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https://issues.apache.org/jira/browse/FLINK-4389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15426764#comment-15426764
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ASF GitHub Bot commented on FLINK-4389:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2363#discussion_r75342927
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/metrics/MetricQueryService.java
---
@@ -0,0 +1,180 @@
+/*
+ * 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.metrics;
+
+import akka.actor.ActorRef;
+import akka.actor.ActorSystem;
+import akka.actor.Props;
+import akka.actor.UntypedActor;
+import org.apache.flink.api.java.tuple.Tuple3;
+import org.apache.flink.metrics.CharacterFilter;
+import org.apache.flink.metrics.Counter;
+import org.apache.flink.metrics.Gauge;
+import org.apache.flink.metrics.Histogram;
+import org.apache.flink.metrics.HistogramStatistics;
+import org.apache.flink.metrics.Metric;
+import org.apache.flink.runtime.metrics.groups.AbstractMetricGroup;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * The MetricQueryService creates a key-value representation of all
metrics currently registered with Flink when queried.
+ *
+ * It is realized as an actor and receives the following messages:
+ * - {@code Tuple3<String, Metric, AbstractMetricGroup> => Notification of
added Metric}
+ * - {@code Metric => Notification of removed Metric}
+ * - {@code ActorRef => Query for metric dump}
+ */
+public class MetricQueryService extends UntypedActor {
+ private static final Logger LOG =
LoggerFactory.getLogger(MetricQueryService.class);
+
+ public static final byte CATEGORY_COUNTER = 0;
+ public static final byte CATEGORY_GAUGE = 1;
+ public static final byte CATEGORY_HISTOGRAM = 2;
+
+ private final Map<Gauge<?>, String> gauges = new HashMap<>();
+ private final Map<Counter, String> counters = new HashMap<>();
+ private final Map<Histogram, String> histograms = new HashMap<>();
+
+ private final List<Metric> toRemove = new ArrayList<>();
+
+ @Override
+ public void onReceive(Object message) throws Exception {
+ try {
+ if (message instanceof Tuple3) { // add metric
--- End diff --
I think we should create proper message types instead of using a `Tuple3`
here.
> Expose metrics to Webfrontend
> -----------------------------
>
> Key: FLINK-4389
> URL: https://issues.apache.org/jira/browse/FLINK-4389
> Project: Flink
> Issue Type: Sub-task
> Components: Metrics, Webfrontend
> Affects Versions: 1.1.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Fix For: pre-apache
>
>
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-7%3A+Expose+metrics+to+WebInterface
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