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https://issues.apache.org/jira/browse/FLINK-7781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16224594#comment-16224594
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ASF GitHub Bot commented on FLINK-7781:
---------------------------------------
Github user kl0u commented on a diff in the pull request:
https://github.com/apache/flink/pull/4901#discussion_r147653983
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/legacy/metrics/AggregatingSubtasksMetricsHandler.java
---
@@ -0,0 +1,70 @@
+/*
+ * 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.metrics;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.concurrent.Executor;
+
+import static
org.apache.flink.runtime.rest.handler.legacy.metrics.JobMetricsHandler.PARAMETER_JOB_ID;
+import static
org.apache.flink.runtime.rest.handler.legacy.metrics.JobVertexMetricsHandler.PARAMETER_VERTEX_ID;
+
+/**
+ * Request handler that returns, aggregated across all subtasks, a list of
all available metrics or the values
+ * for a set of metrics.
+ */
+public class AggregatingSubtasksMetricsHandler extends
AbstractAggregatingMetricsHandler {
+ public AggregatingSubtasksMetricsHandler(Executor executor,
MetricFetcher fetcher) {
+ super(executor, fetcher);
+ }
+
+ @Override
+ protected Collection<? extends MetricStore.ComponentMetricStore>
getStores(MetricStore store, Map<String, String> pathParameters, Map<String,
String> queryParameters) {
+ String jobID = pathParameters.get(PARAMETER_JOB_ID);
+ String taskID = pathParameters.get(PARAMETER_VERTEX_ID);
--- End diff --
What happens here if `jobID == null`?
> Support simple on-demand metrics aggregation
> --------------------------------------------
>
> Key: FLINK-7781
> URL: https://issues.apache.org/jira/browse/FLINK-7781
> Project: Flink
> Issue Type: Improvement
> Components: Metrics, REST
> Affects Versions: 1.4.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Fix For: 1.4.0
>
>
> We should support aggregations (min, max, avg, sum) of metrics in the REST
> API. This is primarily about aggregating across subtasks, for example the
> number of incoming records across all subtasks.
> This is useful for simple use-cases where a dedicated metrics backend is
> overkill, and will allow us to provide better metrics in the web UI (since we
> can expose these aggregated as well).
> I propose to add a new query parameter "agg=[min,max,avg,sum]". As a start
> this parameter should only be used for task metrics. (This is simply the main
> use-case i have in mind)
> The aggregation should (naturally) only work for numeric metrics.
> We will need a HashSet of metrics that exist for subtasks of a given tasks
> that has to be updated in {{MetricStore#add}}.
> All task metrics are either stored as
> # {{<subtask-index>.<metric>}} or
> # {{<subtask-index>.<operator-name>.<metric>}}.
> If a user sends a request {{get=mymetric,agg=sum}}, only the metrics of the
> first kind are to be considered. Similarly, given a request
> {{get=myoperator.mymetric,agg=sum}} only metrics of the second kind are to be
> considered.
> Ideally, the name of the aggregated metric (i.e. the original name without
> subtask index) is also contained in the list of available metrics.
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