private String getExtraProperty(Map<String, String> properties, String key) {
    return properties.getOrDefault(
        EXTRA_PROPERTY_PREFIX + key, EXTRA_PROPERTY_DEFAULTS.getOrDefault(key, null));
  }
Kubernetes Optimizer Container with Standalone Optimizer
amoro-ams/src/main/java/org/apache/amoro/server/manager/KubernetesOptimizerContainer.java