sqlclosecheck
     - unconvert
+    - unparam
     - unused
     - wastedassign
     - whitespace

doc/command-line-flags.md

@@ -45,6 +45,22 @@ If you happen to _know_ your servers use RBR (Row Based Replication, i.e. `binlo
 Skipping this step means `gh-ost` would not need the `SUPER` privilege in order to operate.
 You may want to use this on Amazon RDS.
 
+### attempt-instant-ddl
+
+MySQL 8.0 supports "instant DDL" for some operations. If an alter statement can be completed with instant DDL, only a metadata change is required internally. Instant operations include:
+
+- Adding a column
+- Dropping a column
+- Dropping an index
+- Extending a varchar column
+- Adding a virtual generated column
+
+It is not reliable to parse the `ALTER` statement to determine if it is instant or not. This is because the table might be in an older row format, or have some other incompatibility that is difficult to identify.
+
+`--attempt-instant-ddl` is disabled by default, but the risks of enabling it are relatively minor: `gh-ost` may need to acquire a metadata lock at the start of the operation. This is not a problem for most scenarios, but it could be a problem for users that start the DDL during a period with long running transactions.
+
+`gh-ost` will automatically fallback to the normal DDL process if the attempt to use instant DDL is unsuccessful.
+
 ### conf
 
 `--conf=/path/to/my.cnf`: file where credentials are specified. Should be in (or contain) the following format:

doc/shared-key.md

@@ -29,7 +29,7 @@ CREATE TABLE tbl (
 
 (This is also the definition of the _ghost_ table, except that that table would be called `_tbl_gho`). 
 
-In this migration, the _before_ and _after_ versions contain the same unique not-null key (the PRIMARY KEY). To run this migration, `gh-ost` would iterate through the `tbl` table using the primary key, copy rows from `tbl` to the _ghost_ table `_tbl_gho` in primary key order, while also applying the binlog event writes from `tble` onto `_tbl_gho`.
+In this migration, the _before_ and _after_ versions contain the same unique not-null key (the PRIMARY KEY). To run this migration, `gh-ost` would iterate through the `tbl` table using the primary key, copy rows from `tbl` to the _ghost_ table `_tbl_gho` in primary key order, while also applying the binlog event writes from `tbl` onto `_tbl_gho`.
 
 The applying of the binlog events is what requires the shared unique key. For example, an `UPDATE` statement to `tbl` translates to a `REPLACE` statement which `gh-ost` applies to `_tbl_gho`. A `REPLACE` statement expects to insert or replace an existing row based on its row's values and the table's unique key constraints. In particular, if inserting that row would result in a unique key violation (e.g., a row with that primary key already exists), it would _replace_ that existing row with the new values.
 

go/base/context.go

@@ -101,6 +101,7 @@ type MigrationContext struct {
 	AliyunRDS                bool
 	GoogleCloudPlatform      bool
 	AzureMySQL               bool
+	AttemptInstantDDL        bool
 
 	config            ContextConfig
 	configMutex       *sync.Mutex
@@ -862,7 +863,7 @@ func (this *MigrationContext) ReadConfigFile() error {
 	if cfg.Section("osc").HasKey("chunk_size") {
 		this.config.Osc.Chunk_Size, err = cfg.Section("osc").Key("chunk_size").Int64()
 		if err != nil {
-			return fmt.Errorf("Unable to read osc chunk size: %s", err.Error())
+			return fmt.Errorf("Unable to read osc chunk size: %w", err)
 		}
 	}
 
@@ -877,7 +878,7 @@ func (this *MigrationContext) ReadConfigFile() error {
 	if cfg.Section("osc").HasKey("max_lag_millis") {
 		this.config.Osc.Max_Lag_Millis, err = cfg.Section("osc").Key("max_lag_millis").Int64()
 		if err != nil {
-			return fmt.Errorf("Unable to read max lag millis: %s", err.Error())
+			return fmt.Errorf("Unable to read max lag millis: %w", err)
 		}
 	}
 

go/cmd/gh-ost/main.go

@@ -67,6 +67,8 @@ func main() {
 	flag.StringVar(&migrationContext.DatabaseName, "database", "", "database name (mandatory)")
 	flag.StringVar(&migrationContext.OriginalTableName, "table", "", "table name (mandatory)")
 	flag.StringVar(&migrationContext.AlterStatement, "alter", "", "alter statement (mandatory)")
+	flag.BoolVar(&migrationContext.AttemptInstantDDL, "attempt-instant-ddl", false, "Attempt to use instant DDL for this migration first")
+
 	flag.BoolVar(&migrationContext.CountTableRows, "exact-rowcount", false, "actually count table rows as opposed to estimate them (results in more accurate progress estimation)")
 	flag.BoolVar(&migrationContext.ConcurrentCountTableRows, "concurrent-rowcount", true, "(with --exact-rowcount), when true (default): count rows after row-copy begins, concurrently, and adjust row estimate later on; when false: first count rows, then start row copy")
 	flag.BoolVar(&migrationContext.AllowedRunningOnMaster, "allow-on-master", false, "allow this migration to run directly on master. Preferably it would run on a replica")

go/logic/applier.go

@@ -135,6 +135,16 @@ func (this *Applier) generateSqlModeQuery() string {
 	return fmt.Sprintf("sql_mode = %s", sqlModeQuery)
 }
 
+// generateInstantDDLQuery returns the SQL for this ALTER operation
+// with an INSTANT assertion (requires MySQL 8.0+)
+func (this *Applier) generateInstantDDLQuery() string {
+	return fmt.Sprintf(`ALTER /* gh-ost */ TABLE %s.%s %s, ALGORITHM=INSTANT`,
+		sql.EscapeName(this.migrationContext.DatabaseName),
+		sql.EscapeName(this.migrationContext.OriginalTableName),
+		this.migrationContext.AlterStatementOptions,
+	)
+}
+
 // readTableColumns reads table columns on applier
 func (this *Applier) readTableColumns() (err error) {
 	this.migrationContext.Log.Infof("Examining table structure on applier")
@@ -188,6 +198,27 @@ func (this *Applier) ValidateOrDropExistingTables() error {
 	return nil
 }
 
+// AttemptInstantDDL attempts to use instant DDL (from MySQL 8.0, and earlier in Aurora and some others).
+// If successful, the operation is only a meta-data change so a lot of time is saved!
+// The risk of attempting to instant DDL when not supported is that a metadata lock may be acquired.
+// This is minor, since gh-ost will eventually require a metadata lock anyway, but at the cut-over stage.
+// Instant operations include:
+// - Adding a column
+// - Dropping a column
+// - Dropping an index
+// - Extending a VARCHAR column
+// - Adding a virtual generated column
+// It is not reliable to parse the `alter` statement to determine if it is instant or not.
+// This is because the table might be in an older row format, or have some other incompatibility
+// that is difficult to identify.
+func (this *Applier) AttemptInstantDDL() error {
+	query := this.generateInstantDDLQuery()
+	this.migrationContext.Log.Infof("INSTANT DDL query is: %s", query)
+	// We don't need a trx, because for instant DDL the SQL mode doesn't matter.
+	_, err := this.db.Exec(query)
+	return err
+}
+
 // CreateGhostTable creates the ghost table on the applier host
 func (this *Applier) CreateGhostTable() error {
 	query := fmt.Sprintf(`create /* gh-ost */ table %s.%s like %s.%s`,
@@ -1134,7 +1165,7 @@ func (this *Applier) ApplyDMLEventQueries(dmlEvents [](*binlog.BinlogDMLEvent))
 				}
 				result, err := tx.Exec(buildResult.query, buildResult.args...)
 				if err != nil {
-					err = fmt.Errorf("%s; query=%s; args=%+v", err.Error(), buildResult.query, buildResult.args)
+					err = fmt.Errorf("%w; query=%s; args=%+v", err, buildResult.query, buildResult.args)
 					return rollback(err)
 				}
 

go/logic/applier_test.go

@@ -170,3 +170,16 @@ func TestApplierBuildDMLEventQuery(t *testing.T) {
 		test.S(t).ExpectEquals(res[0].args[3], 42)
 	})
 }
+
+func TestApplierInstantDDL(t *testing.T) {
+	migrationContext := base.NewMigrationContext()
+	migrationContext.DatabaseName = "test"
+	migrationContext.OriginalTableName = "mytable"
+	migrationContext.AlterStatementOptions = "ADD INDEX (foo)"
+	applier := NewApplier(migrationContext)
+
+	t.Run("instantDDLstmt", func(t *testing.T) {
+		stmt := applier.generateInstantDDLQuery()
+		test.S(t).ExpectEquals(stmt, "ALTER /* gh-ost */ TABLE `test`.`mytable` ADD INDEX (foo), ALGORITHM=INSTANT")
+	})
+}

go/logic/hooks.go

@@ -7,6 +7,7 @@ package logic
 
 import (
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -34,18 +35,16 @@ const (
 
 type HooksExecutor struct {
 	migrationContext *base.MigrationContext
+	writer           io.Writer
 }
 
 func NewHooksExecutor(migrationContext *base.MigrationContext) *HooksExecutor {
 	return &HooksExecutor{
 		migrationContext: migrationContext,
+		writer:           os.Stderr,
 	}
 }
 
-func (this *HooksExecutor) initHooks() error {
-	return nil
-}
-
 func (this *HooksExecutor) applyEnvironmentVariables(extraVariables ...string) []string {
 	env := os.Environ()
 	env = append(env, fmt.Sprintf("GH_OST_DATABASE_NAME=%s", this.migrationContext.DatabaseName))
@@ -76,13 +75,13 @@ func (this *HooksExecutor) applyEnvironmentVariables(extraVariables ...string) [
 }
 
 // executeHook executes a command, and sets relevant environment variables
-// combined output & error are printed to gh-ost's standard error.
+// combined output & error are printed to the configured writer.
 func (this *HooksExecutor) executeHook(hook string, extraVariables ...string) error {
 	cmd := exec.Command(hook)
 	cmd.Env = this.applyEnvironmentVariables(extraVariables...)
 
 	combinedOutput, err := cmd.CombinedOutput()
-	fmt.Fprintln(os.Stderr, string(combinedOutput))
+	fmt.Fprintln(this.writer, string(combinedOutput))
 	return log.Errore(err)
 }
 

go/logic/hooks_test.go

@@ -0,0 +1,113 @@
+/*
+   Copyright 2022 GitHub Inc.
+         See https://github.com/github/gh-ost/blob/master/LICENSE
+*/
+
+package logic
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/openark/golib/tests"
+
+	"github.com/github/gh-ost/go/base"
+)
+
+func TestHooksExecutorExecuteHooks(t *testing.T) {
+	migrationContext := base.NewMigrationContext()
+	migrationContext.AlterStatement = "ENGINE=InnoDB"
+	migrationContext.DatabaseName = "test"
+	migrationContext.Hostname = "test.example.com"
+	migrationContext.OriginalTableName = "tablename"
+	migrationContext.RowsDeltaEstimate = 1
+	migrationContext.RowsEstimate = 122
+	migrationContext.TotalRowsCopied = 123456
+	migrationContext.SetETADuration(time.Minute)
+	migrationContext.SetProgressPct(50)
+	hooksExecutor := NewHooksExecutor(migrationContext)
+
+	writeTmpHookFunc := func(testName, hookName, script string) (path string, err error) {
+		if path, err = os.MkdirTemp("", testName); err != nil {
+			return path, err
+		}
+		err = os.WriteFile(filepath.Join(path, hookName), []byte(script), 0777)
+		return path, err
+	}
+
+	t.Run("does-not-exist", func(t *testing.T) {
+		migrationContext.HooksPath = "/does/not/exist"
+		tests.S(t).ExpectNil(hooksExecutor.executeHooks("test-hook"))
+	})
+
+	t.Run("failed", func(t *testing.T) {
+		var err error
+		if migrationContext.HooksPath, err = writeTmpHookFunc(
+			"TestHooksExecutorExecuteHooks-failed",
+			"failed-hook",
+			"#!/bin/sh\nexit 1",
+		); err != nil {
+			panic(err)
+		}
+		defer os.RemoveAll(migrationContext.HooksPath)
+		tests.S(t).ExpectNotNil(hooksExecutor.executeHooks("failed-hook"))
+	})
+
+	t.Run("success", func(t *testing.T) {
+		var err error
+		if migrationContext.HooksPath, err = writeTmpHookFunc(
+			"TestHooksExecutorExecuteHooks-success",
+			"success-hook",
+			"#!/bin/sh\nenv",
+		); err != nil {
+			panic(err)
+		}
+		defer os.RemoveAll(migrationContext.HooksPath)
+
+		var buf bytes.Buffer
+		hooksExecutor.writer = &buf
+		tests.S(t).ExpectNil(hooksExecutor.executeHooks("success-hook", "TEST="+t.Name()))
+
+		scanner := bufio.NewScanner(&buf)
+		for scanner.Scan() {
+			split := strings.SplitN(scanner.Text(), "=", 2)
+			switch split[0] {
+			case "GH_OST_COPIED_ROWS":
+				copiedRows, _ := strconv.ParseInt(split[1], 10, 64)
+				tests.S(t).ExpectEquals(copiedRows, migrationContext.TotalRowsCopied)
+			case "GH_OST_DATABASE_NAME":
+				tests.S(t).ExpectEquals(split[1], migrationContext.DatabaseName)
+			case "GH_OST_DDL":
+				tests.S(t).ExpectEquals(split[1], migrationContext.AlterStatement)
+			case "GH_OST_DRY_RUN":
+				tests.S(t).ExpectEquals(split[1], "false")
+			case "GH_OST_ESTIMATED_ROWS":
+				estimatedRows, _ := strconv.ParseInt(split[1], 10, 64)
+				tests.S(t).ExpectEquals(estimatedRows, int64(123))
+			case "GH_OST_ETA_SECONDS":
+				etaSeconds, _ := strconv.ParseInt(split[1], 10, 64)
+				tests.S(t).ExpectEquals(etaSeconds, int64(60))
+			case "GH_OST_EXECUTING_HOST":
+				tests.S(t).ExpectEquals(split[1], migrationContext.Hostname)
+			case "GH_OST_GHOST_TABLE_NAME":
+				tests.S(t).ExpectEquals(split[1], fmt.Sprintf("_%s_gho", migrationContext.OriginalTableName))
+			case "GH_OST_OLD_TABLE_NAME":
+				tests.S(t).ExpectEquals(split[1], fmt.Sprintf("_%s_del", migrationContext.OriginalTableName))
+			case "GH_OST_PROGRESS":
+				progress, _ := strconv.ParseFloat(split[1], 64)
+				tests.S(t).ExpectEquals(progress, 50.0)
+			case "GH_OST_TABLE_NAME":
+				tests.S(t).ExpectEquals(split[1], migrationContext.OriginalTableName)
+			case "TEST":
+				tests.S(t).ExpectEquals(split[1], t.Name())
+			}
+		}
+	})
+}

go/logic/inspect.go

@@ -8,6 +8,7 @@ package logic
 import (
 	"context"
 	gosql "database/sql"
+	"errors"
 	"fmt"
 	"reflect"
 	"strings"
@@ -554,13 +555,11 @@ func (this *Inspector) CountTableRows(ctx context.Context) error {
 	query := fmt.Sprintf(`select /* gh-ost */ count(*) as count_rows from %s.%s`, sql.EscapeName(this.migrationContext.DatabaseName), sql.EscapeName(this.migrationContext.OriginalTableName))
 	var rowsEstimate int64
 	if err := conn.QueryRowContext(ctx, query).Scan(&rowsEstimate); err != nil {
-		switch err {
+		if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
-		case context.Canceled, context.DeadlineExceeded:
 			this.migrationContext.Log.Infof("exact row count cancelled (%s), likely because I'm about to cut over. I'm going to kill that query.", ctx.Err())
 			return mysql.Kill(this.db, connectionID)
-		default:
-			return err
 		}
+		return err
 	}
 
 	// row count query finished. nil out the cancel func, so the main migration thread

go/logic/migrator.go

@@ -98,6 +98,7 @@ type Migrator struct {
 func NewMigrator(context *base.MigrationContext, appVersion string) *Migrator {
 	migrator := &Migrator{
 		appVersion:                 appVersion,
+		hooksExecutor:              NewHooksExecutor(context),
 		migrationContext:           context,
 		parser:                     sql.NewAlterTableParser(),
 		ghostTableMigrated:         make(chan bool),
@@ -113,15 +114,6 @@ func NewMigrator(context *base.MigrationContext, appVersion string) *Migrator {
 	return migrator
 }
 
-// initiateHooksExecutor
-func (this *Migrator) initiateHooksExecutor() (err error) {
-	this.hooksExecutor = NewHooksExecutor(this.migrationContext)
-	if err := this.hooksExecutor.initHooks(); err != nil {
-		return err
-	}
-	return nil
-}
-
 // sleepWhileTrue sleeps indefinitely until the given function returns 'false'
 // (or fails with error)
 func (this *Migrator) sleepWhileTrue(operation func() (bool, error)) error {
@@ -342,9 +334,6 @@ func (this *Migrator) Migrate() (err error) {
 
 	go this.listenOnPanicAbort()
 
-	if err := this.initiateHooksExecutor(); err != nil {
-		return err
-	}
 	if err := this.hooksExecutor.onStartup(); err != nil {
 		return err
 	}
@@ -371,6 +360,17 @@ func (this *Migrator) Migrate() (err error) {
 	if err := this.createFlagFiles(); err != nil {
 		return err
 	}
+	// In MySQL 8.0 (and possibly earlier) some DDL statements can be applied instantly.
+	// Attempt to do this if AttemptInstantDDL is set.
+	if this.migrationContext.AttemptInstantDDL {
+		this.migrationContext.Log.Infof("Attempting to execute alter with ALGORITHM=INSTANT")
+		if err := this.applier.AttemptInstantDDL(); err == nil {
+			this.migrationContext.Log.Infof("Success! table %s.%s migrated instantly", sql.EscapeName(this.migrationContext.DatabaseName), sql.EscapeName(this.migrationContext.OriginalTableName))
+			return nil
+		} else {
+			this.migrationContext.Log.Infof("ALGORITHM=INSTANT not supported for this operation, proceeding with original algorithm: %s", err)
+		}
+	}
 
 	initialLag, _ := this.inspector.getReplicationLag()
 	this.migrationContext.Log.Infof("Waiting for ghost table to be migrated. Current lag is %+v", initialLag)
@@ -402,9 +402,9 @@ func (this *Migrator) Migrate() (err error) {
 	if err := this.applier.ReadMigrationRangeValues(); err != nil {
 		return err
 	}
-	if err := this.initiateThrottler(); err != nil {
+
-		return err
+	this.initiateThrottler()
-	}
+
 	if err := this.hooksExecutor.onBeforeRowCopy(); err != nil {
 		return err
 	}
@@ -1047,6 +1047,7 @@ func (this *Migrator) printStatus(rule PrintStatusRule, writers ...io.Writer) {
 	)
 	w := io.MultiWriter(writers...)
 	fmt.Fprintln(w, status)
+	this.migrationContext.Log.Infof(status)
 
 	hooksStatusIntervalSec := this.migrationContext.HooksStatusIntervalSec
 	if hooksStatusIntervalSec > 0 && elapsedSeconds%hooksStatusIntervalSec == 0 {
@@ -1107,7 +1108,7 @@ func (this *Migrator) addDMLEventsListener() error {
 }
 
 // initiateThrottler kicks in the throttling collection and the throttling checks.
-func (this *Migrator) initiateThrottler() error {
+func (this *Migrator) initiateThrottler() {
 	this.throttler = NewThrottler(this.migrationContext, this.applier, this.inspector, this.appVersion)
 
 	go this.throttler.initiateThrottlerCollection(this.firstThrottlingCollected)
@@ -1117,8 +1118,6 @@ func (this *Migrator) initiateThrottler() error {
 	<-this.firstThrottlingCollected // other, general metrics
 	this.migrationContext.Log.Infof("First throttle metrics collected")
 	go this.throttler.initiateThrottlerChecks()
-
-	return nil
 }
 
 func (this *Migrator) initiateApplier() error {

go/logic/throttler.go

@@ -308,6 +308,8 @@ func (this *Throttler) collectThrottleHTTPStatus(firstThrottlingCollected chan<-
 		if err != nil {
 			return false, err
 		}
+		defer resp.Body.Close()
+
 		atomic.StoreInt64(&this.migrationContext.ThrottleHTTPStatusCode, int64(resp.StatusCode))
 		return false, nil
 	}

go/sql/parser.go

@@ -62,7 +62,7 @@ func NewParserFromAlterStatement(alterStatement string) *AlterTableParser {
 	return parser
 }
 
-func (this *AlterTableParser) tokenizeAlterStatement(alterStatement string) (tokens []string, err error) {
+func (this *AlterTableParser) tokenizeAlterStatement(alterStatement string) (tokens []string) {
 	terminatingQuote := rune(0)
 	f := func(c rune) bool {
 		switch {
@@ -86,7 +86,7 @@ func (this *AlterTableParser) tokenizeAlterStatement(alterStatement string) (tok
 	for i := range tokens {
 		tokens[i] = strings.TrimSpace(tokens[i])
 	}
-	return tokens, nil
+	return tokens
 }
 
 func (this *AlterTableParser) sanitizeQuotesFromAlterStatement(alterStatement string) (strippedStatement string) {
@@ -95,7 +95,7 @@ func (this *AlterTableParser) sanitizeQuotesFromAlterStatement(alterStatement st
 	return strippedStatement
 }
 
-func (this *AlterTableParser) parseAlterToken(alterToken string) (err error) {
+func (this *AlterTableParser) parseAlterToken(alterToken string) {
 	{
 		// rename
 		allStringSubmatch := renameColumnRegexp.FindAllStringSubmatch(alterToken, -1)
@@ -131,7 +131,6 @@ func (this *AlterTableParser) parseAlterToken(alterToken string) (err error) {
 			this.isAutoIncrementDefined = true
 		}
 	}
-	return nil
 }
 
 func (this *AlterTableParser) ParseAlterStatement(alterStatement string) (err error) {
@@ -151,8 +150,7 @@ func (this *AlterTableParser) ParseAlterStatement(alterStatement string) (err er
 			break
 		}
 	}
-	alterTokens, _ := this.tokenizeAlterStatement(this.alterStatementOptions)
+	for _, alterToken := range this.tokenizeAlterStatement(this.alterStatementOptions) {
-	for _, alterToken := range alterTokens {
 		alterToken = this.sanitizeQuotesFromAlterStatement(alterToken)
 		this.parseAlterToken(alterToken)
 		this.alterTokens = append(this.alterTokens, alterToken)

go/sql/parser_test.go

@@ -99,37 +99,37 @@ func TestTokenizeAlterStatement(t *testing.T) {
 	parser := NewAlterTableParser()
 	{
 		alterStatement := "add column t int"
-		tokens, _ := parser.tokenizeAlterStatement(alterStatement)
+		tokens := parser.tokenizeAlterStatement(alterStatement)
 		test.S(t).ExpectTrue(reflect.DeepEqual(tokens, []string{"add column t int"}))
 	}
 	{
 		alterStatement := "add column t int, change column i int"
-		tokens, _ := parser.tokenizeAlterStatement(alterStatement)
+		tokens := parser.tokenizeAlterStatement(alterStatement)
 		test.S(t).ExpectTrue(reflect.DeepEqual(tokens, []string{"add column t int", "change column i int"}))
 	}
 	{
 		alterStatement := "add column t int, change column i int 'some comment'"
-		tokens, _ := parser.tokenizeAlterStatement(alterStatement)
+		tokens := parser.tokenizeAlterStatement(alterStatement)
 		test.S(t).ExpectTrue(reflect.DeepEqual(tokens, []string{"add column t int", "change column i int 'some comment'"}))
 	}
 	{
 		alterStatement := "add column t int, change column i int 'some comment, with comma'"
-		tokens, _ := parser.tokenizeAlterStatement(alterStatement)
+		tokens := parser.tokenizeAlterStatement(alterStatement)
 		test.S(t).ExpectTrue(reflect.DeepEqual(tokens, []string{"add column t int", "change column i int 'some comment, with comma'"}))
 	}
 	{
 		alterStatement := "add column t int, add column d decimal(10,2)"
-		tokens, _ := parser.tokenizeAlterStatement(alterStatement)
+		tokens := parser.tokenizeAlterStatement(alterStatement)
 		test.S(t).ExpectTrue(reflect.DeepEqual(tokens, []string{"add column t int", "add column d decimal(10,2)"}))
 	}
 	{
 		alterStatement := "add column t int, add column e enum('a','b','c')"
-		tokens, _ := parser.tokenizeAlterStatement(alterStatement)
+		tokens := parser.tokenizeAlterStatement(alterStatement)
 		test.S(t).ExpectTrue(reflect.DeepEqual(tokens, []string{"add column t int", "add column e enum('a','b','c')"}))
 	}
 	{
 		alterStatement := "add column t int(11), add column e enum('a','b','c')"
-		tokens, _ := parser.tokenizeAlterStatement(alterStatement)
+		tokens := parser.tokenizeAlterStatement(alterStatement)
 		test.S(t).ExpectTrue(reflect.DeepEqual(tokens, []string{"add column t int(11)", "add column e enum('a','b','c')"}))
 	}
 }

localtests/attempt-instant-ddl/create.sql

@@ -0,0 +1,13 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  i int not null,
+  color varchar(32),
+  primary key(id)
+) auto_increment=1;
+
+drop event if exists gh_ost_test;
+
+insert into gh_ost_test values (null, 11, 'red');
+insert into gh_ost_test values (null, 13, 'green');
+insert into gh_ost_test values (null, 17, 'blue');

localtests/attempt-instant-ddl/extra_args

@@ -0,0 +1 @@
+--attempt-instant-ddl

localtests/convert-utf8mb4/create.sql

@@ -7,9 +7,6 @@ create table gh_ost_test (
   primary key(id)
 ) auto_increment=1;
 
-insert into gh_ost_test values (null, 'átesting');
-
-
 insert into gh_ost_test values (null, 'Hello world, Καλημέρα κόσμε, コンニチハ', 'átesting0', 'initial');
 
 drop event if exists gh_ost_test;

localtests/test.sh

@@ -117,6 +117,14 @@ test_single() {
   fi
 
   gh-ost-test-mysql-master --default-character-set=utf8mb4 test < $tests_path/$test_name/create.sql
+  test_create_result=$?
+
+  if [ $test_create_result -ne 0 ] ; then
+    echo
+    echo "ERROR $test_name create failure. cat $tests_path/$test_name/create.sql:"
+    cat $tests_path/$test_name/create.sql
+    return 1
+  fi
 
   extra_args=""
   if [ -f $tests_path/$test_name/extra_args ] ; then
@@ -255,7 +263,7 @@ build_binary() {
 
 test_all() {
   build_binary
-  find $tests_path ! -path . -type d -mindepth 1 -maxdepth 1 | cut -d "/" -f 3 | egrep "$test_pattern" | while read test_name ; do
+  find $tests_path ! -path . -type d -mindepth 1 -maxdepth 1 | cut -d "/" -f 3 | egrep "$test_pattern" | sort | while read test_name ; do
     test_single "$test_name"
     if [ $? -ne 0 ] ; then
       create_statement=$(gh-ost-test-mysql-replica test -t -e "show create table _gh_ost_test_gho \G")

script/test

@@ -14,4 +14,4 @@ script/build
 cd .gopath/src/github.com/github/gh-ost
 
 echo "Running unit tests"
-go test ./go/...
+go test -v -covermode=atomic ./go/...