add incremental rendering pause config

app/config.go

@@ -24,6 +24,7 @@ type Config struct {
 	RenderingFetchLimit       int                     `json:"renderingfetchlimit"`
 	RenderingJobs             int                     `json:"renderingjobs"`
 	RenderingQueue            int                     `json:"renderingqueue"`
+	IncrementalRenderingTimer string                  `json:"incrementalrenderingtimer"`
 	MapObjects                *MapObjectConfig        `json:"mapobjects"`
 	MapBlockAccessorCfg       *MapBlockAccessorConfig `json:"mapblockaccessor"`
 	DefaultOverlays           []string                `json:"defaultoverlays"`
@@ -182,6 +183,7 @@ func ParseConfig(filename string) (*Config, error) {
 		RenderingFetchLimit:       10000,
 		RenderingJobs:             runtime.NumCPU(),
 		RenderingQueue:            100,
+		IncrementalRenderingTimer: "5s",
 		MapObjects:                &mapobjs,
 		MapBlockAccessorCfg:       &mapblockaccessor,
 		DefaultOverlays:           defaultoverlays,

doc/config.md

@@ -43,6 +43,7 @@ The mapserver will generate a fresh `mapserver.json` if there is none at startup
 	"renderingfetchlimit": 1000,
 	"renderingjobs": 2,
 	"renderingqueue": 100,
+	"incrementalrenderingtimer": "5s",
 	"mapobjects": {
 		"bones": true,
 		"protector": true,
@@ -110,6 +111,9 @@ Number of mapblocks to collect at once while rendering:
 For a small system (Raspberry PI) a setting of 1000 is ok.
 Faster system can use the default (10'000)
 
+#### incrementalrenderingtimer
+Duration to let pass between incremental rendering executions.
+
 #### enableprometheus
 Enables the [Prometheus](./prometheus.md) metrics endpoint
 

tilerendererjob/incremental.go

@@ -31,7 +31,11 @@ func incrementalRender(ctx *app.App) {
 		}
 
 		if len(result.List) == 0 && !result.HasMore {
-			time.Sleep(5 * time.Second)
+			renderingDuration, err := time.ParseDuration(ctx.Config.IncrementalRenderingTimer)
+			if err != nil {
+				panic(err)
+			}
+			time.Sleep(renderingDuration)
 			continue
 		}