Merge branch 'slack-19.0' into no-vexplain-downgrade-ci_slack-19.0

slackhq · Oct 16, 2024 · 46c78d9 · 46c78d9
2 parents 88ae6ea + 987e2a6
commit 46c78d9
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Showing 2 changed files with 24 additions and 4 deletions.
diff --git a/go/flags/endtoend/vttablet.txt b/go/flags/endtoend/vttablet.txt
@@ -402,6 +402,7 @@ Flags:
       --tx_throttler_config string                                       The configuration of the transaction throttler as a text-formatted throttlerdata.Configuration protocol buffer message. (default "target_replication_lag_sec:2 max_replication_lag_sec:10 initial_rate:100 max_increase:1 emergency_decrease:0.5 min_duration_between_increases_sec:40 max_duration_between_increases_sec:62 min_duration_between_decreases_sec:20 spread_backlog_across_sec:20 age_bad_rate_after_sec:180 bad_rate_increase:0.1 max_rate_approach_threshold:0.9")
       --tx_throttler_healthcheck_cells strings                           A comma-separated list of cells. Only tabletservers running in these cells will be monitored for replication lag by the transaction throttler.
       --unhealthy_threshold duration                                     replication lag after which a replica is considered unhealthy (default 2h0m0s)
+      --use_super_read_only                                              Set super_read_only flag when performing planned failover.
       --v Level                                                          log level for V logs
   -v, --version                                                          print binary version
       --vmodule vModuleFlag                                              comma-separated list of pattern=N settings for file-filtered logging

diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -22,6 +22,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/spf13/pflag"
+
 	"vitess.io/vitess/go/mysql/replication"
 	"vitess.io/vitess/go/mysql/sqlerror"
 	"vitess.io/vitess/go/protoutil"
@@ -30,13 +32,24 @@ import (
 	"vitess.io/vitess/go/vt/log"
 	"vitess.io/vitess/go/vt/mysqlctl"
 	"vitess.io/vitess/go/vt/proto/vtrpc"
+	"vitess.io/vitess/go/vt/servenv"
 	"vitess.io/vitess/go/vt/topo/topoproto"
 	"vitess.io/vitess/go/vt/vterrors"
 
 	replicationdatapb "vitess.io/vitess/go/vt/proto/replicationdata"
 	topodatapb "vitess.io/vitess/go/vt/proto/topodata"
 )
 
+var setSuperReadOnly bool
+
+func registerReplicationFlags(fs *pflag.FlagSet) {
+	fs.BoolVar(&setSuperReadOnly, "use_super_read_only", setSuperReadOnly, "Set super_read_only flag when performing planned failover.")
+}
+
+func init() {
+	servenv.OnParseFor("vttablet", registerReplicationFlags)
+}
+
 // ReplicationStatus returns the replication status
 func (tm *TabletManager) ReplicationStatus(ctx context.Context) (*replicationdatapb.Status, error) {
 	if err := tm.waitForGrantsToHaveApplied(ctx); err != nil {
@@ -528,10 +541,16 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 	// set MySQL to super_read_only mode. If we are already super_read_only because of a
 	// previous demotion, or because we are not primary anyway, this should be
 	// idempotent.
-	if _, err := tm.MysqlDaemon.SetSuperReadOnly(true); err != nil {
-		if sqlErr, ok := err.(*sqlerror.SQLError); ok && sqlErr.Number() == sqlerror.ERUnknownSystemVariable {
-			log.Warningf("server does not know about super_read_only, continuing anyway...")
-		} else {
+	if setSuperReadOnly {
+		if _, err := tm.MysqlDaemon.SetSuperReadOnly(true); err != nil {
+			if sqlErr, ok := err.(*sqlerror.SQLError); ok && sqlErr.Number() == sqlerror.ERUnknownSystemVariable {
+				log.Warningf("server does not know about super_read_only, continuing anyway...")
+			} else {
+				return nil, err
+			}
+		}
+	} else {
+		if err := tm.MysqlDaemon.SetReadOnly(true); err != nil {
 			return nil, err
 		}
 	}