jugomezv commented on code in PR #9994: URL: https://github.com/apache/pinot/pull/9994#discussion_r1060800029
########## pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/ConsumptionDelayTracker.java: ########## @@ -0,0 +1,295 @@ +/** + * 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.pinot.core.data.manager.realtime; + +import com.google.common.annotations.VisibleForTesting; +import java.util.HashSet; +import java.util.List; +import java.util.Timer; +import java.util.TimerTask; +import java.util.concurrent.ConcurrentHashMap; +import org.apache.pinot.common.metrics.ServerGauge; +import org.apache.pinot.common.metrics.ServerMetrics; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +/** + * A Class to track maximum realtime delay for a given table on a given server. + * Highlights: + * 1-An object of this class is hosted by each RealtimeTableDataManager. + * 2-The object tracks ingestion delays for all partitions hosted by the current server for the given Realtime table. + * 3-Partition delays are updated by all LLRealtimeSegmentDataManager objects hosted in the corresponding + * RealtimeTableDataManager. + * 4-The class tracks the maximum of all ingestion delays observed for all partitions of the given table. + * 5-A Metric is derived from reading the maximum tracked by this class. + * 6-Delay reported for partitions that do not have events to consume is reported as zero. + * 7-We track the time at which each delay sample was collected so that delay can be increased when partition stops + * consuming for any reason other than no events being available for consumption. + * 8-Segments that go from CONSUMING to DROPPED states stop being tracked so their delays do not cloud + * delays of active partitions. + * 9-When a segment goes from CONSUMING to ONLINE, we start ticking time for the corresponding partition. + * If no consumption is noticed after a timeout, then we read ideal state to confirm the server still hosts the + * partition. If not, we stop tracking the respective partition. + * 10-A timer thread is started by this object to track timeouts of partitions and drive the reading of their ideal + * state. + * + * The following diagram illustrates the object interactions with main external APIs + * + * (CONSUMING -> ONLINE state change) + * | + * markPartition(partitionId) |<-recordPinotConsumptionDelay()-{LLRealtimeSegmentDataManager(Partition 0}} + * | | + * ___________V_________________________V_ + * | (Table X) |<-recordPinotConsumptionDelay()-{LLRealtimeSegmentDataManager(Partition 1}} + * | ConsumptionDelayTracker| ... + * |____________________________________|<-recordPinotConsumptionDelay()-{LLRealtimeSegmentDataManager (Partition n}} + * ^ ^ + * | \ + * timeoutInactivePartitions() stopTrackingPinotConsumptionDelay(partitionId) + * _________|__________ \ + * | TimerTrackingTask | (CONSUMING -> DROPPED state change) + * |___________________| + * + */ + +public class ConsumptionDelayTracker { + /* + * Class to handle timer thread that will track inactive partitions + */ + private class TrackingTimerTask extends TimerTask { + private String _name; + private ConsumptionDelayTracker _tracker; + + public TrackingTimerTask(String name, ConsumptionDelayTracker tracker) { + _name = name; + _tracker = tracker; + } + + @Override + public void run() { + // tick inactive partitions every interval of time to keep tracked partitions up to date + _tracker.timeoutInactivePartitions(); + } + } + + /* + * Class to keep a Pinot Consumption Delay measure and the time when the sample was taken (i.e. sample time) + * We will use the sample time to increase consumption delay when a partition stops consuming: the time + * difference between the sample time and current time will be added to the metric when read. + */ + static private class DelayMeasure { + public DelayMeasure(long t, long d) { + _delayMilliseconds = d; + _sampleTime = t; + } + public long _delayMilliseconds; Review Comment: Done -- This is an automated message from the Apache Git Service. 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