in flink-connector-gcp-pubsub/src/main/java/org/apache/flink/streaming/connectors/gcp/pubsub/PubSubSource.java [118:121]
private boolean hasNoCheckpointingEnabled(RuntimeContext runtimeContext) {
return !(runtimeContext instanceof StreamingRuntimeContext
&& ((StreamingRuntimeContext) runtimeContext).isCheckpointingEnabled());
}