Merge branch 'master' into test-latin1text

README.md

@@ -84,7 +84,7 @@ But then a rare genetic mutation happened, and the `c` transformed into `t`. And
 
 We develop `gh-ost` at GitHub and for the community. We may have different priorities than others. From time to time we may suggest a contribution that is not on our immediate roadmap but which may appeal to others.
 
-Please see [Coding gh-ost](https://github.com/github/gh-ost/blob/develdocs/doc/coding-ghost.md) for a guide to getting started developing with gh-ost.
+Please see [Coding gh-ost](doc/coding-ghost.md) for a guide to getting started developing with gh-ost.
 
 ## Download/binaries/source
 

RELEASE_VERSION

@@ -1 +1 @@
-1.0.36
+1.0.42

doc/cheatsheet.md

@@ -1,11 +1,13 @@
 # Cheatsheet
 
+### Operation modes
+
 ![operation modes](images/gh-ost-operation-modes.png)
 
 
 `gh-ost` operates by connecting to potentially multiple servers, as well as imposing itself as a replica in order to streamline binary log events directly from one of those servers. There are various operation modes, which depend on your setup, configuration, and where you want to run the migration.
 
-### a. Connect to replica, migrate on master
+#### a. Connect to replica, migrate on master
 
 This is the mode `gh-ost` expects by default. `gh-ost` will investigate the replica, crawl up to find the topology's master, and will hook onto it as well. Migration will:
 
@@ -47,7 +49,7 @@ gh-ost \
 With `--execute`, migration actually copies data and flips tables. Without it this is a `noop` run.
 
 
-### b. Connect to master
+#### b. Connect to master
 
 If you don't have replicas, or do not wish to use them, you are still able to operate directly on the master. `gh-ost` will do all operations directly on the master. You may still ask it to be considerate of replication lag.
 
@@ -80,7 +82,7 @@ gh-ost \
 [--execute]
 ```
 
-### c. Migrate/test on replica
+#### c. Migrate/test on replica
 
 This will perform a migration on the replica. `gh-ost` will briefly connect to the master but will thereafter perform all operations on the replica without modifying anything on the master.
 Throughout the operation, `gh-ost` will throttle such that the replica is up to date.
@@ -146,7 +148,7 @@ gh-ost --allow-master-master --assume-master-host=a.specific.master.com
 
 Topologies using _tungsten replicator_ are peculiar in that the participating servers are not actually aware they are replicating. The _tungsten replicator_ looks just like another app issuing queries on those hosts. `gh-ost` is unable to identify that a server participates in a _tungsten_ topology.
 
-If you choose to migrate directly on master (see above), there's nothing special you need to do. 
+If you choose to migrate directly on master (see above), there's nothing special you need to do.
 
 If you choose to migrate via replica, then you need to make sure Tungsten is configured with log-slave-updates parameter (note this is different from MySQL's own log-slave-updates parameter), otherwise changes will not be in the replica's binlog, causing data to be corrupted after table swap. You must also supply the identity of the master, and indicate this is a tungsten setup, as follows:
 
@@ -155,3 +157,15 @@ gh-ost --tungsten --assume-master-host=the.topology.master.com
 ```
 
 Also note that `--switch-to-rbr` does not work for a Tungsten setup as the replication process is external, so you need to make sure `binlog_format` is set to ROW before Tungsten Replicator connects to the server and starts applying events from the master.
+
+### Concurrent migrations
+
+It is possible to run concurrent `gh-ost` migrations.
+
+- Never on the exact same table.
+- If running on different replicas, (e.g. `table1` on `replica1` and `table2` on `replica2`) then no further configuration required.
+- If running from same server (binaries run on same server, regardless of which replica/replicas are used):
+  - Make sure not to specify same `-serve-socket-file` (or let `gh-ost` pick one for you).
+  - You may choose to use same `-throttle-flag-file` (preferably use `-throttle-additional-flag-file`, this is exactly the reason there's two, this latter file is for sharing).
+  - You may choose to use same `-panic-flag-file`. This all depends on your flow and how you'd like to control your migrations.
+- If using same inspected box (either master or replica, `--host=everyone.uses.this.host`) then for each `gh-ost` process you must also provide a different, unique `--replica-server-id`. Optionally use process ID (`$$` in shell) ; but it's on you to choose a number that does not collide with another `gh-ost` or another running replica.

doc/questions.md

@@ -23,4 +23,8 @@ At this time there is no equivalent to `ALTER IGNORE`, where duplicates are impl
 
 It is therefore unlikely that `gh-ost` will support this behavior.
 
+### Run concurrent migrations?
+
+Yes. TL;DR if running all on same replica/master, make sure to provide `--replica-server-id`. [Read more](cheatsheet.md#concurrent-migrations)
+
 # Why

doc/requirements-and-limitations.md

@@ -28,7 +28,9 @@ The `SUPER` privilege is required for `STOP SLAVE`, `START SLAVE` operations. Th
 
 - MySQL 5.7 generated columns are not supported. They may be supported in the future.
 
-- MySQL 5.7 `JSON` columns are not supported. They are likely to be supported shortly.
+- MySQL 5.7 `POINT` column type is not supported.
+
+- MySQL 5.7 `JSON` columns are supported but not as part of `PRIMARY KEY`
 
 - The two _before_ & _after_ tables must share a `PRIMARY KEY` or other `UNIQUE KEY`. This key will be used by `gh-ost` to iterate through the table rows when copying. [Read more](shared-key.md)
   - The migration key must not include columns with NULL values. This means either:

go/base/context.go

@@ -192,6 +192,7 @@ type MigrationContext struct {
 	Iteration                        int64
 	MigrationIterationRangeMinValues *sql.ColumnValues
 	MigrationIterationRangeMaxValues *sql.ColumnValues
+	ForceTmpTableName                string
 
 	recentBinlogCoordinates mysql.BinlogCoordinates
 
@@ -253,25 +254,42 @@ func getSafeTableName(baseName string, suffix string) string {
 }
 
 // GetGhostTableName generates the name of ghost table, based on original table name
+// or a given table name
 func (this *MigrationContext) GetGhostTableName() string {
-	return getSafeTableName(this.OriginalTableName, "gho")
+	if this.ForceTmpTableName != "" {
+		return getSafeTableName(this.ForceTmpTableName, "gho")
+	} else {
+		return getSafeTableName(this.OriginalTableName, "gho")
+	}
 }
 
 // GetOldTableName generates the name of the "old" table, into which the original table is renamed.
 func (this *MigrationContext) GetOldTableName() string {
+	var tableName string
+	if this.ForceTmpTableName != "" {
+		tableName = this.ForceTmpTableName
+	} else {
+		tableName = this.OriginalTableName
+	}
+
 	if this.TimestampOldTable {
 		t := this.StartTime
 		timestamp := fmt.Sprintf("%d%02d%02d%02d%02d%02d",
 			t.Year(), t.Month(), t.Day(),
 			t.Hour(), t.Minute(), t.Second())
-		return getSafeTableName(this.OriginalTableName, fmt.Sprintf("%s_del", timestamp))
+		return getSafeTableName(tableName, fmt.Sprintf("%s_del", timestamp))
 	}
-	return getSafeTableName(this.OriginalTableName, "del")
+	return getSafeTableName(tableName, "del")
 }
 
 // GetChangelogTableName generates the name of changelog table, based on original table name
+// or a given table name.
 func (this *MigrationContext) GetChangelogTableName() string {
-	return getSafeTableName(this.OriginalTableName, "ghc")
+	if this.ForceTmpTableName != "" {
+		return getSafeTableName(this.ForceTmpTableName, "ghc")
+	} else {
+		return getSafeTableName(this.OriginalTableName, "ghc")
+	}
 }
 
 // GetVoluntaryLockName returns a name of a voluntary lock to be used throughout
@@ -682,7 +700,7 @@ func (this *MigrationContext) ReadConfigFile() error {
 	gcfg.RelaxedParserMode = true
 	gcfgscanner.RelaxedScannerMode = true
 	if err := gcfg.ReadFileInto(&this.config, this.ConfigFile); err != nil {
-		return err
+		return fmt.Errorf("Error reading config file %s. Details: %s", this.ConfigFile, err.Error())
 	}
 
 	// We accept user & password in the form "${SOME_ENV_VARIABLE}" in which case we pull

go/base/context_test.go

@@ -18,25 +18,28 @@ func init() {
 }
 
 func TestGetTableNames(t *testing.T) {
-	context = newMigrationContext()
 	{
+		context = newMigrationContext()
 		context.OriginalTableName = "some_table"
 		test.S(t).ExpectEquals(context.GetOldTableName(), "_some_table_del")
 		test.S(t).ExpectEquals(context.GetGhostTableName(), "_some_table_gho")
 		test.S(t).ExpectEquals(context.GetChangelogTableName(), "_some_table_ghc")
 	}
 	{
+		context = newMigrationContext()
 		context.OriginalTableName = "a123456789012345678901234567890123456789012345678901234567890"
 		test.S(t).ExpectEquals(context.GetOldTableName(), "_a1234567890123456789012345678901234567890123456789012345678_del")
 		test.S(t).ExpectEquals(context.GetGhostTableName(), "_a1234567890123456789012345678901234567890123456789012345678_gho")
 		test.S(t).ExpectEquals(context.GetChangelogTableName(), "_a1234567890123456789012345678901234567890123456789012345678_ghc")
 	}
 	{
+		context = newMigrationContext()
 		context.OriginalTableName = "a123456789012345678901234567890123456789012345678901234567890123"
 		oldTableName := context.GetOldTableName()
 		test.S(t).ExpectEquals(oldTableName, "_a1234567890123456789012345678901234567890123456789012345678_del")
 	}
 	{
+		context = newMigrationContext()
 		context.OriginalTableName = "a123456789012345678901234567890123456789012345678901234567890123"
 		context.TimestampOldTable = true
 		longForm := "Jan 2, 2006 at 3:04pm (MST)"
@@ -44,4 +47,12 @@ func TestGetTableNames(t *testing.T) {
 		oldTableName := context.GetOldTableName()
 		test.S(t).ExpectEquals(oldTableName, "_a1234567890123456789012345678901234567890123_20130203195400_del")
 	}
+	{
+		context = newMigrationContext()
+		context.OriginalTableName = "foo_bar_baz"
+		context.ForceTmpTableName = "tmp"
+		test.S(t).ExpectEquals(context.GetOldTableName(), "_tmp_del")
+		test.S(t).ExpectEquals(context.GetGhostTableName(), "_tmp_gho")
+		test.S(t).ExpectEquals(context.GetChangelogTableName(), "_tmp_ghc")
+	}
 }

go/base/utils.go

@@ -11,6 +11,10 @@ import (
 	"regexp"
 	"strings"
 	"time"
+
+	gosql "database/sql"
+	"github.com/github/gh-ost/go/mysql"
+	"github.com/outbrain/golib/log"
 )
 
 var (
@@ -50,3 +54,25 @@ func StringContainsAll(s string, substrings ...string) bool {
 	}
 	return nonEmptyStringsFound
 }
+
+func ValidateConnection(db *gosql.DB, connectionConfig *mysql.ConnectionConfig) (string, error) {
+	query := `select @@global.port, @@global.version`
+	var port, extraPort int
+	var version string
+	if err := db.QueryRow(query).Scan(&port, &version); err != nil {
+		return "", err
+	}
+	extraPortQuery := `select @@global.extra_port`
+	if err := db.QueryRow(extraPortQuery).Scan(&extraPort); err != nil {
+		// swallow this error. not all servers support extra_port
+	}
+
+	if connectionConfig.Key.Port == port || (extraPort > 0 && connectionConfig.Key.Port == extraPort) {
+		log.Infof("connection validated on %+v", connectionConfig.Key)
+		return version, nil
+	} else if extraPort == 0 {
+		return "", fmt.Errorf("Unexpected database port reported: %+v", port)
+	} else {
+		return "", fmt.Errorf("Unexpected database port reported: %+v / extra_port: %+v", port, extraPort)
+	}
+}

go/cmd/gh-ost/main.go

@@ -63,7 +63,7 @@ func main() {
 	flag.BoolVar(&migrationContext.AllowedRunningOnMaster, "allow-on-master", false, "allow this migration to run directly on master. Preferably it would run on a replica")
 	flag.BoolVar(&migrationContext.AllowedMasterMaster, "allow-master-master", false, "explicitly allow running in a master-master setup")
 	flag.BoolVar(&migrationContext.NullableUniqueKeyAllowed, "allow-nullable-unique-key", false, "allow gh-ost to migrate based on a unique key with nullable columns. As long as no NULL values exist, this should be OK. If NULL values exist in chosen key, data may be corrupted. Use at your own risk!")
-	flag.BoolVar(&migrationContext.ApproveRenamedColumns, "approve-renamed-columns", false, "in case your `ALTER` statement renames columns, gh-ost will note that and offer its interpretation of the rename. By default gh-ost does not proceed to execute. This flag approves that gh-ost's interpretation si correct")
+	flag.BoolVar(&migrationContext.ApproveRenamedColumns, "approve-renamed-columns", false, "in case your `ALTER` statement renames columns, gh-ost will note that and offer its interpretation of the rename. By default gh-ost does not proceed to execute. This flag approves that gh-ost's interpretation is correct")
 	flag.BoolVar(&migrationContext.SkipRenamedColumns, "skip-renamed-columns", false, "in case your `ALTER` statement renames columns, gh-ost will note that and offer its interpretation of the rename. By default gh-ost does not proceed to execute. This flag tells gh-ost to skip the renamed columns, i.e. to treat what gh-ost thinks are renamed columns as unrelated columns. NOTE: you may lose column data")
 	flag.BoolVar(&migrationContext.IsTungsten, "tungsten", false, "explicitly let gh-ost know that you are running on a tungsten-replication based topology (you are likely to also provide --assume-master-host)")
 	flag.BoolVar(&migrationContext.DiscardForeignKeys, "discard-foreign-keys", false, "DANGER! This flag will migrate a table that has foreign keys and will NOT create foreign keys on the ghost table, thus your altered table will have NO foreign keys. This is useful for intentional dropping of foreign keys")
@@ -120,6 +120,7 @@ func main() {
 	help := flag.Bool("help", false, "Display usage")
 	version := flag.Bool("version", false, "Print version & exit")
 	checkFlag := flag.Bool("check-flag", false, "Check if another flag exists/supported. This allows for cross-version scripting. Exits with 0 when all additional provided flags exist, nonzero otherwise. You must provide (dummy) values for flags that require a value. Example: gh-ost --check-flag --cut-over-lock-timeout-seconds --nice-ratio 0")
+	flag.StringVar(&migrationContext.ForceTmpTableName, "force-table-names", "", "table name prefix to be used on the temporary tables")
 
 	flag.Parse()
 

go/logic/applier.go

@@ -53,12 +53,14 @@ func (this *Applier) InitDBConnections() (err error) {
 		return err
 	}
 	this.singletonDB.SetMaxOpenConns(1)
-	if err := this.validateConnection(this.db); err != nil {
+	version, err := base.ValidateConnection(this.db, this.connectionConfig)
+	if err != nil {
 		return err
 	}
-	if err := this.validateConnection(this.singletonDB); err != nil {
+	if _, err := base.ValidateConnection(this.singletonDB, this.connectionConfig); err != nil {
 		return err
 	}
+	this.migrationContext.ApplierMySQLVersion = version
 	if err := this.validateAndReadTimeZone(); err != nil {
 		return err
 	}
@@ -74,20 +76,6 @@ func (this *Applier) InitDBConnections() (err error) {
 	return nil
 }
 
-// validateConnection issues a simple can-connect to MySQL
-func (this *Applier) validateConnection(db *gosql.DB) error {
-	query := `select @@global.port, @@global.version`
-	var port int
-	if err := db.QueryRow(query).Scan(&port, &this.migrationContext.ApplierMySQLVersion); err != nil {
-		return err
-	}
-	if port != this.connectionConfig.Key.Port {
-		return fmt.Errorf("Unexpected database port reported: %+v", port)
-	}
-	log.Infof("connection validated on %+v", this.connectionConfig.Key)
-	return nil
-}
-
 // validateAndReadTimeZone potentially reads server time-zone
 func (this *Applier) validateAndReadTimeZone() error {
 	query := `select @@global.time_zone`
@@ -200,7 +188,7 @@ func (this *Applier) CreateChangelogTable() error {
 			id bigint auto_increment,
 			last_update timestamp not null DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
 			hint varchar(64) charset ascii not null,
-			value varchar(255) charset ascii not null,
+			value varchar(4096) charset ascii not null,
 			primary key(id),
 			unique key hint_uidx(hint)
 		) auto_increment=256
@@ -398,35 +386,41 @@ func (this *Applier) CalculateNextIterationRangeEndValues() (hasFurtherRange boo
 	if this.migrationContext.MigrationIterationRangeMinValues == nil {
 		this.migrationContext.MigrationIterationRangeMinValues = this.migrationContext.MigrationRangeMinValues
 	}
-	query, explodedArgs, err := sql.BuildUniqueKeyRangeEndPreparedQuery(
-		this.migrationContext.DatabaseName,
-		this.migrationContext.OriginalTableName,
-		&this.migrationContext.UniqueKey.Columns,
-		this.migrationContext.MigrationIterationRangeMinValues.AbstractValues(),
-		this.migrationContext.MigrationRangeMaxValues.AbstractValues(),
-		atomic.LoadInt64(&this.migrationContext.ChunkSize),
-		this.migrationContext.GetIteration() == 0,
-		fmt.Sprintf("iteration:%d", this.migrationContext.GetIteration()),
-	)
-	if err != nil {
-		return hasFurtherRange, err
-	}
-	rows, err := this.db.Query(query, explodedArgs...)
-	if err != nil {
-		return hasFurtherRange, err
-	}
-	iterationRangeMaxValues := sql.NewColumnValues(this.migrationContext.UniqueKey.Len())
-	for rows.Next() {
-		if err = rows.Scan(iterationRangeMaxValues.ValuesPointers...); err != nil {
+	for i := 0; i < 2; i++ {
+		buildFunc := sql.BuildUniqueKeyRangeEndPreparedQueryViaOffset
+		if i == 1 {
+			buildFunc = sql.BuildUniqueKeyRangeEndPreparedQueryViaTemptable
+		}
+		query, explodedArgs, err := buildFunc(
+			this.migrationContext.DatabaseName,
+			this.migrationContext.OriginalTableName,
+			&this.migrationContext.UniqueKey.Columns,
+			this.migrationContext.MigrationIterationRangeMinValues.AbstractValues(),
+			this.migrationContext.MigrationRangeMaxValues.AbstractValues(),
+			atomic.LoadInt64(&this.migrationContext.ChunkSize),
+			this.migrationContext.GetIteration() == 0,
+			fmt.Sprintf("iteration:%d", this.migrationContext.GetIteration()),
+		)
+		if err != nil {
 			return hasFurtherRange, err
 		}
-		hasFurtherRange = true
+		rows, err := this.db.Query(query, explodedArgs...)
+		if err != nil {
+			return hasFurtherRange, err
+		}
+		iterationRangeMaxValues := sql.NewColumnValues(this.migrationContext.UniqueKey.Len())
+		for rows.Next() {
+			if err = rows.Scan(iterationRangeMaxValues.ValuesPointers...); err != nil {
+				return hasFurtherRange, err
+			}
+			hasFurtherRange = true
+		}
+		if hasFurtherRange {
+			this.migrationContext.MigrationIterationRangeMaxValues = iterationRangeMaxValues
+			return hasFurtherRange, nil
+		}
 	}
-	if !hasFurtherRange {
-		log.Debugf("Iteration complete: no further range to iterate")
-		return hasFurtherRange, nil
-	}
-	this.migrationContext.MigrationIterationRangeMaxValues = iterationRangeMaxValues
+	log.Debugf("Iteration complete: no further range to iterate")
 	return hasFurtherRange, nil
 }
 

go/logic/inspect.go

@@ -121,10 +121,33 @@ func (this *Inspector) inspectOriginalAndGhostTables() (err error) {
 	if err != nil {
 		return err
 	}
-	if len(sharedUniqueKeys) == 0 {
+	for i, sharedUniqueKey := range sharedUniqueKeys {
+		this.applyColumnTypes(this.migrationContext.DatabaseName, this.migrationContext.OriginalTableName, &sharedUniqueKey.Columns)
+		uniqueKeyIsValid := true
+		for _, column := range sharedUniqueKey.Columns.Columns() {
+			switch column.Type {
+			case sql.FloatColumnType:
+				{
+					log.Warning("Will not use %+v as shared key due to FLOAT data type", sharedUniqueKey.Name)
+					uniqueKeyIsValid = false
+				}
+			case sql.JSONColumnType:
+				{
+					// Noteworthy that at this time MySQL does not allow JSON indexing anyhow, but this code
+					// will remain in place to potentially handle the future case where JSON is supported in indexes.
+					log.Warning("Will not use %+v as shared key due to JSON data type", sharedUniqueKey.Name)
+					uniqueKeyIsValid = false
+				}
+			}
+		}
+		if uniqueKeyIsValid {
+			this.migrationContext.UniqueKey = sharedUniqueKeys[i]
+			break
+		}
+	}
+	if this.migrationContext.UniqueKey == nil {
 		return fmt.Errorf("No shared unique key can be found after ALTER! Bailing out")
 	}
-	this.migrationContext.UniqueKey = sharedUniqueKeys[0]
 	log.Infof("Chosen shared unique key is %s", this.migrationContext.UniqueKey.Name)
 	if this.migrationContext.UniqueKey.HasNullable {
 		if this.migrationContext.NullableUniqueKeyAllowed {
@@ -169,16 +192,13 @@ func (this *Inspector) inspectOriginalAndGhostTables() (err error) {
 
 // validateConnection issues a simple can-connect to MySQL
 func (this *Inspector) validateConnection() error {
-	query := `select @@global.port, @@global.version`
-	var port int
-	if err := this.db.QueryRow(query).Scan(&port, &this.migrationContext.InspectorMySQLVersion); err != nil {
-		return err
+	if len(this.connectionConfig.Password) > mysql.MaxReplicationPasswordLength {
+		return fmt.Errorf("MySQL replication length limited to 32 characters. See https://dev.mysql.com/doc/refman/5.7/en/assigning-passwords.html")
 	}
-	if port != this.connectionConfig.Key.Port {
-		return fmt.Errorf("Unexpected database port reported: %+v", port)
-	}
-	log.Infof("connection validated on %+v", this.connectionConfig.Key)
-	return nil
+
+	version, err := base.ValidateConnection(this.db, this.connectionConfig)
+	this.migrationContext.InspectorMySQLVersion = version
+	return err
 }
 
 // validateGrants verifies the user by which we're executing has necessary grants
@@ -545,6 +565,16 @@ func (this *Inspector) applyColumnTypes(databaseName, tableName string, columnsL
 				columnsList.GetColumn(columnName).Type = sql.DateTimeColumnType
 			}
 		}
+		if strings.Contains(columnType, "json") {
+			for _, columnsList := range columnsLists {
+				columnsList.GetColumn(columnName).Type = sql.JSONColumnType
+			}
+		}
+		if strings.Contains(columnType, "float") {
+			for _, columnsList := range columnsLists {
+				columnsList.GetColumn(columnName).Type = sql.FloatColumnType
+			}
+		}
 		if strings.HasPrefix(columnType, "enum") {
 			for _, columnsList := range columnsLists {
 				columnsList.GetColumn(columnName).Type = sql.EnumColumnType

go/logic/migrator.go

@@ -10,10 +10,8 @@ import (
 	"io"
 	"math"
 	"os"
-	"os/signal"
 	"strings"
 	"sync/atomic"
-	"syscall"
 	"time"
 
 	"github.com/github/gh-ost/go/base"
@@ -103,21 +101,6 @@ func NewMigrator() *Migrator {
 	return migrator
 }
 
-// acceptSignals registers for OS signals
-func (this *Migrator) acceptSignals() {
-	c := make(chan os.Signal, 1)
-
-	signal.Notify(c, syscall.SIGHUP)
-	go func() {
-		for sig := range c {
-			switch sig {
-			case syscall.SIGHUP:
-				log.Debugf("Received SIGHUP. Reloading configuration")
-			}
-		}
-	}()
-}
-
 // initiateHooksExecutor
 func (this *Migrator) initiateHooksExecutor() (err error) {
 	this.hooksExecutor = NewHooksExecutor()
@@ -932,7 +915,7 @@ func (this *Migrator) printStatus(rule PrintStatusRule, writers ...io.Writer) {
 	}
 }
 
-// initiateStreaming begins treaming of binary log events and registers listeners for such events
+// initiateStreaming begins streaming of binary log events and registers listeners for such events
 func (this *Migrator) initiateStreaming() error {
 	this.eventsStreamer = NewEventsStreamer()
 	if err := this.eventsStreamer.InitDBConnections(); err != nil {

go/logic/streamer.go

@@ -107,7 +107,7 @@ func (this *EventsStreamer) InitDBConnections() (err error) {
 	if this.db, _, err = sqlutils.GetDB(EventsStreamerUri); err != nil {
 		return err
 	}
-	if err := this.validateConnection(); err != nil {
+	if _, err := base.ValidateConnection(this.db, this.connectionConfig); err != nil {
 		return err
 	}
 	if err := this.readCurrentBinlogCoordinates(); err != nil {
@@ -133,20 +133,6 @@ func (this *EventsStreamer) initBinlogReader(binlogCoordinates *mysql.BinlogCoor
 	return nil
 }
 
-// validateConnection issues a simple can-connect to MySQL
-func (this *EventsStreamer) validateConnection() error {
-	query := `select @@global.port`
-	var port int
-	if err := this.db.QueryRow(query).Scan(&port); err != nil {
-		return err
-	}
-	if port != this.connectionConfig.Key.Port {
-		return fmt.Errorf("Unexpected database port reported: %+v", port)
-	}
-	log.Infof("connection validated on %+v", this.connectionConfig.Key)
-	return nil
-}
-
 func (this *EventsStreamer) GetCurrentBinlogCoordinates() *mysql.BinlogCoordinates {
 	return this.binlogReader.GetCurrentBinlogCoordinates()
 }

go/mysql/connection.go

@@ -56,5 +56,5 @@ func (this *ConnectionConfig) GetDBUri(databaseName string) string {
 		// Wrap IPv6 literals in square brackets
 		hostname = fmt.Sprintf("[%s]", hostname)
 	}
-	return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4,utf8,latin1", this.User, this.Password, hostname, this.Key.Port, databaseName)
+	return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?interpolateParams=true&autocommit=true&charset=utf8mb4,utf8,latin1", this.User, this.Password, hostname, this.Key.Port, databaseName)
 }

go/mysql/utils.go

@@ -17,6 +17,7 @@ import (
 )
 
 const MaxTableNameLength = 64
+const MaxReplicationPasswordLength = 32
 
 type ReplicationLagResult struct {
 	Key InstanceKey

go/sql/builder.go

@@ -38,6 +38,8 @@ func buildColumnsPreparedValues(columns *ColumnList) []string {
 		var token string
 		if column.timezoneConversion != nil {
 			token = fmt.Sprintf("convert_tz(?, '%s', '%s')", column.timezoneConversion.ToTimezone, "+00:00")
+		} else if column.Type == JSONColumnType {
+			token = "convert(? using utf8mb4)"
 		} else {
 			token = "?"
 		}
@@ -106,6 +108,8 @@ func BuildSetPreparedClause(columns *ColumnList) (result string, err error) {
 		var setToken string
 		if column.timezoneConversion != nil {
 			setToken = fmt.Sprintf("%s=convert_tz(?, '%s', '%s')", EscapeName(column.Name), column.timezoneConversion.ToTimezone, "+00:00")
+		} else if column.Type == JSONColumnType {
+			setToken = fmt.Sprintf("%s=convert(? using utf8mb4)", EscapeName(column.Name))
 		} else {
 			setToken = fmt.Sprintf("%s=?", EscapeName(column.Name))
 		}
@@ -231,7 +235,62 @@ func BuildRangeInsertPreparedQuery(databaseName, originalTableName, ghostTableNa
 	return BuildRangeInsertQuery(databaseName, originalTableName, ghostTableName, sharedColumns, mappedSharedColumns, uniqueKey, uniqueKeyColumns, rangeStartValues, rangeEndValues, rangeStartArgs, rangeEndArgs, includeRangeStartValues, transactionalTable)
 }
 
-func BuildUniqueKeyRangeEndPreparedQuery(databaseName, tableName string, uniqueKeyColumns *ColumnList, rangeStartArgs, rangeEndArgs []interface{}, chunkSize int64, includeRangeStartValues bool, hint string) (result string, explodedArgs []interface{}, err error) {
+func BuildUniqueKeyRangeEndPreparedQueryViaOffset(databaseName, tableName string, uniqueKeyColumns *ColumnList, rangeStartArgs, rangeEndArgs []interface{}, chunkSize int64, includeRangeStartValues bool, hint string) (result string, explodedArgs []interface{}, err error) {
+	if uniqueKeyColumns.Len() == 0 {
+		return "", explodedArgs, fmt.Errorf("Got 0 columns in BuildUniqueKeyRangeEndPreparedQuery")
+	}
+	databaseName = EscapeName(databaseName)
+	tableName = EscapeName(tableName)
+
+	var startRangeComparisonSign ValueComparisonSign = GreaterThanComparisonSign
+	if includeRangeStartValues {
+		startRangeComparisonSign = GreaterThanOrEqualsComparisonSign
+	}
+	rangeStartComparison, rangeExplodedArgs, err := BuildRangePreparedComparison(uniqueKeyColumns, rangeStartArgs, startRangeComparisonSign)
+	if err != nil {
+		return "", explodedArgs, err
+	}
+	explodedArgs = append(explodedArgs, rangeExplodedArgs...)
+	rangeEndComparison, rangeExplodedArgs, err := BuildRangePreparedComparison(uniqueKeyColumns, rangeEndArgs, LessThanOrEqualsComparisonSign)
+	if err != nil {
+		return "", explodedArgs, err
+	}
+	explodedArgs = append(explodedArgs, rangeExplodedArgs...)
+
+	uniqueKeyColumnNames := duplicateNames(uniqueKeyColumns.Names())
+	uniqueKeyColumnAscending := make([]string, len(uniqueKeyColumnNames), len(uniqueKeyColumnNames))
+	uniqueKeyColumnDescending := make([]string, len(uniqueKeyColumnNames), len(uniqueKeyColumnNames))
+	for i, column := range uniqueKeyColumns.Columns() {
+		uniqueKeyColumnNames[i] = EscapeName(uniqueKeyColumnNames[i])
+		if column.Type == EnumColumnType {
+			uniqueKeyColumnAscending[i] = fmt.Sprintf("concat(%s) asc", uniqueKeyColumnNames[i])
+			uniqueKeyColumnDescending[i] = fmt.Sprintf("concat(%s) desc", uniqueKeyColumnNames[i])
+		} else {
+			uniqueKeyColumnAscending[i] = fmt.Sprintf("%s asc", uniqueKeyColumnNames[i])
+			uniqueKeyColumnDescending[i] = fmt.Sprintf("%s desc", uniqueKeyColumnNames[i])
+		}
+	}
+	result = fmt.Sprintf(`
+				select  /* gh-ost %s.%s %s */
+						%s
+					from
+						%s.%s
+					where %s and %s
+					order by
+						%s
+					limit 1
+					offset %d
+    `, databaseName, tableName, hint,
+		strings.Join(uniqueKeyColumnNames, ", "),
+		databaseName, tableName,
+		rangeStartComparison, rangeEndComparison,
+		strings.Join(uniqueKeyColumnAscending, ", "),
+		(chunkSize - 1),
+	)
+	return result, explodedArgs, nil
+}
+
+func BuildUniqueKeyRangeEndPreparedQueryViaTemptable(databaseName, tableName string, uniqueKeyColumns *ColumnList, rangeStartArgs, rangeEndArgs []interface{}, chunkSize int64, includeRangeStartValues bool, hint string) (result string, explodedArgs []interface{}, err error) {
 	if uniqueKeyColumns.Len() == 0 {
 		return "", explodedArgs, fmt.Errorf("Got 0 columns in BuildUniqueKeyRangeEndPreparedQuery")
 	}

go/sql/builder_test.go

@@ -283,7 +283,7 @@ func TestBuildUniqueKeyRangeEndPreparedQuery(t *testing.T) {
 		rangeStartArgs := []interface{}{3, 17}
 		rangeEndArgs := []interface{}{103, 117}
 
-		query, explodedArgs, err := BuildUniqueKeyRangeEndPreparedQuery(databaseName, originalTableName, uniqueKeyColumns, rangeStartArgs, rangeEndArgs, chunkSize, false, "test")
+		query, explodedArgs, err := BuildUniqueKeyRangeEndPreparedQueryViaTemptable(databaseName, originalTableName, uniqueKeyColumns, rangeStartArgs, rangeEndArgs, chunkSize, false, "test")
 		test.S(t).ExpectNil(err)
 		expected := `
 				select /* gh-ost mydb.tbl test */ name, position

go/sql/types.go

@@ -20,6 +20,8 @@ const (
 	DateTimeColumnType             = iota
 	EnumColumnType                 = iota
 	MediumIntColumnType            = iota
+	JSONColumnType                 = iota
+	FloatColumnType                = iota
 )
 
 const maxMediumintUnsigned int32 = 16777215

localtests/datetime-submillis-zeroleading/create.sql

@@ -0,0 +1,27 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  i int not null,
+  dt0 datetime(6),
+  dt1 datetime(6),
+  ts2 timestamp(6),
+  updated tinyint unsigned default 0,
+  primary key(id),
+  key i_idx(i)
+) auto_increment=1;
+
+drop event if exists gh_ost_test;
+delimiter ;;
+create event gh_ost_test
+  on schedule every 1 second
+  starts current_timestamp
+  ends current_timestamp + interval 60 second
+  on completion not preserve
+  enable
+  do
+begin
+  insert into gh_ost_test values (null, 11, '2016-10-31 11:22:33.0123', now(), '2016-10-31 11:22:33.0369', 0);
+  update gh_ost_test set dt1='2016-10-31 11:22:33.0246', updated = 1 where i = 11 order by id desc limit 1;
+
+  insert into gh_ost_test values (null, 13, '2016-10-31 11:22:33.0123', '2016-10-31 11:22:33.789', '2016-10-31 11:22:33.0369', 0);
+end ;;

localtests/datetime-to-timestamp-pk-fail/create.sql

@@ -3,9 +3,9 @@ create table gh_ost_test (
   id int unsigned auto_increment,
   i int not null,
   ts0 timestamp default current_timestamp,
-  ts1 timestamp,
+  ts1 timestamp null,
   dt2 datetime,
-  t   datetime,
+  t   datetime default current_timestamp,
   updated tinyint unsigned default 0,
   primary key(id, t),
   key i_idx(i)

localtests/datetime-to-timestamp-pk-fail/extra_args

@@ -1 +1 @@
---alter="change column t t timestamp not null"
+--alter="change column t t timestamp default current_timestamp"

localtests/datetime-to-timestamp/create.sql

@@ -3,9 +3,9 @@ create table gh_ost_test (
   id int unsigned auto_increment,
   i int not null,
   ts0 timestamp default current_timestamp,
-  ts1 timestamp,
+  ts1 timestamp null,
   dt2 datetime,
-  t   datetime,
+  t   datetime null,
   updated tinyint unsigned default 0,
   primary key(id),
   key i_idx(i)

localtests/datetime-to-timestamp/extra_args

@@ -1 +1 @@
---alter="change column t t timestamp not null"
+--alter="change column t t timestamp null"

localtests/enum-pk/create.sql

@@ -2,7 +2,7 @@ drop table if exists gh_ost_test;
 create table gh_ost_test (
   id int auto_increment,
   i int not null,
-  e enum('red', 'green', 'blue', 'orange') null default null collate 'utf8_bin',
+  e enum('red', 'green', 'blue', 'orange') not null default 'red' collate 'utf8_bin',
   primary key(id, e)
 ) auto_increment=1;
 

localtests/fail-float-unique-key/create.sql

@@ -0,0 +1,11 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  f float,
+  i int not null,
+  ts timestamp default current_timestamp,
+  dt datetime,
+  key i_idx(i),
+  unique key f_uidx(f)
+) auto_increment=1;
+
+drop event if exists gh_ost_test;

localtests/fail-float-unique-key/expect_failure

@@ -0,0 +1 @@
+No shared unique key can be found

localtests/fail-no-unique-key/extra_args

@@ -0,0 +1 @@
+--alter="add column v varchar(32)"

localtests/fail-password-length/create.sql

@@ -0,0 +1,7 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  i int not null,
+  ts timestamp,
+  primary key(id)
+) auto_increment=1;

localtests/fail-password-length/expect_failure

@@ -0,0 +1 @@
+MySQL replication length limited to 32 characters

localtests/fail-password-length/extra_args

@@ -0,0 +1 @@
+--password="0123456789abcdefghij0123456789abcdefghijxx"

localtests/json57/create.sql

@@ -0,0 +1,21 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  j json,
+  primary key(id)
+) auto_increment=1;
+
+drop event if exists gh_ost_test;
+delimiter ;;
+create event gh_ost_test
+  on schedule every 1 second
+  starts current_timestamp
+  ends current_timestamp + interval 60 second
+  on completion not preserve
+  enable
+  do
+begin
+  insert into gh_ost_test values (null, '"sometext"');
+  insert into gh_ost_test values (null, '{"key":"val"}');
+  insert into gh_ost_test values (null, '{"is-it": true, "count": 3, "elements": []}');
+end ;;

localtests/json57dml/create.sql

@@ -0,0 +1,27 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  i int not null,
+  updated tinyint not null default 0,
+  j json,
+  primary key(id)
+) auto_increment=1;
+
+drop event if exists gh_ost_test;
+delimiter ;;
+create event gh_ost_test
+  on schedule every 1 second
+  starts current_timestamp
+  ends current_timestamp + interval 60 second
+  on completion not preserve
+  enable
+  do
+begin
+  insert into gh_ost_test (id, i, j) values (null, 11, '"sometext"');
+  insert into gh_ost_test (id, i, j) values (null, 13, '{"key":"val"}');
+  insert into gh_ost_test (id, i, j) values (null, 17, '{"is-it": true, "count": 3, "elements": []}');
+
+  update gh_ost_test set j = '{"updated": 11}', updated = 1 where i = 11 and updated = 0;
+  update gh_ost_test set j = json_set(j, '$.count', 13, '$.id', id), updated = 1 where i = 13 and updated = 0;
+  delete from gh_ost_test where i = 17;
+end ;;

localtests/test.sh

@@ -29,6 +29,10 @@ verify_master_and_replica() {
     echo "Cannot verify gh-ost-test-mysql-replica"
     exit 1
   fi
+  if [ "$(gh-ost-test-mysql-replica -e "select @@global.binlog_format" -ss)" != "ROW" ] ; then
+    echo "Expecting test replica to have binlog_format=ROW"
+    exit 1
+  fi
   read replica_host replica_port <<< $(gh-ost-test-mysql-replica -e "select @@hostname, @@port" -ss)
 }
 
@@ -42,6 +46,21 @@ echo_dot() {
   echo -n "."
 }
 
+start_replication() {
+  gh-ost-test-mysql-replica -e "stop slave; start slave;"
+  num_attempts=0
+  while gh-ost-test-mysql-replica -e "show slave status\G" | grep Seconds_Behind_Master | grep -q NULL ; do
+    ((num_attempts=num_attempts+1))
+    if [ $num_attempts -gt 10 ] ; then
+      echo
+      echo "ERROR replication failure"
+      exit 1
+    fi
+    echo_dot
+    sleep 1
+  done
+}
+
 test_single() {
   local test_name
   test_name="$1"
@@ -49,7 +68,7 @@ test_single() {
   echo -n "Testing: $test_name"
 
   echo_dot
-  gh-ost-test-mysql-replica -e "stop slave; start slave; do sleep(1)"
+  start_replication
   echo_dot
   gh-ost-test-mysql-master --default-character-set=utf8mb4 test < $tests_path/$test_name/create.sql
 
@@ -82,7 +101,7 @@ test_single() {
     --table=gh_ost_test \
     --alter='engine=innodb' \
     --exact-rowcount \
-    --switch-to-rbr \
+    --assume-rbr \
     --initially-drop-old-table \
     --initially-drop-ghost-table \
     --throttle-query='select timestampdiff(second, min(last_update), now()) < 5 from _gh_ost_test_ghc' \
@@ -91,6 +110,7 @@ test_single() {
     --postpone-cut-over-flag-file=/tmp/gh-ost.test.postpone.flag \
     --test-on-replica \
     --default-retries=1 \
+    --chunk-size=10 \
     --verbose \
     --debug \
     --stack \

localtests/timestamp-to-datetime/create.sql

@@ -3,7 +3,7 @@ create table gh_ost_test (
   id int auto_increment,
   i int not null,
   ts0 timestamp default current_timestamp,
-  ts1 timestamp,
+  ts1 timestamp default current_timestamp,
   dt2 datetime,
   t   datetime,
   updated tinyint unsigned default 0,

localtests/timestamp/create.sql

@@ -3,8 +3,8 @@ create table gh_ost_test (
   id int auto_increment,
   i int not null,
   ts0 timestamp default current_timestamp,
-  ts1 timestamp,
-  ts2 timestamp,
+  ts1 timestamp default current_timestamp,
+  ts2 timestamp default current_timestamp,
   updated tinyint unsigned default 0,
   primary key(id),
   key i_idx(i)

localtests/tz-datetime-ts/create.sql

@@ -3,7 +3,7 @@ create table gh_ost_test (
   id int auto_increment,
   i int not null,
   ts0 timestamp default current_timestamp,
-  ts1 timestamp,
+  ts1 timestamp default current_timestamp,
   dt2 datetime,
   t   datetime,
   updated tinyint unsigned default 0,

localtests/tz-datetime-ts/extra_args

@@ -1 +1 @@
---alter="change column t t timestamp not null"
+--alter="change column t t timestamp not null default current_timestamp"

localtests/tz/create.sql

@@ -3,8 +3,8 @@ create table gh_ost_test (
   id int auto_increment,
   i int not null,
   ts0 timestamp default current_timestamp,
-  ts1 timestamp,
-  ts2 timestamp,
+  ts1 timestamp default current_timestamp,
+  ts2 timestamp default current_timestamp,
   updated tinyint unsigned default 0,
   primary key(id),
   key i_idx(i)

vendor/github.com/siddontang/go-mysql/replication/row_event.go

@@ -666,7 +666,7 @@ func decodeDatetime2(data []byte, dec uint16) (interface{}, int, error) {
 	hour := int((hms >> 12))
 
 	if secPart != 0 {
-		return fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d.%d", year, month, day, hour, minute, second, secPart), n, nil // commented by Shlomi Noach. Yes I know about `git blame`
+		return fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d.%06d", year, month, day, hour, minute, second, secPart), n, nil // commented by Shlomi Noach. Yes I know about `git blame`
 	}
 	return fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d", year, month, day, hour, minute, second), n, nil // commented by Shlomi Noach. Yes I know about `git blame`
 }