| /* |
| * 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.drill.exec.work.foreman.rm; |
| |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.exec.ExecConstants; |
| import org.apache.drill.exec.ops.QueryContext; |
| import org.apache.drill.exec.server.DrillbitContext; |
| import org.apache.drill.exec.server.options.SystemOptionManager; |
| import org.apache.drill.exec.work.foreman.Foreman; |
| import org.apache.drill.exec.work.foreman.rm.DistributedQueryQueue.StatusAdapter; |
| |
| /** |
| * Wrapper around the default and/or distributed resource managers |
| * to allow dynamically enabling and disabling queueing. |
| */ |
| |
| public class DynamicResourceManager implements ResourceManager { |
| |
| private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(DynamicResourceManager.class); |
| |
| private final DrillbitContext context; |
| private ResourceManager defaultRm; |
| private ResourceManager queueingRm; |
| private ResourceManager activeRm; |
| public long nextUpdateTime; |
| public final int recheckDelayMs = 5000; |
| |
| public DynamicResourceManager(final DrillbitContext context) { |
| this.context = context; |
| refreshRM(); |
| } |
| |
| public synchronized ResourceManager activeRM() { |
| refreshRM(); |
| return activeRm; |
| } |
| |
| @Override |
| public long memoryPerNode() { |
| return activeRm.memoryPerNode(); |
| } |
| |
| @Override |
| public int cpusPerNode() { |
| return activeRm.cpusPerNode(); |
| } |
| |
| @Override |
| public synchronized QueryResourceAllocator newResourceAllocator(QueryContext queryContext) { |
| refreshRM(); |
| return activeRm.newResourceAllocator(queryContext); |
| } |
| |
| @Override |
| public synchronized QueryResourceManager newQueryRM(Foreman foreman) { |
| refreshRM(); |
| return activeRm.newQueryRM(foreman); |
| } |
| |
| private void refreshRM() { |
| long now = System.currentTimeMillis(); |
| if (now < nextUpdateTime) { |
| return; |
| } |
| nextUpdateTime = now + recheckDelayMs; |
| SystemOptionManager systemOptions = context.getOptionManager(); |
| if (systemOptions.getOption(ExecConstants.ENABLE_QUEUE)) { |
| if (queueingRm == null) { |
| StatusAdapter statusAdapter = new StatusAdapter() { |
| @Override |
| public boolean inShutDown() { |
| // Drill provides no shutdown state at present. |
| // TODO: Once DRILL-4286 (graceful shutdown) is merged, use the |
| // new Drillbit status to determine when the Drillbit |
| // is shutting down. |
| return false; |
| } |
| }; |
| queueingRm = new ThrottledResourceManager(context, |
| new DistributedQueryQueue(context, statusAdapter)); |
| } |
| if (activeRm != queueingRm) { |
| logger.debug("Enabling ZK-based query queue."); |
| activeRm = queueingRm; |
| } |
| } else { |
| if (defaultRm == null) { |
| defaultRm = new DefaultResourceManager(); |
| } |
| if (activeRm != defaultRm) { |
| logger.debug("Disabling ZK-based query queue."); |
| activeRm = defaultRm; |
| } |
| } |
| } |
| |
| @Override |
| public void close() { |
| RuntimeException ex = null; |
| try { |
| if (defaultRm != null) { |
| defaultRm.close(); |
| } |
| } catch (RuntimeException e) { |
| ex = e; |
| } finally { |
| defaultRm = null; |
| } |
| try { |
| if (queueingRm != null) { |
| queueingRm.close(); |
| } |
| } catch (RuntimeException e) { |
| ex = ex == null ? e : ex; |
| } finally { |
| queueingRm = null; |
| } |
| activeRm = null; |
| if (ex == null) { |
| return; |
| } else if (ex instanceof UserException) { |
| throw (UserException) ex; |
| } else { |
| throw UserException.systemError(ex) |
| .addContext("Failure closing resource managers.") |
| .build(logger); |
| } |
| } |
| } |