| /** |
| * 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.tez.runtime.common.resources; |
| |
| import java.text.DecimalFormat; |
| import java.util.List; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.tez.dag.api.TezConfiguration; |
| |
| import com.google.common.base.Function; |
| import org.apache.tez.common.Preconditions; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.Lists; |
| |
| @Public |
| @Unstable |
| public class ScalingAllocator implements InitialMemoryAllocator { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ScalingAllocator.class); |
| |
| private Configuration conf; |
| |
| @Override |
| public Iterable<Long> assignMemory(long availableForAllocation, int numTotalInputs, |
| int numTotalOutputs, Iterable<InitialMemoryRequestContext> requests) { |
| |
| int numRequests = 0; |
| long totalRequested = 0; |
| for (InitialMemoryRequestContext context : requests) { |
| totalRequested += context.getRequestedSize(); |
| numRequests++; |
| } |
| |
| // Take a certain amount of memory away for general usage. |
| double reserveFraction = conf.getDouble(TezConfiguration.TEZ_TASK_SCALE_MEMORY_RESERVE_FRACTION, |
| TezConfiguration.TEZ_TASK_SCALE_MEMORY_RESERVE_FRACTION_DEFAULT); |
| Preconditions.checkState(reserveFraction >= 0.0d && reserveFraction <= 1.0d); |
| availableForAllocation = (long) (availableForAllocation - (reserveFraction * availableForAllocation)); |
| |
| long totalJvmMem = Runtime.getRuntime().maxMemory(); |
| double ratio = totalRequested / (double) totalJvmMem; |
| LOG.info("Scaling Requests. TotalRequested: " + totalRequested + ", TotalJVMHeap: " |
| + totalJvmMem + ", TotalAvailable: " + availableForAllocation |
| + ", TotalRequested/TotalJVMHeap:" + new DecimalFormat("0.00").format(ratio)); |
| |
| if (totalRequested < availableForAllocation || totalRequested == 0) { |
| // Not scaling up requests. Assuming things were setup correctly by |
| // users in this case, keeping Processor, caching etc in mind. |
| return Lists.newArrayList(Iterables.transform(requests, |
| new Function<InitialMemoryRequestContext, Long>() { |
| public Long apply(InitialMemoryRequestContext requestContext) { |
| return requestContext.getRequestedSize(); |
| } |
| })); |
| } |
| |
| List<Long> allocations = Lists.newArrayListWithCapacity(numRequests); |
| for (InitialMemoryRequestContext request : requests) { |
| long requestedSize = request.getRequestedSize(); |
| if (requestedSize == 0) { |
| allocations.add(0l); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Scaling requested: 0 to allocated: 0"); |
| } |
| } else { |
| long allocated = (long) ((requestedSize / (double) totalRequested) * availableForAllocation); |
| allocations.add(allocated); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Scaling requested: " + requestedSize + " to allocated: " + allocated); |
| } |
| |
| } |
| } |
| return allocations; |
| } |
| |
| @Override |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return this.conf; |
| } |
| } |