Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/3348#discussion_r105742696
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/InputGateMetrics.java
---
@@ -0,0 +1,168 @@
+/*
+ * 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.io.network.partition.consumer;
+
+import org.apache.flink.metrics.Gauge;
+import org.apache.flink.metrics.MetricGroup;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+public class InputGateMetrics {
+
+ private final SingleInputGate inputGate;
+
+ private long lastTotal = -1;
+
+ private int lastMin = -1;
+
+ private int lastMax = -1;
+
+ private float lastAvg = -1.0f;
+
+ //
------------------------------------------------------------------------
+
+ private InputGateMetrics(SingleInputGate inputGate) {
+ this.inputGate = checkNotNull(inputGate);
+ }
+
+ //
------------------------------------------------------------------------
+
+ // these methods are package private to make access from the nested
classes faster
+
+ long refreshAndGetTotal() {
+ long total;
+ if ((total = lastTotal) == -1) {
+ refresh();
--- End diff --
I guess the main reason for this was performance in case all (up to) 4
metrics are requested. What's the preferred way of exposing these kind of
metrics? Should I gather all 4 in a custom object and enclose that one in a
Gauge? How could the metrics then be displayed, e.g. in the web interface?
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