npawar commented on a change in pull request #6322: URL: https://github.com/apache/incubator-pinot/pull/6322#discussion_r536892454
########## File path: pinot-controller/src/main/java/org/apache/pinot/controller/util/ConsumingSegmentInfoReader.java ########## @@ -0,0 +1,162 @@ +/** + * 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.controller.util; + +import com.fasterxml.jackson.annotation.JsonIgnoreProperties; +import com.fasterxml.jackson.annotation.JsonProperty; +import com.fasterxml.jackson.core.type.TypeReference; +import com.google.common.collect.BiMap; +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.TreeMap; +import java.util.concurrent.Executor; +import org.apache.commons.httpclient.HttpConnectionManager; +import org.apache.pinot.common.exception.InvalidConfigException; +import org.apache.pinot.common.restlet.resources.SegmentConsumerInfo; +import org.apache.pinot.controller.helix.core.PinotHelixResourceManager; +import org.apache.pinot.spi.utils.JsonUtils; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +/** + * This is a helper class that calls the server API endpoints to fetch consuming segments info + * Only the servers returning success are returned by the method. For servers returning errors (http error or otherwise), + * no entry is created in the return list + */ +public class ConsumingSegmentInfoReader { + private static final Logger LOGGER = LoggerFactory.getLogger(ConsumingSegmentInfoReader.class); + + private final Executor _executor; + private final HttpConnectionManager _connectionManager; + private final PinotHelixResourceManager _pinotHelixResourceManager; + + public ConsumingSegmentInfoReader(Executor executor, HttpConnectionManager connectionManager, + PinotHelixResourceManager helixResourceManager) { + _executor = executor; + _connectionManager = connectionManager; + _pinotHelixResourceManager = helixResourceManager; + } + + /** + * This method retrieves the consuming segments info for a given realtime table. + * @return a map of segmentName to the information about its consumer + */ + public ConsumingSegmentsInfoMap getConsumingSegmentsInfo(String tableNameWithType, int timeoutMs) + throws InvalidConfigException { + final Map<String, List<String>> serverToSegments = + _pinotHelixResourceManager.getServerToSegmentsMap(tableNameWithType); + BiMap<String, String> serverToEndpoints = + _pinotHelixResourceManager.getDataInstanceAdminEndpoints(serverToSegments.keySet()); + + // Gets info for segments with LLRealtimeSegmentDataManager found in the table data manager + Map<String, List<SegmentConsumerInfo>> serverToSegmentConsumerInfoMap = + getConsumingSegmentsInfoFromServers(tableNameWithType, serverToEndpoints, timeoutMs); + TreeMap<String, List<ConsumingSegmentInfo>> consumingSegmentInfoMap = new TreeMap<>(); + for (Map.Entry<String, List<SegmentConsumerInfo>> entry : serverToSegmentConsumerInfoMap.entrySet()) { + String serverName = entry.getKey(); + for (SegmentConsumerInfo info : entry.getValue()) { + consumingSegmentInfoMap.computeIfAbsent(info.getSegmentName(), k -> new ArrayList<>()) + .add(new ConsumingSegmentInfo(serverName, info.getConsumerState(), info.getPartitionToOffset())); + } + } + // Segments which are in CONSUMING state but found no consumer on the server + List<String> consumingSegments = _pinotHelixResourceManager.getConsumingSegments(tableNameWithType); + consumingSegments.forEach(c -> consumingSegmentInfoMap.putIfAbsent(c, Collections.emptyList())); + return new ConsumingSegmentsInfoMap(consumingSegmentInfoMap); + } + + /** + * This method makes a MultiGet call to all servers to get the consuming segments info. + * @return servers queried and a list of consumer status information for consuming segments on that server + */ + private Map<String, List<SegmentConsumerInfo>> getConsumingSegmentsInfoFromServers(String tableNameWithType, + BiMap<String, String> serverToEndpoints, int timeoutMs) { + LOGGER.info("Reading consuming segment info from servers: {} for table: {}", serverToEndpoints.keySet(), + tableNameWithType); + + List<String> serverUrls = new ArrayList<>(serverToEndpoints.size()); + BiMap<String, String> endpointsToServers = serverToEndpoints.inverse(); + for (String endpoint : endpointsToServers.keySet()) { + String consumingSegmentInfoURI = generateServerURL(tableNameWithType, endpoint); + serverUrls.add(consumingSegmentInfoURI); + } + + CompletionServiceHelper completionServiceHelper = + new CompletionServiceHelper(_executor, _connectionManager, endpointsToServers); + CompletionServiceHelper.CompletionServiceResponse serviceResponse = + completionServiceHelper.doMultiGetRequest(serverUrls, tableNameWithType, timeoutMs); + Map<String, List<SegmentConsumerInfo>> serverToConsumingSegmentInfoList = new HashMap<>(); + int failedParses = 0; + for (Map.Entry<String, String> streamResponse : serviceResponse._httpResponses.entrySet()) { + try { + List<SegmentConsumerInfo> segmentConsumerInfos = + JsonUtils.stringToObject(streamResponse.getValue(), new TypeReference<List<SegmentConsumerInfo>>() { + }); + serverToConsumingSegmentInfoList.put(streamResponse.getKey(), segmentConsumerInfos); + } catch (IOException e) { + failedParses++; + LOGGER.error("Unable to parse server {} response due to an error: ", streamResponse.getKey(), e); + } + } + if (failedParses != 0) { + LOGGER.warn("Failed to parse {} / {} segment size info responses from servers.", failedParses, serverUrls.size()); + } + return serverToConsumingSegmentInfoList; + } + + private String generateServerURL(String tableNameWithType, String endpoint) { + return String.format("http://%s/tables/%s/consumingSegmentsInfo";, endpoint, tableNameWithType); + } + + /** + * Map containing all consuming segments and their status information + */ + @JsonIgnoreProperties(ignoreUnknown = true) + static public class ConsumingSegmentsInfoMap { + public TreeMap<String, List<ConsumingSegmentInfo>> _segmentToConsumingInfoMap; + + public ConsumingSegmentsInfoMap( + @JsonProperty("segmentToConsumingInfoMap") TreeMap<String, List<ConsumingSegmentInfo>> segmentToConsumingInfoMap) { + this._segmentToConsumingInfoMap = segmentToConsumingInfoMap; + } + } + + /** + * Contains all the information about a consuming segment + */ + @JsonIgnoreProperties(ignoreUnknown = true) Review comment: yes should be doable. 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