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/*
* 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.jackrabbit.oak.plugins.index.elastic;
import org.apache.jackrabbit.oak.plugins.metric.util.StatsProviderUtil;
import org.apache.jackrabbit.oak.stats.HistogramStats;
import org.apache.jackrabbit.oak.stats.MeterStats;
import org.apache.jackrabbit.oak.stats.StatisticsProvider;
import org.apache.jackrabbit.oak.stats.TimerStats;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.function.BiFunction;
/**
* Provides high level functions to track and measure activities against Elastic.
*/
public class ElasticMetricHandler {
private static final String QUERY_RATE = "ELASTIC_QUERY_RATE";
private static final String QUERY_INTERNAL_RATE = "ELASTIC_QUERY_INTERNAL_RATE";
private static final String QUERY_HITS = "ELASTIC_QUERY_HITS";
private static final String QUERY_SERVER_TIME = "ELASTIC_QUERY_SERVER_TIME";
private static final String QUERY_TOTAL_TIME = "ELASTIC_QUERY_TOTAL_TIME";
private static final String QUERY_TIMED_OUT_RATE = "ELASTIC_QUERY_TIMED_OUT_RATE";
private static final String QUERY_FAILED_RATE = "ELASTIC_QUERY_FAILED_RATE";
private static final String INDEX_DOCUMENTS = "ELASTIC_INDEX_DOCUMENTS";
private static final String INDEX_SIZE = "ELASTIC_INDEX_SIZE";
private static final String INDEX_WITH_REPLICAS_SIZE = "ELASTIC_INDEX_WITH_REPLICAS_SIZE";
private final BiFunction<String, Map<String, String>, MeterStats> meter;
private final BiFunction<String, Map<String, String>, HistogramStats> histogram;
private final BiFunction<String, Map<String, String>, TimerStats> timer;
public ElasticMetricHandler(StatisticsProvider sp) {
StatsProviderUtil statsProviderUtil = new StatsProviderUtil(sp);
meter = statsProviderUtil.getMeterStats();
histogram = statsProviderUtil.getHistoStats();
timer = statsProviderUtil.getTimerStats();
}
/**
* Tracks a new query using two metrics:
* <ul>
* <li>{@code QUERY_RATE}</li>
* <li>{@code QUERY_INTERNAL_RATE}</li>
* </ul>
*
* @param index the index passed as metric label
* @param isRootQuery if {@code false} only {@code QUERY_INTERNAL_RATE} gets incremented
*/
public void markQuery(String index, boolean isRootQuery) {
Map<String, String> labels = Collections.singletonMap("index", index);
if (isRootQuery) {
meter.apply(QUERY_RATE, labels).mark();
}
meter.apply(QUERY_INTERNAL_RATE, labels).mark();
}
/**
* Measures a single query execution
*
* @param index the index passed as metric label
* @param hits the number of hits in the result set
* @param serverTimeMs the Elastic server time in milliseconds
* @param totalTimeMs the complete query execution time
* @param timedOut Elastic could time out while returning partial results. When {@code true} these
* occurrences get tracked
*/
public void measureQuery(String index, int hits, long serverTimeMs, long totalTimeMs, boolean timedOut) {
Map<String, String> labels = Collections.singletonMap("index", index);
histogram.apply(QUERY_HITS, labels).update(hits);
timer.apply(QUERY_SERVER_TIME, labels).update(serverTimeMs, TimeUnit.MILLISECONDS);
timer.apply(QUERY_TOTAL_TIME, labels).update(totalTimeMs, TimeUnit.MILLISECONDS);
if (timedOut) {
meter.apply(QUERY_TIMED_OUT_RATE, labels).mark();
}
}
/**
* Measures a failed query execution
*
* @param index the index passed as metric label
* @param totalTimeMs the total execution time
*/
public void measureFailedQuery(String index, long totalTimeMs) {
Map<String, String> labels = Collections.singletonMap("index", index);
meter.apply(QUERY_FAILED_RATE, labels).mark();
timer.apply(QUERY_TOTAL_TIME, labels).update(totalTimeMs, TimeUnit.MILLISECONDS);
}
/**
* Tracks the number of document in an index
*
* @param index the index passed as metric label
* @param numDocs the current number of documents. Only top level documents are tracked
*/
public void markDocuments(String index, long numDocs) {
Map<String, String> labels = Collections.singletonMap("index", index);
histogram.apply(INDEX_DOCUMENTS, labels).update(numDocs);
}
/**
* Tracks the size of an index
*
* @param index the index passed as metric label
* @param primarySize the primary shards size
* @param storeSize the total size in bytes. The value includes potential replicas
*/
public void markSize(String index, long primarySize, long storeSize) {
Map<String, String> labels = Collections.singletonMap("index", index);
histogram.apply(INDEX_SIZE, labels).update(primarySize);
histogram.apply(INDEX_WITH_REPLICAS_SIZE, labels).update(storeSize);
}
}