| /* |
| * 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.kylin.rest.util; |
| |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.kylin.common.KylinConfig; |
| import org.apache.kylin.metadata.project.ProjectInstance; |
| import org.apache.kylin.metadata.project.ProjectManager; |
| import org.apache.kylin.rest.exception.BadRequestException; |
| import org.apache.kylin.rest.msg.Message; |
| import org.apache.kylin.rest.msg.MsgPicker; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.kylin.shaded.com.google.common.cache.CacheBuilder; |
| import org.apache.kylin.shaded.com.google.common.cache.CacheLoader; |
| import org.apache.kylin.shaded.com.google.common.cache.LoadingCache; |
| import org.apache.kylin.shaded.com.google.common.cache.RemovalListener; |
| import org.apache.kylin.shaded.com.google.common.cache.RemovalNotification; |
| |
| public class QueryRequestLimits implements AutoCloseable { |
| private static final Logger logger = LoggerFactory.getLogger(QueryRequestLimits.class); |
| |
| private static LoadingCache<String, AtomicInteger> runningStats = CacheBuilder.newBuilder() |
| .removalListener(new RemovalListener<String, AtomicInteger>() { |
| @Override |
| public void onRemoval(RemovalNotification<String, AtomicInteger> notification) { |
| logger.info("Current running query number " + notification.getValue().get() + " for project " |
| + notification.getKey() + " is removed due to " + notification.getCause()); |
| } |
| }).expireAfterWrite(1, TimeUnit.DAYS).build(new CacheLoader<String, AtomicInteger>() { |
| @Override |
| public AtomicInteger load(String s) throws Exception { |
| return new AtomicInteger(0); |
| } |
| }); |
| |
| static boolean openQueryRequest(String project, int maxConcurrentQuery) { |
| if (maxConcurrentQuery == 0) { |
| return true; |
| } |
| try { |
| AtomicInteger nRunningQueries = runningStats.get(project); |
| for (;;) { |
| int nRunning = nRunningQueries.get(); |
| if (nRunning < maxConcurrentQuery) { |
| if (nRunningQueries.compareAndSet(nRunning, nRunning + 1)) { |
| return true; |
| } |
| } else { |
| return false; |
| } |
| } |
| } catch (ExecutionException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| static void closeQueryRequest(String project, int maxConcurrentQuery) { |
| if (maxConcurrentQuery == 0) { |
| return; |
| } |
| AtomicInteger nRunningQueries = runningStats.getIfPresent(project); |
| if (nRunningQueries != null) { |
| nRunningQueries.decrementAndGet(); |
| } |
| } |
| |
| public static Integer getCurrentRunningQuery(String project) { |
| AtomicInteger nRunningQueries = runningStats.getIfPresent(project); |
| if (nRunningQueries != null) { |
| return nRunningQueries.get(); |
| } else { |
| return null; |
| } |
| } |
| |
| // ============================================================================ |
| |
| final private String project; |
| final private int maxConcurrentQuery; |
| |
| public QueryRequestLimits(String project) { |
| this.project = project; |
| |
| ProjectManager mgr = ProjectManager.getInstance(KylinConfig.getInstanceFromEnv()); |
| ProjectInstance prj = mgr.getProject(project); |
| this.maxConcurrentQuery = prj.getConfig().getQueryConcurrentRunningThresholdForProject(); |
| |
| boolean ok = openQueryRequest(project, maxConcurrentQuery); |
| if (!ok) { |
| Message msg = MsgPicker.getMsg(); |
| logger.warn("Directly return exception as too many concurrent query requests for project: {}", project); |
| throw new BadRequestException(msg.getQUERY_TOO_MANY_RUNNING()); |
| } |
| } |
| |
| @Override |
| public void close() { |
| closeQueryRequest(project, maxConcurrentQuery); |
| } |
| } |