diff --git a/app/config.go b/app/config.go
index 9ef0fe7..d49043b 100644
--- a/app/config.go
+++ b/app/config.go
@@ -62,6 +62,7 @@ type Configuration struct {
 	AppName         string                    `mapstructure:"app_name,omitempty"`
 	BackendID       string                    `mapstructure:"backend_id,omitempty"`
 	BuildEnv        string                    `mapstructure:"build_env,omitempty"`
+	CacheSizes      map[string]CacheSize      `mapstructure:"cache_sizes,omitempty"`
 	ClusterID       string                    `mapstructure:"cluster_id,omitempty"`
 	Chunks          map[string]Chunk          `mapstructure:"chunks,omitempty"`
 	DBMS            string                    `mapstructure:"dbms,omitempty"`
@@ -87,6 +88,16 @@ type Configuration struct {
 	Workers         map[string]Worker         `mapstructure:"workers,omitempty"`
 }
 
+// GetCacheSize returns the named cache size
+func GetCacheSize(name string) int64 {
+	obj, ok := config.CacheSizes[name]
+	if ok {
+		return obj.Increment
+	}
+	sugar.Warnf("app.GetCacheSize: unknown cache size identifier: %s", name)
+	return 0
+}
+
 // GetPDFRenderEngine returns a config file parameter
 func GetPDFRenderEngine() string {
 	return config.PDFRenderEngine