Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/5443#discussion_r167268048
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/legacy/backpressure/VoidBackPressureStatsTracker.java
---
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.rest.handler.legacy.backpressure;
+
+import org.apache.flink.runtime.executiongraph.ExecutionJobVertex;
+
+import java.util.Optional;
+
+/**
+ * {@link BackPressureStatsTracker} implementation which returns always no
back pressure statistics.
--- End diff --
switch "returns" and "always"?
---
