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+/**
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package org.apache.hadoop.yarn.server.timelineservice.collector;
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+
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+import com.google.common.util.concurrent.ThreadFactoryBuilder;
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+import org.apache.commons.logging.Log;
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+import org.apache.commons.logging.LogFactory;
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+import org.apache.hadoop.classification.InterfaceAudience.Private;
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+import org.apache.hadoop.classification.InterfaceStability.Unstable;
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+import org.apache.hadoop.yarn.api.records.ApplicationId;
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+import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntities;
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+import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity;
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+import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntityType;
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+import org.apache.hadoop.conf.Configuration;
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+
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+import java.util.HashSet;
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+import java.util.Map;
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+import java.util.Set;
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+import java.util.concurrent.ScheduledThreadPoolExecutor;
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+import java.util.concurrent.TimeUnit;
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+
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+/**
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+ * Service that handles aggregations for applications
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+ * and makes use of {@link AppLevelTimelineCollector} class for
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+ * writes to Timeline Service.
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+ *
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+ * App-related lifecycle management is handled by this service.
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+ */
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+@Private
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+@Unstable
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+public class AppLevelTimelineCollectorWithAgg
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+ extends AppLevelTimelineCollector {
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+ private static final Log LOG = LogFactory.getLog(TimelineCollector.class);
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+
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+ private final static int AGGREGATION_EXECUTOR_NUM_THREADS = 1;
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+ private final static int AGGREGATION_EXECUTOR_EXEC_INTERVAL_SECS = 15;
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+ private static Set<String> entityTypesSkipAggregation
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+ = initializeSkipSet();
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+
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+ private ScheduledThreadPoolExecutor appAggregationExecutor;
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+ private AppLevelAggregator appAggregator;
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+
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+ public AppLevelTimelineCollectorWithAgg(ApplicationId appId) {
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+ super(appId);
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+ }
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+
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+ private static Set<String> initializeSkipSet() {
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+ Set<String> result = new HashSet<>();
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+ result.add(TimelineEntityType.YARN_APPLICATION.toString());
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+ result.add(TimelineEntityType.YARN_FLOW_RUN.toString());
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+ result.add(TimelineEntityType.YARN_FLOW_ACTIVITY.toString());
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+ return result;
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+ }
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+
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+ @Override
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+ protected void serviceInit(Configuration conf) throws Exception {
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+ super.serviceInit(conf);
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+ }
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+
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+ @Override
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+ protected void serviceStart() throws Exception {
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+ // Launch the aggregation thread
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+ appAggregationExecutor = new ScheduledThreadPoolExecutor(
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+ AppLevelTimelineCollectorWithAgg.AGGREGATION_EXECUTOR_NUM_THREADS,
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+ new ThreadFactoryBuilder()
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+ .setNameFormat("TimelineCollector Aggregation thread #%d")
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+ .build());
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+ appAggregator = new AppLevelAggregator();
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+ appAggregationExecutor.scheduleAtFixedRate(appAggregator,
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+ AppLevelTimelineCollectorWithAgg.
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+ AGGREGATION_EXECUTOR_EXEC_INTERVAL_SECS,
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+ AppLevelTimelineCollectorWithAgg.
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+ AGGREGATION_EXECUTOR_EXEC_INTERVAL_SECS,
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+ TimeUnit.SECONDS);
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+ super.serviceStart();
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+ }
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+
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+ @Override
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+ protected void serviceStop() throws Exception {
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+ appAggregationExecutor.shutdown();
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+ if (!appAggregationExecutor.awaitTermination(10, TimeUnit.SECONDS)) {
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+ LOG.info("App-level aggregator shutdown timed out, shutdown now. ");
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+ appAggregationExecutor.shutdownNow();
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+ }
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+ // Perform one round of aggregation after the aggregation executor is done.
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+ appAggregator.aggregate();
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+ super.serviceStop();
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+ }
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+
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+ @Override
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+ protected Set<String> getEntityTypesSkipAggregation() {
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+ return entityTypesSkipAggregation;
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+ }
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+
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+ private class AppLevelAggregator implements Runnable {
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+
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+ private void aggregate() {
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+ if (LOG.isDebugEnabled()) {
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+ LOG.debug("App-level real-time aggregating");
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+ }
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+ if (!isReadyToAggregate()) {
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+ LOG.warn("App-level collector is not ready, skip aggregation. ");
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+ return;
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+ }
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+ try {
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+ TimelineCollectorContext currContext = getTimelineEntityContext();
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+ Map<String, AggregationStatusTable> aggregationGroups
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+ = getAggregationGroups();
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+ if (aggregationGroups == null
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+ || aggregationGroups.isEmpty()) {
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+ LOG.debug("App-level collector is empty, skip aggregation. ");
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+ return;
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+ }
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+ TimelineEntity resultEntity = TimelineCollector.aggregateWithoutGroupId(
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+ aggregationGroups, currContext.getAppId(),
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+ TimelineEntityType.YARN_APPLICATION.toString());
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+ TimelineEntities entities = new TimelineEntities();
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+ entities.addEntity(resultEntity);
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+ putEntitiesAsync(entities, getCurrentUser());
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+ } catch (Exception e) {
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+ LOG.error("Error aggregating timeline metrics", e);
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+ }
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+ if (LOG.isDebugEnabled()) {
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+ LOG.debug("App-level real-time aggregation complete");
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+ }
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+ }
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+
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+ @Override
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+ public void run() {
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+ aggregate();
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+ }
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+ }
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+
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+}
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Rohith Sharma K S