slfan1989 commented on code in PR #4963: URL: https://github.com/apache/hadoop/pull/4963#discussion_r1030952431
########## hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/federation/FederationStateStoreServiceMetrics.java: ########## @@ -0,0 +1,194 @@ +/* + * 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.hadoop.yarn.server.resourcemanager.federation; + +import org.apache.hadoop.classification.VisibleForTesting; +import org.apache.hadoop.metrics2.MetricsInfo; +import org.apache.hadoop.metrics2.annotation.Metric; +import org.apache.hadoop.metrics2.annotation.Metrics; +import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem; +import org.apache.hadoop.metrics2.lib.MetricsRegistry; +import org.apache.hadoop.metrics2.lib.MutableCounterLong; +import org.apache.hadoop.metrics2.lib.MutableQuantiles; +import org.apache.hadoop.metrics2.lib.MutableRate; +import org.apache.hadoop.yarn.server.federation.store.FederationStateStore; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.lang.reflect.Method; +import java.util.HashMap; +import java.util.Map; + +import static org.apache.hadoop.metrics2.lib.Interns.info; + +@Metrics(about = "Metrics for FederationStateStoreService", context = "fedr") +public final class FederationStateStoreServiceMetrics { + + public static final Logger LOG = + LoggerFactory.getLogger(FederationStateStoreServiceMetrics.class); + + private static final MetricsInfo RECORD_INFO = + info("FederationStateStoreServiceMetrics", "Metrics for the RM FederationStateStoreService"); + + private static volatile FederationStateStoreServiceMetrics instance = null; + private MetricsRegistry registry; + + private final static Method[] STATESTORE_API_METHODS = FederationStateStore.class.getMethods(); + + // Map method names to counter objects + private static final Map<String, MutableCounterLong> FAILED_CALLS = new HashMap<>(); + private static final Map<String, MutableRate> SUCCESSFUL_CALLS = new HashMap<>(); + // Provide quantile latency for each api call. + private static final Map<String, MutableQuantiles> QUANTILE_METRICS = new HashMap<>(); + + // Error string templates for logging calls from methods not in + // FederationStateStore API + private static final String UNKOWN_FAIL_ERROR_MSG = + "Not recording failed call for unknown FederationStateStore method {}"; + private static final String UNKNOWN_SUCCESS_ERROR_MSG = + "Not recording successful call for unknown FederationStateStore method {}"; + + /** + * Initialize the singleton instance. + * + * @return the singleton + */ + public static FederationStateStoreServiceMetrics getMetrics() { + synchronized (FederationStateStoreServiceMetrics.class) { + if (instance == null) { + instance = DefaultMetricsSystem.instance() + .register(new FederationStateStoreServiceMetrics()); + } + } + return instance; + } + + private FederationStateStoreServiceMetrics() { + registry = new MetricsRegistry(RECORD_INFO); + registry.tag(RECORD_INFO, "FederationStateStoreServiceMetrics"); + + // Create the metrics for each method and put them into the map + for (Method m : STATESTORE_API_METHODS) { + String methodName = m.getName(); + LOG.debug("Registering Federation StateStore Service metrics for {}", methodName); + + // This metric only records the number of failed calls; it does not + // capture latency information + FAILED_CALLS.put(methodName, registry.newCounter(methodName + "NumFailedCalls", + "# failed calls to " + methodName, 0L)); + + // This metric records both the number and average latency of successful + // calls. + SUCCESSFUL_CALLS.put(methodName, registry.newRate(methodName + "SuccessfulCalls", + "# successful calls and latency(ms) for" + methodName)); + + // This metric records the quantile-based latency of each successful call, + // re-sampled every 10 seconds. + QUANTILE_METRICS.put(methodName, registry.newQuantiles(methodName + "Latency", + "Quantile latency (ms) for " + methodName, "ops", "latency", 10)); + } + } + + // Aggregate metrics are shared, and don't have to be looked up per call + @Metric("Total number of successful calls and latency(ms)") + private static MutableRate totalSucceededCalls; + + @Metric("Total number of failed StateStore calls") + private static MutableCounterLong totalFailedCalls; + + public static void failedStateStoreServiceCall() { + String methodName = Thread.currentThread().getStackTrace()[2].getMethodName(); + MutableCounterLong methodMetric = FAILED_CALLS.get(methodName); + + if (methodMetric == null) { + LOG.error(UNKOWN_FAIL_ERROR_MSG, methodName); + return; + } + + totalFailedCalls.incr(); + methodMetric.incr(); + } + + public static void failedStateStoreServiceCall(String methodName) { + MutableCounterLong methodMetric = FAILED_CALLS.get(methodName); + if (methodMetric == null) { + LOG.error(UNKOWN_FAIL_ERROR_MSG, methodName); + return; + } + totalFailedCalls.incr(); + methodMetric.incr(); + } + + public static void succeededStateStoreServiceCall(long duration) { + String methodName = Thread.currentThread().getStackTrace()[2].getMethodName(); Review Comment: Thanks for your suggestion, I will refactor this part of the code. -- This is an automated message from the Apache Git Service. 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