| /* |
| * 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.iotdb.db.query.control; |
| |
| import org.apache.iotdb.commons.concurrent.IoTDBThreadPoolFactory; |
| import org.apache.iotdb.commons.service.IService; |
| import org.apache.iotdb.commons.service.ServiceType; |
| import org.apache.iotdb.db.conf.IoTDBDescriptor; |
| import org.apache.iotdb.db.exception.query.QueryTimeoutRuntimeException; |
| import org.apache.iotdb.db.query.context.QueryContext; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * This class is used to monitor the executing time of each query. Once one is over the threshold, |
| * it will be killed and return the time out exception. |
| */ |
| public class QueryTimeManager implements IService { |
| |
| private static final Logger logger = LoggerFactory.getLogger(QueryTimeManager.class); |
| |
| private Map<Long, QueryContext> queryContextMap; |
| |
| private ScheduledExecutorService executorService; |
| |
| private Map<Long, ScheduledFuture<?>> queryScheduledTaskMap; |
| |
| private QueryTimeManager() { |
| queryContextMap = new ConcurrentHashMap<>(); |
| queryScheduledTaskMap = new ConcurrentHashMap<>(); |
| executorService = IoTDBThreadPoolFactory.newScheduledThreadPool(1, "query-time-manager"); |
| } |
| |
| public void registerQuery(QueryContext context) { |
| queryContextMap.put(context.getQueryId(), context); |
| // Use the default configuration of server if a negative timeout |
| if (context.getTimeout() < 0) { |
| context.setTimeout(IoTDBDescriptor.getInstance().getConfig().getQueryTimeoutThreshold()); |
| } |
| if (context.getTimeout() != 0) { |
| // submit a scheduled task to judge whether query is still running after timeout |
| ScheduledFuture<?> scheduledFuture = |
| executorService.schedule( |
| () -> { |
| killQuery(context.getQueryId()); |
| logger.warn( |
| String.format( |
| "Query is time out (%dms) with queryId %d", |
| context.getTimeout(), context.getQueryId())); |
| }, |
| context.getTimeout(), |
| TimeUnit.MILLISECONDS); |
| queryScheduledTaskMap.put(context.getQueryId(), scheduledFuture); |
| } |
| } |
| |
| public void killQuery(long queryId) { |
| if (queryContextMap.get(queryId) == null) { |
| return; |
| } |
| queryContextMap.get(queryId).setInterrupted(true); |
| } |
| |
| /** |
| * UnRegister query when query quits because of getting enough data or timeout. If getting enough |
| * data, we only remove the timeout task. If the query is full quit because of timeout or |
| * EndQuery(), we remove them all. |
| * |
| * @param fullQuit True if timeout or endQuery() |
| */ |
| public AtomicBoolean unRegisterQuery(long queryId, boolean fullQuit) { |
| // This is used to make sure the QueryTimeoutRuntimeException is thrown once |
| AtomicBoolean successRemoved = new AtomicBoolean(false); |
| queryContextMap.computeIfPresent( |
| queryId, |
| (k, v) -> { |
| successRemoved.set(true); |
| ScheduledFuture<?> scheduledFuture = queryScheduledTaskMap.remove(queryId); |
| if (scheduledFuture != null) { |
| scheduledFuture.cancel(false); |
| } |
| SessionTimeoutManager.getInstance() |
| .refresh(SessionManager.getInstance().getSessionIdByQueryId(queryId)); |
| return fullQuit ? null : v; |
| }); |
| return successRemoved; |
| } |
| |
| /** |
| * Check given query is alive or not. We only throw the queryTimeoutRunTimeException once. If the |
| * runTimeException is thrown in main thread, it will quit directly while the return value will be |
| * used to ask sub query threads to quit. Else if it's thrown in one sub thread, other sub threads |
| * will quit by reading the return value, and main thread will catch and throw the same exception |
| * by reading the ExceptionBatchData. |
| * |
| * @return True if alive. |
| */ |
| public static boolean checkQueryAlive(long queryId) { |
| QueryContext queryContext = getInstance().getQueryContext(queryId); |
| if (queryContext == null) { |
| return false; |
| } else if (queryContext.isInterrupted()) { |
| if (getInstance().unRegisterQuery(queryId, true).get()) { |
| throw new QueryTimeoutRuntimeException(); |
| } |
| return false; |
| } |
| return true; |
| } |
| |
| public Map<Long, QueryContext> getQueryContextMap() { |
| return queryContextMap; |
| } |
| |
| public void clear() { |
| queryContextMap.clear(); |
| queryScheduledTaskMap.clear(); |
| } |
| |
| public QueryContext getQueryContext(long queryId) { |
| return queryContextMap.get(queryId); |
| } |
| |
| public static QueryTimeManager getInstance() { |
| return QueryTimeManagerHelper.INSTANCE; |
| } |
| |
| @Override |
| public void start() { |
| // Do Nothing |
| } |
| |
| @Override |
| public void stop() { |
| if (executorService == null || executorService.isShutdown()) { |
| return; |
| } |
| executorService.shutdownNow(); |
| } |
| |
| @Override |
| public ServiceType getID() { |
| return ServiceType.QUERY_TIME_MANAGER; |
| } |
| |
| private static class QueryTimeManagerHelper { |
| |
| private static final QueryTimeManager INSTANCE = new QueryTimeManager(); |
| |
| private QueryTimeManagerHelper() {} |
| } |
| } |