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feat(): feat-set-binlogsyncer-maxreconnectattempts #1279

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May 25, 2023
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feat(): feat-set-binlogsyncer-maxreconnectattempts #1279

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3 changes: 3 additions & 0 deletions doc/command-line-flags.md
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Expand Up @@ -61,6 +61,9 @@ It is not reliable to parse the `ALTER` statement to determine if it is instant

`gh-ost` will automatically fallback to the normal DDL process if the attempt to use instant DDL is unsuccessful.

### binlogsyncer-max-reconnect-attempts
`--binlogsyncer-max-reconnect-attempts=0`, the maximum number of attempts to re-establish a broken inspector connection for sync binlog. `0` or `negative number` means infinite retry, default `0`

### conf

`--conf=/path/to/my.cnf`: file where credentials are specified. Should be in (or contain) the following format:
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2 changes: 2 additions & 0 deletions go/base/context.go
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Expand Up @@ -232,6 +232,8 @@ type MigrationContext struct {

recentBinlogCoordinates mysql.BinlogCoordinates

BinlogSyncerMaxReconnectAttempts int

Log Logger
}

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17 changes: 9 additions & 8 deletions go/binlog/gomysql_reader.go
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Expand Up @@ -36,14 +36,15 @@ func NewGoMySQLReader(migrationContext *base.MigrationContext) *GoMySQLReader {
currentCoordinates: mysql.BinlogCoordinates{},
currentCoordinatesMutex: &sync.Mutex{},
binlogSyncer: replication.NewBinlogSyncer(replication.BinlogSyncerConfig{
ServerID: uint32(migrationContext.ReplicaServerId),
Flavor: gomysql.MySQLFlavor,
Host: connectionConfig.Key.Hostname,
Port: uint16(connectionConfig.Key.Port),
User: connectionConfig.User,
Password: connectionConfig.Password,
TLSConfig: connectionConfig.TLSConfig(),
UseDecimal: true,
ServerID: uint32(migrationContext.ReplicaServerId),
Flavor: gomysql.MySQLFlavor,
Host: connectionConfig.Key.Hostname,
Port: uint16(connectionConfig.Key.Port),
User: connectionConfig.User,
Password: connectionConfig.Password,
TLSConfig: connectionConfig.TLSConfig(),
UseDecimal: true,
MaxReconnectAttempts: migrationContext.BinlogSyncerMaxReconnectAttempts,
}),
}
}
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1 change: 1 addition & 0 deletions go/cmd/gh-ost/main.go
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Expand Up @@ -134,6 +134,7 @@ func main() {
flag.Int64Var(&migrationContext.HooksStatusIntervalSec, "hooks-status-interval", 60, "how many seconds to wait between calling onStatus hook")

flag.UintVar(&migrationContext.ReplicaServerId, "replica-server-id", 99999, "server id used by gh-ost process. Default: 99999")
flag.IntVar(&migrationContext.BinlogSyncerMaxReconnectAttempts, "binlogsyncer-max-reconnect-attempts", 0, "when master node fails, the maximum number of binlog synchronization attempts to reconnect. 0 is unlimited")

maxLoad := flag.String("max-load", "", "Comma delimited status-name=threshold. e.g: 'Threads_running=100,Threads_connected=500'. When status exceeds threshold, app throttles writes")
criticalLoad := flag.String("critical-load", "", "Comma delimited status-name=threshold, same format as --max-load. When status exceeds threshold, app panics and quits")
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