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ASF GitHub Bot commented on FLINK-4167: --------------------------------------- Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/2210#discussion_r70597751 --- Diff: flink-core/src/main/java/org/apache/flink/metrics/groups/ProxyMetricGroup.java --- @@ -0,0 +1,100 @@ +/* + * 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.metrics.groups; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.metrics.Counter; +import org.apache.flink.metrics.Gauge; +import org.apache.flink.metrics.Histogram; +import org.apache.flink.metrics.MetricGroup; +import org.apache.flink.util.Preconditions; + +/** + * Metric group which forwards all registration calls to its parent metric group. + * + * @param <P> Type of the parent metric group + */ +@Internal +public class ProxyMetricGroup<P extends MetricGroup> implements MetricGroup { + private final P parentMetricGroup; + + public ProxyMetricGroup(P parentMetricGroup) { + this.parentMetricGroup = Preconditions.checkNotNull(parentMetricGroup); + } + + @Override + public final void close() { + parentMetricGroup.close(); --- End diff -- It is safer to not do anything here. `close()` should only be called by the Task on the `TaskMetricGroup`, this would open us to the possibility of components closing the TaskMG as well. There's also the looming StackOverflow when someone puts `ioMetrics.close()` into the `TaskMetricGroup#close()`. Now that i think about it i believe `close()` (and by extension, `isClosed()`) has no business being in the MetricGroup interface in the first place, as users actually don't need to call it. > TaskMetricGroup does not close IOMetricGroup > -------------------------------------------- > > Key: FLINK-4167 > URL: https://issues.apache.org/jira/browse/FLINK-4167 > Project: Flink > Issue Type: Bug > Components: Metrics > Affects Versions: 1.1.0 > Reporter: Till Rohrmann > Assignee: Till Rohrmann > Fix For: 1.1.0 > > > The {{TaskMetricGroup}} does not close the {{ioMetrics}} metric group. This > causes that metrics registered under the {{ioMetrics}} are not deregistered > after the termination of a job. -- This message was sent by Atlassian JIRA (v6.3.4#6332)