rename warming reads pool to channel, use concurrency for flag name

Signed-off-by: Olga Shestopalova <oshestopalova@hubspot.com>

go/flags/endtoend/vtcombo.txt

@@ -421,8 +421,8 @@ Flags:
       --vtgate_grpc_server_name string                                   the server name to use to validate server certificate
       --vttablet_skip_buildinfo_tags string                              comma-separated list of buildinfo tags to skip from merging with --init_tags. each tag is either an exact match or a regular expression of the form '/regexp/'. (default "/.*/")
       --wait_for_backup_interval duration                                (init restore parameter) if this is greater than 0, instead of starting up empty when no backups are found, keep checking at this interval for a backup to appear
+      --warming-reads-concurrency int                                    Number of concurrent warming reads allowed (default 500)
       --warming-reads-percent int                                        Percentage of reads on the primary to forward to replicas. Useful for keeping buffer pools warm (default 0)
-      --warming-reads-pool-size int                                      Size of goroutine pool for warming reads (default 500)
       --warming-reads-query-timeout duration                             Timeout of warming read queries (default 5s)
       --warn_memory_rows int                                             Warning threshold for in-memory results. A row count higher than this amount will cause the VtGateWarnings.ResultsExceeded counter to be incremented. (default 30000)
       --warn_payload_size int                                            The warning threshold for query payloads in bytes. A payload greater than this threshold will cause the VtGateWarnings.WarnPayloadSizeExceeded counter to be incremented.

go/flags/endtoend/vtgate.txt

@@ -229,8 +229,8 @@ Flags:
       --vmodule moduleSpec                                               comma-separated list of pattern=N settings for file-filtered logging
       --vschema_ddl_authorized_users string                              List of users authorized to execute vschema ddl operations, or '%' to allow all users.
       --vtgate-config-terse-errors                                       prevent bind vars from escaping in returned errors
+      --warming-reads-concurrency int                                    Number of concurrent warming reads allowed (default 500)
       --warming-reads-percent int                                        Percentage of reads on the primary to forward to replicas. Useful for keeping buffer pools warm (default 0)
-      --warming-reads-pool-size int                                      Size of goroutine pool for warming reads (default 500)
       --warming-reads-query-timeout duration                             Timeout of warming read queries (default 5s)
       --warn_memory_rows int                                             Warning threshold for in-memory results. A row count higher than this amount will cause the VtGateWarnings.ResultsExceeded counter to be incremented. (default 30000)
       --warn_payload_size int                                            The warning threshold for query payloads in bytes. A payload greater than this threshold will cause the VtGateWarnings.WarnPayloadSizeExceeded counter to be incremented.

go/vt/vtgate/engine/fake_vcursor_test.go

@@ -93,7 +93,7 @@ func (t *noopVCursor) GetWarmingReadsPercent() int {
 	panic("implement me")
 }
 
-func (t *noopVCursor) GetWarmingReadsPool() chan bool {
+func (t *noopVCursor) GetWarmingReadsChannel() chan bool {
 	panic("implement me")
 }
 
@@ -497,7 +497,7 @@ func (f *loggingVCursor) GetWarmingReadsPercent() int {
 	return 0
 }
 
-func (f *loggingVCursor) GetWarmingReadsPool() chan bool {
+func (f *loggingVCursor) GetWarmingReadsChannel() chan bool {
 	return make(chan bool)
 }
 

go/vt/vtgate/engine/primitive.go

@@ -123,8 +123,8 @@ type (
 		// GetWarmingReadsPercent gets the percentage of queries to clone to replicas for bufferpool warming
 		GetWarmingReadsPercent() int
 
-		// GetWarmingReadsPool returns the pool for executing warming reads against replicas
-		GetWarmingReadsPool() chan bool
+		// GetWarmingReadsChannel returns the channel for executing warming reads against replicas
+		GetWarmingReadsChannel() chan bool
 
 		// CloneForReplicaWarming clones the VCursor for re-use in warming queries to replicas
 		CloneForReplicaWarming(ctx context.Context) VCursor

go/vt/vtgate/engine/route.go

@@ -606,7 +606,7 @@ func (route *Route) executeWarmingReplicaRead(ctx context.Context, vcursor VCurs
 	}
 
 	replicaVCursor := vcursor.CloneForReplicaWarming(ctx)
-	pool := vcursor.GetWarmingReadsPool()
+	pool := vcursor.GetWarmingReadsChannel()
 
 	select {
 	// if there's no more room in the pool, drop the warming read

go/vt/vtgate/executor.go

@@ -121,7 +121,7 @@ type Executor struct {
 	queryLogger *streamlog.StreamLogger[*logstats.LogStats]
 
 	warmingReadsPercent int
-	warmingReadsPool    chan bool
+	warmingReadsChannel chan bool
 }
 
 var executorOnce sync.Once
@@ -167,7 +167,7 @@ func NewExecutor(
 		pv:                  pv,
 		plans:               plans,
 		warmingReadsPercent: warmingReadsPercent,
-		warmingReadsPool:    make(chan bool, warmingReadsPoolSize),
+		warmingReadsChannel: make(chan bool, warmingReadsConcurrency),
 	}
 
 	vschemaacl.Init()

go/vt/vtgate/vcursor_impl.go

@@ -115,7 +115,7 @@ type vcursorImpl struct {
 	pv       plancontext.PlannerVersion
 
 	warmingReadsPercent int
-	warmingReadsPool    chan bool
+	warmingReadsChannel chan bool
 }
 
 // newVcursorImpl creates a vcursorImpl. Before creating this object, you have to separate out any marginComments that came with
@@ -161,10 +161,10 @@ func newVCursorImpl(
 	}
 
 	warmingReadsPct := 0
-	var warmingReadsPool chan bool
+	var warmingReadsChan chan bool
 	if executor != nil {
 		warmingReadsPct = executor.warmingReadsPercent
-		warmingReadsPool = executor.warmingReadsPool
+		warmingReadsChan = executor.warmingReadsChannel
 	}
 	return &vcursorImpl{
 		safeSession:         safeSession,
@@ -182,7 +182,7 @@ func newVCursorImpl(
 		warnShardedOnly:     warnShardedOnly,
 		pv:                  pv,
 		warmingReadsPercent: warmingReadsPct,
-		warmingReadsPool:    warmingReadsPool,
+		warmingReadsChannel: warmingReadsChan,
 	}, nil
 }
 
@@ -1284,8 +1284,8 @@ func (vc *vcursorImpl) GetWarmingReadsPercent() int {
 	return vc.warmingReadsPercent
 }
 
-func (vc *vcursorImpl) GetWarmingReadsPool() chan bool {
-	return vc.warmingReadsPool
+func (vc *vcursorImpl) GetWarmingReadsChannel() chan bool {
+	return vc.warmingReadsChannel
 }
 
 func (vc *vcursorImpl) CloneForReplicaWarming(ctx context.Context) engine.VCursor {

go/vt/vtgate/vtgate.go

@@ -114,7 +114,7 @@ var (
 
 	warmingReadsPercent      = 0
 	warmingReadsQueryTimeout = 5 * time.Second
-	warmingReadsPoolSize     = 500
+	warmingReadsConcurrency  = 500
 )
 
 func registerFlags(fs *pflag.FlagSet) {
@@ -149,7 +149,7 @@ func registerFlags(fs *pflag.FlagSet) {
 	fs.BoolVar(&enableViews, "enable-views", enableViews, "Enable views support in vtgate.")
 	fs.BoolVar(&allowKillStmt, "allow-kill-statement", allowKillStmt, "Allows the execution of kill statement")
 	fs.IntVar(&warmingReadsPercent, "warming-reads-percent", 0, "Percentage of reads on the primary to forward to replicas. Useful for keeping buffer pools warm")
-	fs.IntVar(&warmingReadsPoolSize, "warming-reads-pool-size", 500, "Size of goroutine pool for warming reads")
+	fs.IntVar(&warmingReadsConcurrency, "warming-reads-concurrency", 500, "Number of concurrent warming reads allowed")
 	fs.DurationVar(&warmingReadsQueryTimeout, "warming-reads-query-timeout", 5*time.Second, "Timeout of warming read queries")
 
 	_ = fs.String("schema_change_signal_user", "", "User to be used to send down query to vttablet to retrieve schema changes")