Merge branch 'master' into minor_changes

This commit is contained in:
Shlomi Noach 2018-09-17 08:58:04 +03:00 committed by GitHub
commit 97c1e72dbe
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23 changed files with 217 additions and 61 deletions

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@ -1 +1 @@
1.0.45
1.0.46

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@ -2,40 +2,72 @@
#
#
RELEASE_VERSION=$(cat RELEASE_VERSION)
RELEASE_VERSION=
buildpath=
function build {
osname=$1
osshort=$2
GOOS=$3
GOARCH=$4
if ! go version | egrep -q 'go(1[.]9|1[.]1[0-9])' ; then
echo "go version is too low. Must use 1.9 or above"
exit 1
fi
echo "Building ${osname} binary"
export GOOS
export GOARCH
go build -ldflags "$ldflags" -o $buildpath/$target go/cmd/gh-ost/main.go
if [ $? -ne 0 ]; then
echo "Build failed for ${osname}"
exit 1
fi
(cd $buildpath && tar cfz ./gh-ost-binary-${osshort}-${timestamp}.tar.gz $target)
function setuptree() {
b=$( mktemp -d $buildpath/gh-ostXXXXXX ) || return 1
mkdir -p $b/gh-ost
mkdir -p $b/gh-ost/usr/bin
echo $b
}
buildpath=/tmp/gh-ost
target=gh-ost
timestamp=$(date "+%Y%m%d%H%M%S")
ldflags="-X main.AppVersion=${RELEASE_VERSION}"
function build {
osname=$1
osshort=$2
GOOS=$3
GOARCH=$4
mkdir -p ${buildpath}
build macOS osx darwin amd64
build GNU/Linux linux linux amd64
echo "Binaries found in:"
ls -1 $buildpath/gh-ost-binary*${timestamp}.tar.gz
if ! go version | egrep -q 'go(1[.]9|1[.]1[0-9])' ; then
echo "go version is too low. Must use 1.9 or above"
exit 1
fi
echo "Building ${osname} binary"
export GOOS
export GOARCH
go build -ldflags "$ldflags" -o $buildpath/$target go/cmd/gh-ost/main.go
if [ $? -ne 0 ]; then
echo "Build failed for ${osname}"
exit 1
fi
(cd $buildpath && tar cfz ./gh-ost-binary-${osshort}-${timestamp}.tar.gz $target)
if [ "$GOOS" == "linux" ] ; then
echo "Creating Distro full packages"
builddir=$(setuptree)
cp $buildpath/$target $builddir/gh-ost/usr/bin
cd $buildpath
fpm -v "${RELEASE_VERSION}" --epoch 1 -f -s dir -n gh-ost -m shlomi-noach --description "GitHub's Online Schema Migrations for MySQL " --url "https://github.com/github/gh-ost" --vendor "GitHub" --license "Apache 2.0" -C $builddir/gh-ost --prefix=/ -t rpm .
fpm -v "${RELEASE_VERSION}" --epoch 1 -f -s dir -n gh-ost -m shlomi-noach --description "GitHub's Online Schema Migrations for MySQL " --url "https://github.com/github/gh-ost" --vendor "GitHub" --license "Apache 2.0" -C $builddir/gh-ost --prefix=/ -t deb --deb-no-default-config-files .
fi
}
main() {
if [ -z "${RELEASE_VERSION}" ] ; then
RELEASE_VERSION=$(git describe --abbrev=0 --tags | tr -d 'v')
fi
if [ -z "${RELEASE_VERSION}" ] ; then
RELEASE_VERSION=$(cat RELEASE_VERSION)
fi
buildpath=/tmp/gh-ost-release
target=gh-ost
timestamp=$(date "+%Y%m%d%H%M%S")
ldflags="-X main.AppVersion=${RELEASE_VERSION}"
mkdir -p ${buildpath}
rm -rf ${buildpath:?}/*
build macOS osx darwin amd64
build GNU/Linux linux linux amd64
echo "Binaries found in:"
ls -1 $buildpath/gh-ost-binary*${timestamp}.tar.gz
}
main "$@"

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@ -2,6 +2,10 @@
A more in-depth discussion of various `gh-ost` command line flags: implementation, implication, use cases.
### aliyun-rds
Add this flag when executing on Aliyun RDS.
### allow-master-master
See [`--assume-master-host`](#assume-master-host).
@ -103,6 +107,10 @@ While the ongoing estimated number of rows is still heuristic, it's almost exact
Without this parameter, migration is a _noop_: testing table creation and validity of migration, but not touching data.
### gcp
Add this flag when executing on a 1st generation Google Cloud Platform (GCP).
### heartbeat-interval-millis
Default 100. See [`subsecond-lag`](subsecond-lag.md) for details.

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@ -26,10 +26,6 @@ The `SUPER` privilege is required for `STOP SLAVE`, `START SLAVE` operations. Th
- Triggers are not supported. They may be supported in the future.
- MySQL 5.7 generated columns are not supported. They may be supported in the future.
- 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)
@ -43,14 +39,15 @@ The `SUPER` privilege is required for `STOP SLAVE`, `START SLAVE` operations. Th
- For example, you may not migrate `MyTable` if another table called `MYtable` exists in the same schema.
- Amazon RDS works, but has it's own [limitations](rds.md).
- Google Cloud SQL is currently not supported
- Google Cloud SQL works, `--gcp` flag required.
- Aliyun RDS works, `--aliyun-rds` flag required.
- Multisource is not supported when migrating via replica. It _should_ work (but never tested) when connecting directly to master (`--allow-on-master`)
- Master-master setup is only supported in active-passive setup. Active-active (where table is being written to on both masters concurrently) is unsupported. It may be supported in the future.
- If you have en `enum` field as part of your migration key (typically the `PRIMARY KEY`), migration performance will be degraded and potentially bad. [Read more](https://github.com/github/gh-ost/pull/277#issuecomment-254811520)
- If you have an `enum` field as part of your migration key (typically the `PRIMARY KEY`), migration performance will be degraded and potentially bad. [Read more](https://github.com/github/gh-ost/pull/277#issuecomment-254811520)
- Migrating a `FEDERATED` table is unsupported and is irrelevant to the problem `gh-ost` tackles.
- `ALTER TABLE ... RENAME TO some_other_name` is not supported (and you shouldn't use `gh-ost` for such a trivial operation).
- `ALTER TABLE ... RENAME TO some_other_name` is not supported (and you shouldn't use `gh-ost` for such a trivial operation).

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@ -92,6 +92,7 @@ type MigrationContext struct {
IsTungsten bool
DiscardForeignKeys bool
AliyunRDS bool
GoogleCloudPlatform bool
config ContextConfig
configMutex *sync.Mutex
@ -186,8 +187,10 @@ type MigrationContext struct {
OriginalTableColumnsOnApplier *sql.ColumnList
OriginalTableColumns *sql.ColumnList
OriginalTableVirtualColumns *sql.ColumnList
OriginalTableUniqueKeys [](*sql.UniqueKey)
GhostTableColumns *sql.ColumnList
GhostTableVirtualColumns *sql.ColumnList
GhostTableUniqueKeys [](*sql.UniqueKey)
UniqueKey *sql.UniqueKey
SharedColumns *sql.ColumnList

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@ -75,7 +75,8 @@ func ValidateConnection(db *gosql.DB, connectionConfig *mysql.ConnectionConfig,
// swallow this error. not all servers support extra_port
}
// AliyunRDS set users port to "NULL", replace it by gh-ost param
if migrationContext.AliyunRDS {
// GCP set users port to "NULL", replace it by gh-ost param
if migrationContext.AliyunRDS || migrationContext.GoogleCloudPlatform {
port = connectionConfig.Key.Port
} else {
portQuery := `select @@global.port`

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@ -145,7 +145,7 @@ func (this *GoMySQLReader) StreamEvents(canStopStreaming func() bool, entriesCha
defer this.currentCoordinatesMutex.Unlock()
this.currentCoordinates.LogFile = string(rotateEvent.NextLogName)
}()
log.Infof("rotate to next log name: %s", rotateEvent.NextLogName)
log.Infof("rotate to next log from %s:%d to %s", this.currentCoordinates.LogFile, int64(ev.Header.LogPos), rotateEvent.NextLogName)
} else if rowsEvent, ok := ev.Event.(*replication.RowsEvent); ok {
if err := this.handleRowsEvent(ev, rowsEvent, entriesChannel); err != nil {
return err

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@ -68,6 +68,7 @@ func main() {
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")
flag.BoolVar(&migrationContext.SkipForeignKeyChecks, "skip-foreign-key-checks", false, "set to 'true' when you know for certain there are no foreign keys on your table, and wish to skip the time it takes for gh-ost to verify that")
flag.BoolVar(&migrationContext.AliyunRDS, "aliyun-rds", false, "set to 'true' when you execute on Aliyun RDS.")
flag.BoolVar(&migrationContext.GoogleCloudPlatform, "gcp", false, "set to 'true' when you execute on a 1st generation Google Cloud Platform (GCP).")
executeFlag := flag.Bool("execute", false, "actually execute the alter & migrate the table. Default is noop: do some tests and exit")
flag.BoolVar(&migrationContext.TestOnReplica, "test-on-replica", false, "Have the migration run on a replica, not on the master. At the end of migration replication is stopped, and tables are swapped and immediately swap-revert. Replication remains stopped and you can compare the two tables for building trust")

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@ -89,7 +89,7 @@ func (this *Applier) InitDBConnections() (err error) {
if err := this.validateAndReadTimeZone(); err != nil {
return err
}
if !this.migrationContext.AliyunRDS {
if !this.migrationContext.AliyunRDS && !this.migrationContext.GoogleCloudPlatform {
if impliedKey, err := mysql.GetInstanceKey(this.db); err != nil {
return err
} else {
@ -117,7 +117,7 @@ func (this *Applier) validateAndReadTimeZone() error {
// readTableColumns reads table columns on applier
func (this *Applier) readTableColumns() (err error) {
log.Infof("Examining table structure on applier")
this.migrationContext.OriginalTableColumnsOnApplier, err = mysql.GetTableColumns(this.db, this.migrationContext.DatabaseName, this.migrationContext.OriginalTableName)
this.migrationContext.OriginalTableColumnsOnApplier, _, err = mysql.GetTableColumns(this.db, this.migrationContext.DatabaseName, this.migrationContext.OriginalTableName)
if err != nil {
return err
}

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@ -53,7 +53,7 @@ func (this *Inspector) InitDBConnections() (err error) {
if err := this.validateConnection(); err != nil {
return err
}
if !this.migrationContext.AliyunRDS {
if !this.migrationContext.AliyunRDS && !this.migrationContext.GoogleCloudPlatform {
if impliedKey, err := mysql.GetInstanceKey(this.db); err != nil {
return err
} else {
@ -89,24 +89,24 @@ func (this *Inspector) ValidateOriginalTable() (err error) {
return nil
}
func (this *Inspector) InspectTableColumnsAndUniqueKeys(tableName string) (columns *sql.ColumnList, uniqueKeys [](*sql.UniqueKey), err error) {
func (this *Inspector) InspectTableColumnsAndUniqueKeys(tableName string) (columns *sql.ColumnList, virtualColumns *sql.ColumnList, uniqueKeys [](*sql.UniqueKey), err error) {
uniqueKeys, err = this.getCandidateUniqueKeys(tableName)
if err != nil {
return columns, uniqueKeys, err
return columns, virtualColumns, uniqueKeys, err
}
if len(uniqueKeys) == 0 {
return columns, uniqueKeys, fmt.Errorf("No PRIMARY nor UNIQUE key found in table! Bailing out")
return columns, virtualColumns, uniqueKeys, fmt.Errorf("No PRIMARY nor UNIQUE key found in table! Bailing out")
}
columns, err = mysql.GetTableColumns(this.db, this.migrationContext.DatabaseName, tableName)
columns, virtualColumns, err = mysql.GetTableColumns(this.db, this.migrationContext.DatabaseName, tableName)
if err != nil {
return columns, uniqueKeys, err
return columns, virtualColumns, uniqueKeys, err
}
return columns, uniqueKeys, nil
return columns, virtualColumns, uniqueKeys, nil
}
func (this *Inspector) InspectOriginalTable() (err error) {
this.migrationContext.OriginalTableColumns, this.migrationContext.OriginalTableUniqueKeys, err = this.InspectTableColumnsAndUniqueKeys(this.migrationContext.OriginalTableName)
this.migrationContext.OriginalTableColumns, this.migrationContext.OriginalTableVirtualColumns, this.migrationContext.OriginalTableUniqueKeys, err = this.InspectTableColumnsAndUniqueKeys(this.migrationContext.OriginalTableName)
if err != nil {
return err
}
@ -122,7 +122,7 @@ func (this *Inspector) inspectOriginalAndGhostTables() (err error) {
return fmt.Errorf("It seems like table structure is not identical between master and replica. This scenario is not supported.")
}
this.migrationContext.GhostTableColumns, this.migrationContext.GhostTableUniqueKeys, err = this.InspectTableColumnsAndUniqueKeys(this.migrationContext.GetGhostTableName())
this.migrationContext.GhostTableColumns, this.migrationContext.GhostTableVirtualColumns, this.migrationContext.GhostTableUniqueKeys, err = this.InspectTableColumnsAndUniqueKeys(this.migrationContext.GetGhostTableName())
if err != nil {
return err
}
@ -166,7 +166,7 @@ func (this *Inspector) inspectOriginalAndGhostTables() (err error) {
}
}
this.migrationContext.SharedColumns, this.migrationContext.MappedSharedColumns = this.getSharedColumns(this.migrationContext.OriginalTableColumns, this.migrationContext.GhostTableColumns, this.migrationContext.ColumnRenameMap)
this.migrationContext.SharedColumns, this.migrationContext.MappedSharedColumns = this.getSharedColumns(this.migrationContext.OriginalTableColumns, this.migrationContext.GhostTableColumns, this.migrationContext.OriginalTableVirtualColumns, this.migrationContext.GhostTableVirtualColumns, this.migrationContext.ColumnRenameMap)
log.Infof("Shared columns are %s", this.migrationContext.SharedColumns)
// By fact that a non-empty unique key exists we also know the shared columns are non-empty
@ -692,7 +692,7 @@ func (this *Inspector) getSharedUniqueKeys(originalUniqueKeys, ghostUniqueKeys [
}
// getSharedColumns returns the intersection of two lists of columns in same order as the first list
func (this *Inspector) getSharedColumns(originalColumns, ghostColumns *sql.ColumnList, columnRenameMap map[string]string) (*sql.ColumnList, *sql.ColumnList) {
func (this *Inspector) getSharedColumns(originalColumns, ghostColumns *sql.ColumnList, originalVirtualColumns, ghostVirtualColumns *sql.ColumnList, columnRenameMap map[string]string) (*sql.ColumnList, *sql.ColumnList) {
sharedColumnNames := []string{}
for _, originalColumn := range originalColumns.Names() {
isSharedColumn := false
@ -712,6 +712,16 @@ func (this *Inspector) getSharedColumns(originalColumns, ghostColumns *sql.Colum
break
}
}
for _, virtualColumn := range originalVirtualColumns.Names() {
if strings.EqualFold(originalColumn, virtualColumn) {
isSharedColumn = false
}
}
for _, virtualColumn := range ghostVirtualColumns.Names() {
if strings.EqualFold(originalColumn, virtualColumn) {
isSharedColumn = false
}
}
if isSharedColumn {
sharedColumnNames = append(sharedColumnNames, originalColumn)
}

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@ -8,6 +8,7 @@ package mysql
import (
gosql "database/sql"
"fmt"
"strings"
"sync"
"time"
@ -173,7 +174,7 @@ func GetInstanceKey(db *gosql.DB) (instanceKey *InstanceKey, err error) {
}
// GetTableColumns reads column list from given table
func GetTableColumns(db *gosql.DB, databaseName, tableName string) (*sql.ColumnList, error) {
func GetTableColumns(db *gosql.DB, databaseName, tableName string) (*sql.ColumnList, *sql.ColumnList, error) {
query := fmt.Sprintf(`
show columns from %s.%s
`,
@ -181,18 +182,24 @@ func GetTableColumns(db *gosql.DB, databaseName, tableName string) (*sql.ColumnL
sql.EscapeName(tableName),
)
columnNames := []string{}
virtualColumnNames := []string{}
err := sqlutils.QueryRowsMap(db, query, func(rowMap sqlutils.RowMap) error {
columnNames = append(columnNames, rowMap.GetString("Field"))
columnName := rowMap.GetString("Field")
columnNames = append(columnNames, columnName)
if strings.Contains(rowMap.GetString("Extra"), " GENERATED") {
log.Debugf("%s is a generated column", columnName)
virtualColumnNames = append(virtualColumnNames, columnName)
}
return nil
})
if err != nil {
return nil, err
return nil, nil, err
}
if len(columnNames) == 0 {
return nil, log.Errorf("Found 0 columns on %s.%s. Bailing out",
return nil, nil, log.Errorf("Found 0 columns on %s.%s. Bailing out",
sql.EscapeName(databaseName),
sql.EscapeName(tableName),
)
}
return sql.NewColumnList(columnNames), nil
return sql.NewColumnList(columnNames), sql.NewColumnList(virtualColumnNames), nil
}

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@ -0,0 +1,29 @@
drop table if exists gh_ost_test;
create table gh_ost_test (
id int auto_increment,
a int not null,
b int not null,
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, a, b) values (null, 2,3);
insert into gh_ost_test (id, a, b) values (null, 2,4);
insert into gh_ost_test (id, a, b) values (null, 2,5);
insert into gh_ost_test (id, a, b) values (null, 2,6);
insert into gh_ost_test (id, a, b) values (null, 2,7);
insert into gh_ost_test (id, a, b) values (null, 2,8);
insert into gh_ost_test (id, a, b) values (null, 2,9);
insert into gh_ost_test (id, a, b) values (null, 2,0);
insert into gh_ost_test (id, a, b) values (null, 2,1);
insert into gh_ost_test (id, a, b) values (null, 2,2);
end ;;

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@ -0,0 +1 @@
--alter="add column sum_ab int as (a + b) virtual not null"

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@ -0,0 +1 @@
id, a, b

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@ -0,0 +1 @@
(5.5|5.6)

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@ -0,0 +1 @@
id

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@ -0,0 +1 @@
id, a, b

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@ -0,0 +1,30 @@
drop table if exists gh_ost_test;
create table gh_ost_test (
id int auto_increment,
a int not null,
b int not null,
sum_ab int as (a + b) virtual not null,
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, a, b) values (null, 2,3);
insert into gh_ost_test (id, a, b) values (null, 2,4);
insert into gh_ost_test (id, a, b) values (null, 2,5);
insert into gh_ost_test (id, a, b) values (null, 2,6);
insert into gh_ost_test (id, a, b) values (null, 2,7);
insert into gh_ost_test (id, a, b) values (null, 2,8);
insert into gh_ost_test (id, a, b) values (null, 2,9);
insert into gh_ost_test (id, a, b) values (null, 2,0);
insert into gh_ost_test (id, a, b) values (null, 2,1);
insert into gh_ost_test (id, a, b) values (null, 2,2);
end ;;

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@ -0,0 +1 @@
--alter="change sum_ab total_ab int as (a + b) virtual not null" --approve-renamed-columns

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@ -0,0 +1 @@
(5.5|5.6)

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@ -0,0 +1,30 @@
drop table if exists gh_ost_test;
create table gh_ost_test (
id int auto_increment,
a int not null,
b int not null,
sum_ab int as (a + b) virtual not null,
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, a, b) values (null, 2,3);
insert into gh_ost_test (id, a, b) values (null, 2,4);
insert into gh_ost_test (id, a, b) values (null, 2,5);
insert into gh_ost_test (id, a, b) values (null, 2,6);
insert into gh_ost_test (id, a, b) values (null, 2,7);
insert into gh_ost_test (id, a, b) values (null, 2,8);
insert into gh_ost_test (id, a, b) values (null, 2,9);
insert into gh_ost_test (id, a, b) values (null, 2,0);
insert into gh_ost_test (id, a, b) values (null, 2,1);
insert into gh_ost_test (id, a, b) values (null, 2,2);
end ;;

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@ -0,0 +1 @@
(5.5|5.6)

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@ -19,7 +19,7 @@ create event gh_ost_test
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": []}');
insert into gh_ost_test (id, i, j) values (null, 17, '{"is-it": true, "count": 3, "elements": []}');
insert into gh_ost_test (id, i, j) values (null, 19, '{"text":"Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet. Quisque rutrum. Aenean imperdiet. Etiam ultricies nisi vel augue. Curabitur ullamcorper ultricies nisi. Nam eget dui. Etiam rhoncus. Maecenas tempus, tellus eget condimentum rhoncus, sem quam semper libero, sit amet adipiscing sem neque sed ipsum. Nam quam nunc, blandit vel, luctus pulvinar, hendrerit id, lorem. Maecenas nec odio et ante tincidunt tempus. Donec vitae sapien ut libero venenatis faucibus. Nullam quis ante. Etiam sit amet orci eget eros faucibus tincidunt. Duis leo. Sed fringilla mauris sit amet nibh. Donec sodales sagittis magna. Sed consequat, leo eget bibendum sodales, augue velit cursus nunc, quis gravida magna mi a libero. Fusce vulputate eleifend sapien. Vestibulum purus quam, scelerisque ut, mollis sed, nonummy id, metus. Nullam accumsan lorem in dui. Cras ultricies mi eu turpis hendrerit fringilla. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; In ac dui quis mi consectetuer lacinia. Nam pretium turpis et arcu. Duis arcu tortor, suscipit eget, imperdiet nec, imperdiet iaculis, ipsum. Sed aliquam ultrices mauris. Integer ante arcu, accumsan a, consectetuer eget, posuere ut, mauris. Praesent adipiscing. Phasellus ullamcorper ipsum rutrum nunc. Nunc nonummy metus. Vestibulum volutpat pretium libero. Cras id dui. Aenean ut eros et nisl sagittis vestibulum. Nullam nulla eros, ultricies sit amet, nonummy id, imperdiet feugiat, pede. Sed lectus. Donec mollis hendrerit risus. Phasellus nec sem in justo pellentesque facilisis. Etiam imperdiet imperdiet orci. Nunc nec neque. Phasellus leo dolor, tempus non, auctor et, hendrerit quis, nisi. Curabitur ligula sapien, tincidunt non, euismod vitae, posuere imperdiet, leo. Maecenas malesuada. Praesent congue erat at massa. Sed cursus turpis vitae tortor. Donec posuere vulputate arcu. Phasellus accumsan cursus velit. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Sed aliquam, nisi quis porttitor congue, elit erat euismod orci, ac"}');
update gh_ost_test set j = '{"updated": 11}', updated = 1 where i = 11 and updated = 0;