sv2000 commented on a change in pull request #2667: [GOBBLIN-800] Remove the
metric context cache from GobblinMetricsRegistry
URL: https://github.com/apache/incubator-gobblin/pull/2667#discussion_r291757745
##
File path:
gobblin-runtime/src/main/java/org/apache/gobblin/runtime/util/ForkMetrics.java
##
@@ -0,0 +1,80 @@
+/*
+ * 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.gobblin.runtime.util;
+
+import java.util.List;
+import java.util.concurrent.Callable;
+
+import com.google.common.collect.ImmutableList;
+
+import org.apache.gobblin.configuration.ConfigurationKeys;
+import org.apache.gobblin.configuration.State;
+import org.apache.gobblin.metrics.GobblinMetrics;
+import org.apache.gobblin.metrics.MetricContext;
+import org.apache.gobblin.metrics.Tag;
+import org.apache.gobblin.runtime.TaskState;
+import org.apache.gobblin.runtime.fork.Fork;
+
+/**
+ * An extension to {@link GobblinMetrics} specifically for {@link Fork}.
+ */
+public class ForkMetrics extends GobblinMetrics {
+ private static final String FORK_METRICS_BRANCH_NAME_KEY = "forkBranchName";
+
+ protected ForkMetrics(TaskState taskState, int index) {
+super(name(taskState, index), parentContextForFork(taskState),
getForkMetricsTags(taskState, index));
+ }
+
+ private static MetricContext parentContextForFork(TaskState taskState) {
+return TaskMetrics.get(METRICS_ID_PREFIX + taskState.getJobId() + "." +
taskState.getTaskId()).getMetricContext();
+ }
+
+ public static ForkMetrics get(final TaskState taskState, int index) {
+return (ForkMetrics) GOBBLIN_METRICS_REGISTRY.getOrDefault(name(taskState,
index), new Callable() {
+ @Override
+ public GobblinMetrics call() throws Exception {
+return new ForkMetrics(taskState, index);
+ }
+});
+ }
+
+ /**
+ * Creates a unique {@link String} representing this branch.
+ */
+ private static String getForkMetricsId(State state, int index) {
+return state.getProp(ConfigurationKeys.FORK_BRANCH_NAME_KEY + "." + index,
+ConfigurationKeys.DEFAULT_FORK_BRANCH_NAME + index);
+ }
+
+ /**
+ * Creates a {@link List} of {@link Tag}s for a {@link Fork} instance. The
{@link Tag}s are purely based on the
+ * index and the branch name.
+ */
+ private static List> getForkMetricsTags(State state, int index) {
+return ImmutableList.>of(new Tag<>(FORK_METRICS_BRANCH_NAME_KEY,
getForkMetricsId(state, index)));
Review comment:
Maybe add a null check here i.e. if (getForkMetricsId(state,index) != null)?
Else, ImmutableList.of() may throw an exception.
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