| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.metrics2.host.aggregator; |
| |
| import com.google.common.cache.Cache; |
| import com.google.common.cache.CacheBuilder; |
| import org.apache.hadoop.metrics2.sink.timeline.TimelineMetric; |
| import org.apache.hadoop.metrics2.sink.timeline.TimelineMetrics; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeMap; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| /** |
| * Singleton class with 2 guava caches for raw and aggregated metrics storing |
| */ |
| public class TimelineMetricsHolder { |
| private static final int DEFAULT_RAW_CACHE_EXPIRE_TIME = 60; |
| private static final int DEFAULT_AGGREGATION_CACHE_EXPIRE_TIME = 300; |
| private Cache<String, TimelineMetrics> aggregationMetricsCache; |
| private Cache<String, TimelineMetrics> rawMetricsCache; |
| private static TimelineMetricsHolder instance = null; |
| //to ensure no metric values are expired |
| private static int EXPIRE_DELAY = 30; |
| ReadWriteLock aggregationCacheLock = new ReentrantReadWriteLock(); |
| ReadWriteLock rawCacheLock = new ReentrantReadWriteLock(); |
| private List<String> skipAggregationPatternStrings = new ArrayList<>(); |
| |
| private TimelineMetricsHolder(int rawCacheExpireTime, int aggregationCacheExpireTime, List<String> skipAggregationPatternStrings) { |
| this.rawMetricsCache = CacheBuilder.newBuilder().expireAfterWrite(rawCacheExpireTime + EXPIRE_DELAY, TimeUnit.SECONDS).build(); |
| this.aggregationMetricsCache = CacheBuilder.newBuilder().expireAfterWrite(aggregationCacheExpireTime + EXPIRE_DELAY, TimeUnit.SECONDS).build(); |
| this.skipAggregationPatternStrings = skipAggregationPatternStrings; |
| } |
| |
| public static TimelineMetricsHolder getInstance(int rawCacheExpireTime, int aggregationCacheExpireTime, List<String> skipAggregationPatternStrings) { |
| if (instance == null) { |
| instance = new TimelineMetricsHolder(rawCacheExpireTime, aggregationCacheExpireTime, skipAggregationPatternStrings); |
| } |
| return instance; |
| } |
| |
| /** |
| * Uses default expiration time for caches initialization if they are not initialized yet. |
| * @return |
| */ |
| public static TimelineMetricsHolder getInstance() { |
| return getInstance(DEFAULT_RAW_CACHE_EXPIRE_TIME, DEFAULT_AGGREGATION_CACHE_EXPIRE_TIME, Collections.emptyList()); |
| } |
| |
| public void putMetricsForAggregationPublishing(TimelineMetrics timelineMetrics) { |
| |
| //Remove metrics that need to be skipped during caching stage itself. |
| for (Iterator<TimelineMetric> iterator = timelineMetrics.getMetrics().iterator(); iterator.hasNext();) { |
| TimelineMetric timelineMetric = iterator.next(); |
| for (String pattern : skipAggregationPatternStrings) { |
| if (timelineMetric.getMetricName().matches(pattern)) { |
| iterator.remove(); |
| } |
| } |
| } |
| aggregationCacheLock.writeLock().lock(); |
| aggregationMetricsCache.put(calculateCacheKey(timelineMetrics), timelineMetrics); |
| aggregationCacheLock.writeLock().unlock(); |
| } |
| |
| private String calculateCacheKey(TimelineMetrics timelineMetrics) { |
| List<TimelineMetric> metrics = timelineMetrics.getMetrics(); |
| if (metrics.size() > 0) { |
| return metrics.get(0).getAppId() + System.currentTimeMillis(); |
| } |
| return String.valueOf(System.currentTimeMillis()); |
| } |
| |
| public Map<String, TimelineMetrics> extractMetricsForAggregationPublishing() { |
| return extractMetricsFromCacheWithLock(aggregationMetricsCache, aggregationCacheLock); |
| } |
| |
| public void putMetricsForRawPublishing(TimelineMetrics metrics) { |
| rawCacheLock.writeLock().lock(); |
| rawMetricsCache.put(calculateCacheKey(metrics), metrics); |
| rawCacheLock.writeLock().unlock(); |
| } |
| |
| public Map<String, TimelineMetrics> extractMetricsForRawPublishing() { |
| return extractMetricsFromCacheWithLock(rawMetricsCache, rawCacheLock); |
| } |
| |
| /** |
| * Returns values from cache and clears the cache |
| * @param cache |
| * @param lock |
| * @return |
| */ |
| private Map<String, TimelineMetrics> extractMetricsFromCacheWithLock(Cache<String, TimelineMetrics> cache, ReadWriteLock lock) { |
| lock.writeLock().lock(); |
| Map<String, TimelineMetrics> metricsMap = new TreeMap<>(cache.asMap()); |
| cache.invalidateAll(); |
| lock.writeLock().unlock(); |
| return metricsMap; |
| } |
| |
| } |